Pressure in the fuel low pressure circuit, is too high.
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Joined: Jan 2017
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From: Ventura County, California.
2010 E350
Pressure in the fuel low pressure circuit, is too high.
Hello, My 2010 E350 is giving a few codes, there is no check engine light on, I hook up OBD scanner "BlueDriver" because I have hearing a high pitch noise for a while now on the left rear area of car, the car start and runs good, as always, I have not notice any abnormal symptom.
Codes are:
P0628 Fuel pump "A" control circuit low
P008B Low pressure fuel system pressure - too high
The above 2 codes appear as Confirmed codes and Pending codes as well
The following 2 codes in the scanner reads: 2 ME - Motor electronics "ME97" for combustion engine "M272" (N3/10) codes
P2145 Status PRESENT - The output for the fuel pump has a short circuit to ground
P2269 Status PRESENT - The pressure in the low pressure circuit is too high
The following code in the scanner reads: - FSCU - control unit "fuel pump" (N118) code
P0629 Status CONFIRMED -
I removed the rear seat and fuel pump cover and took a short video. I will try to uploaded because I haven't done that before, hope someone can guide me to fix my car issues, thank you in advance.
Codes are:
P0628 Fuel pump "A" control circuit low
P008B Low pressure fuel system pressure - too high
The above 2 codes appear as Confirmed codes and Pending codes as well
The following 2 codes in the scanner reads: 2 ME - Motor electronics "ME97" for combustion engine "M272" (N3/10) codes
P2145 Status PRESENT - The output for the fuel pump has a short circuit to ground
P2269 Status PRESENT - The pressure in the low pressure circuit is too high
The following code in the scanner reads: - FSCU - control unit "fuel pump" (N118) code
P0629 Status CONFIRMED -
I removed the rear seat and fuel pump cover and took a short video. I will try to uploaded because I haven't done that before, hope someone can guide me to fix my car issues, thank you in advance.
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
HIGH LOW PRESSURE
Hello, My 2010 E350 is giving a few codes, there is no check engine light on, I hook up OBD scanner "BlueDriver" because I have hearing a high pitch noise for a while now on the left rear area of car, the car start and runs good, as always, I have not notice any abnormal symptom.
Codes are:
P0628 Fuel pump "A" control circuit low
P008B Low pressure fuel system pressure - too high
The above 2 codes appear as Confirmed codes and Pending codes as well
The following 2 codes in the scanner reads: 2 ME - Motor electronics "ME97" for combustion engine "M272" (N3/10) codes
P2145 Status PRESENT - The output for the fuel pump has a short circuit to ground
P2269 Status PRESENT - The pressure in the low pressure circuit is too high
The following code in the scanner reads: - FSCU - control unit "fuel pump" (N118) code
P0629 Status CONFIRMED -
I removed the rear seat and fuel pump cover and took a short video. I will try to uploaded because I haven't done that before, hope someone can guide me to fix my car issues, thank you in advance.
Codes are:
P0628 Fuel pump "A" control circuit low
P008B Low pressure fuel system pressure - too high
The above 2 codes appear as Confirmed codes and Pending codes as well
The following 2 codes in the scanner reads: 2 ME - Motor electronics "ME97" for combustion engine "M272" (N3/10) codes
P2145 Status PRESENT - The output for the fuel pump has a short circuit to ground
P2269 Status PRESENT - The pressure in the low pressure circuit is too high
The following code in the scanner reads: - FSCU - control unit "fuel pump" (N118) code
P0629 Status CONFIRMED -
I removed the rear seat and fuel pump cover and took a short video. I will try to uploaded because I haven't done that before, hope someone can guide me to fix my car issues, thank you in advance.
How many Psi are we practically talking about here?
Normally tank pump fail with reduced pressure, this is Mercedes.
The question is what's causing this to happen? (FSCU vs. PmP)
Two telling faults...:
P2145: The output for the fuel pump has a short circuit to ground
P0628: Fuel pump "A" control circuit low
Try to rule out controller module to focus on tank pump unit.
Last edited by CaliBenzDriver; Jul 13, 2025 at 11:42 PM.
Thread Starter
Junior Member
Joined: Jan 2017
Posts: 20
Likes: 5
From: Ventura County, California.
2010 E350
You have this issue well cornered
How many Psi are we practically talking about here?
Normally tank pump fail with reduced pressure, this is Mercedes.
The question is what's causing this to happen? (FSCU vs. PmP)
Two telling faults...:
P2145: The output for the fuel pump has a short circuit to ground
P0628: Fuel pump "A" control circuit low
Try to rule out controller module to focus on tank pump unit.
How many Psi are we practically talking about here?
Normally tank pump fail with reduced pressure, this is Mercedes.
The question is what's causing this to happen? (FSCU vs. PmP)
Two telling faults...:
P2145: The output for the fuel pump has a short circuit to ground
P0628: Fuel pump "A" control circuit low
Try to rule out controller module to focus on tank pump unit.
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Thank you for taking the time to replay, I'm not a mechanic but I do work on my cars so I'll do my best, when you said "Try to rule out controller module to focus on tank pump unit" you mean check the FSCU which is something also called N118? if so, can you point me in the direction of how to test it please.
You can read pump data by looking at scanner live data : pressure
Do inspect wiring connections if you known how to clear faults.
Last edited by CaliBenzDriver; Jul 14, 2025 at 08:11 PM.
Thread Starter
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Joined: Jan 2017
Posts: 20
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From: Ventura County, California.
2010 E350
Ok, according live data from BlueDriver OBD scanner, fuel pressure at rail fluctuates from 95.7 to 101.5 Psi which equals 6.59 to 6.99 Bar.
Also, I cleared codes with the scanner and also disconnect battery for about an hour, then reconnect battery and went for a 45 miles drive with a couple stops to get things, arrive back home and check for codes again, scanner found the following:
P0628 Fuel pump "A" control circuit low
P008B Low pressure fuel system pressure - too high
The above 2 codes appear as Confirmed codes and Pending codes as well
2 ME - Motor electronics "ME97" for combustion engine "M272" (N3/10) codes
P2145 Status PRESENT - The output for the fuel pump has a short circuit to ground
P2269 Status PRESENT - The pressure in the low pressure circuit is too high
New scanner results are almost identical to my first post but the last code P0629 about FSCU does not show up any more, so that rule out the fuel pump control module? Any other advise from here?
Like I mention at the beginning, the car runs and drives great, as always, but even check engine light is not ON car will not pass smog test because of this codes.
Also, I cleared codes with the scanner and also disconnect battery for about an hour, then reconnect battery and went for a 45 miles drive with a couple stops to get things, arrive back home and check for codes again, scanner found the following:
P0628 Fuel pump "A" control circuit low
P008B Low pressure fuel system pressure - too high
The above 2 codes appear as Confirmed codes and Pending codes as well
2 ME - Motor electronics "ME97" for combustion engine "M272" (N3/10) codes
P2145 Status PRESENT - The output for the fuel pump has a short circuit to ground
P2269 Status PRESENT - The pressure in the low pressure circuit is too high
New scanner results are almost identical to my first post but the last code P0629 about FSCU does not show up any more, so that rule out the fuel pump control module? Any other advise from here?
Like I mention at the beginning, the car runs and drives great, as always, but even check engine light is not ON car will not pass smog test because of this codes.
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
TESTING PUMP VS. MODULE
Ok, according live data from BlueDriver OBD scanner, fuel pressure at rail fluctuates from 95.7 to 101.5 Psi which equals 6.59 to 6.99 Bar.
Also, I cleared codes with the scanner and also disconnect battery for about an hour, then reconnect battery and went for a 45 miles drive with a couple stops to get things, arrive back home and check for codes again, scanner found the following:
P0628 Fuel pump "A" control circuit low
P008B Low pressure fuel system pressure - too high
The above 2 codes appear as Confirmed codes and Pending codes as well
2 ME - Motor electronics "ME97" for combustion engine "M272" (N3/10) codes
P2145 Status PRESENT - The output for the fuel pump has a short circuit to ground
P2269 Status PRESENT - The pressure in the low pressure circuit is too high
New scanner results are almost identical to my first post but the last code P0629 about FSCU does not show up any more, so that rule out the fuel pump control module? Any other advise from here?
Like I mention at the beginning, the car runs and drives great, as always, but even check engine light is not ON car will not pass smog test because of this codes.
Also, I cleared codes with the scanner and also disconnect battery for about an hour, then reconnect battery and went for a 45 miles drive with a couple stops to get things, arrive back home and check for codes again, scanner found the following:
P0628 Fuel pump "A" control circuit low
P008B Low pressure fuel system pressure - too high
The above 2 codes appear as Confirmed codes and Pending codes as well
2 ME - Motor electronics "ME97" for combustion engine "M272" (N3/10) codes
P2145 Status PRESENT - The output for the fuel pump has a short circuit to ground
P2269 Status PRESENT - The pressure in the low pressure circuit is too high
New scanner results are almost identical to my first post but the last code P0629 about FSCU does not show up any more, so that rule out the fuel pump control module? Any other advise from here?
Like I mention at the beginning, the car runs and drives great, as always, but even check engine light is not ON car will not pass smog test because of this codes.
You do have high low-pressure !
One of the pump AC channel is bad:
from the pump windings or
from the MOSFET driver or
from the harness connector
Use your DVM on AC voltage to compare live voltage at pump connector across the 3 largest wires.
Scanner should also show current.
This should confirm unbalanced pump: Y/N
Next step... pump side:
unplug pump connector and using OHMETER check the windings ohm value.
if one winding is out of range (high/low) pump is bad
else it's the Mosfet driver.
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Thread Starter
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From: Ventura County, California.
2010 E350
Here you can see pictures of fuel pump under passenger side of rear seat.
As soon as the ignition switch is turn ON but not cranking engine (when all dash lights light up) voltage from 2 thick wires disconnected from pump measure 12.3 volts for 2 seconds then gradually goes to "0" in the next 2-3 seconds.
I check for continuity from the 2 wide (spade) connectors at the fuel pump and sure there is continuity.
I also check for ohms in the same 2 wide connectors at pump and it shows fluctuation between 00.4 - 00.1
The other 2 thinner cables show nothing, the 2 little round pin like connector at pump have no continuity but measure .484 ohms.
I hope I did everything correctly
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Out Of Control!!
Joined: Apr 2019
Posts: 11,921
Likes: 6,775
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
HIGH LOW-PRESSURE
Here you can see pictures of fuel pump under passenger side of rear seat.
As soon as the ignition switch is turn ON but not cranking engine (when all dash lights light up) voltage from 2 thick wires disconnected from pump measure 12.3 volts for 2 seconds then gradually goes to "0" in the next 2-3 seconds.
I check for continuity from the 2 wide (spade) connectors at the fuel pump and sure there is continuity.
I also check for ohms in the same 2 wide connectors at pump and it shows fluctuation between 00.4 - 00.1
The other 2 thinner cables show nothing, the 2 little round pin like connector at pump have no continuity but measure .484 ohms.
I hope I did everything correctly
You have a conventional 12V-DC Pump (not a 3-phase AC motor)
Good pump ohm
good clean connector
good voltage source
Then what's wrong... bad pressure sensor?
I dont know exactly how your low-pressure is regulated. Normally it's a simple "ball on spring" return inside the tank.
Here it must be different, like Pulse Width Modulation (PWM) to slow down DC pump Based on sensor feedback.
Lets scrutinize goofy Module control:
see what live data look out of line.
Thread Starter
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Joined: Jan 2017
Posts: 20
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From: Ventura County, California.
2010 E350
Live data in my BlueDriver scanner doesn't show a lot about fuel.
It shows: Fuel rail pressure and fuel system status.
The pump makes a whining noise, I have this car since new, fuel pump and filter have never been replaced, car has 62,978 miles
Does this car has fuel pressure regulator?
What would you (or others) suggest to check next?
It shows: Fuel rail pressure and fuel system status.
The pump makes a whining noise, I have this car since new, fuel pump and filter have never been replaced, car has 62,978 miles
Does this car has fuel pressure regulator?
What would you (or others) suggest to check next?
Out Of Control!!
Joined: Apr 2019
Posts: 11,921
Likes: 6,775
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Live data in my BlueDriver scanner doesn't show a lot about fuel.
It shows: Fuel rail pressure and fuel system status.
The pump makes a whining noise, I have this car since new, fuel pump and filter have never been replaced, car has 62,978 miles
Does this car has fuel pressure regulator?
What would you (or others) suggest to check next?
It shows: Fuel rail pressure and fuel system status.
The pump makes a whining noise, I have this car since new, fuel pump and filter have never been replaced, car has 62,978 miles
Does this car has fuel pressure regulator?
What would you (or others) suggest to check next?
You're getting 100Psi... with expected around 65Psi.
Read the live data directly from FSCU Module. It may help you understand what's happening regarding the pressure sensor.
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
(Not so much Autel nor Icarsoft)
available all over Internet
Thread Starter
Junior Member
Joined: Jan 2017
Posts: 20
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From: Ventura County, California.
2010 E350
I received the new scanner, Launch creader elite 2.0 for Mercedes Benz.
It shows 3 codes, same as my BlueDriver scanner
ECM - Engine Control Module (ME)
2145 The output for the fuel pump has a short circuit to ground
2269 The pressure in the low pressure circuit is too high
FSCU - control unit "fuel pump" (N118) code
062900 The output for the fuel pump has a short circuit to positive
Checking live data from FSCU shows:
Live data Qty (6)
Battery Voltage 14.30V
Fuel Pressure 7.95bar
Inside Temperature Of Control Unit 48degree C
Request Of Component 'M3 (Fuel Pump)' By Control Unit 'N3/9 (CDI Control Unit)' ON
Status Of Circuit 15 ON
Status Of Fuel Pump ON
What do you think? @CaliBenzDriver
It shows 3 codes, same as my BlueDriver scanner
ECM - Engine Control Module (ME)
2145 The output for the fuel pump has a short circuit to ground
2269 The pressure in the low pressure circuit is too high
FSCU - control unit "fuel pump" (N118) code
062900 The output for the fuel pump has a short circuit to positive
Checking live data from FSCU shows:
Live data Qty (6)
Battery Voltage 14.30V
Fuel Pressure 7.95bar
Inside Temperature Of Control Unit 48degree C
Request Of Component 'M3 (Fuel Pump)' By Control Unit 'N3/9 (CDI Control Unit)' ON
Status Of Circuit 15 ON
Status Of Fuel Pump ON
What do you think? @CaliBenzDriver
Out Of Control!!
Joined: Apr 2019
Posts: 11,921
Likes: 6,775
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
PROGRESS TOWARDS FSCU
I received the new scanner, Launch creader elite 2.0 for Mercedes Benz.
It shows 3 codes, same as my BlueDriver scanner
ECM - Engine Control Module (ME)
2145 The output for the fuel pump has a short circuit to ground
2269 The pressure in the low pressure circuit is too high
FSCU - control unit "fuel pump" (N118) code
062900 The output for the fuel pump has a short circuit to positive
Checking live data from FSCU shows:
Live data Qty (6)
Battery Voltage 14.30V
Fuel Pressure 7.95bar
Inside Temperature Of Control Unit 48degree C
Request Of Component 'M3 (Fuel Pump)' By Control Unit 'N3/9 (CDI Control Unit)' ON
Status Of Circuit 15 ON
Status Of Fuel Pump ON
What do you think? @CaliBenzDriver
It shows 3 codes, same as my BlueDriver scanner
ECM - Engine Control Module (ME)
2145 The output for the fuel pump has a short circuit to ground
2269 The pressure in the low pressure circuit is too high
FSCU - control unit "fuel pump" (N118) code
062900 The output for the fuel pump has a short circuit to positive
Checking live data from FSCU shows:
Live data Qty (6)
Battery Voltage 14.30V
Fuel Pressure 7.95bar
Inside Temperature Of Control Unit 48degree C
Request Of Component 'M3 (Fuel Pump)' By Control Unit 'N3/9 (CDI Control Unit)' ON
Status Of Circuit 15 ON
Status Of Fuel Pump ON
What do you think? @CaliBenzDriver
At least now we have live evidence and data from FSCU.
Can we get a visual on your FSCU Circuit board ?
Based on all the above thread, I would not be surprised to see the control MOSFET shorted through. Such as charcoaled PCB / MOSFET... (new module likely).
Can you hear the pump running as soon as the chassis wakes up either door open or key position-1?
+++ SHUT OFF car or disconnect BATTs then
- unplug FSCU module
- strip plastic enclosure open
- inspect board for defective components or failed/missing solderings
- post PCB pics for feedback
- (Clear faults after reinstalling)
If MOSFET got shorted
then your good for a new fuel filter + FSCU module.
Dirty filter drive up current that blows up undersized MOSFET.
Instead of failing with dead pump: "you walk"
this system fails high-pressure: "you drive home".
In Canada -40F Winter this feature can be life instead of death.
The wrong thing would be to ignore why this system was asking for service with high-Amps: plugged filter!
Static pressure can go up to 115Psi that's with very little flow through fuel demand.
Last edited by CaliBenzDriver; Jul 18, 2025 at 11:19 PM.
Thread Starter
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From: Ventura County, California.
2010 E350
I open the FSCU and I found some kind of mold, look at pictures, I clean it really well with a toothpick and Clorox wipes, after clean it up it doesn't look like it's fried, what do you think?
And to answer your questions, I can hear the fuel pump only when I turn ignition to second position.
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
WATER SOAKED FSCU
I open the FSCU and I found some kind of mold, look at pictures, I clean it really well with a toothpick and Clorox wipes, after clean it up it doesn't look like it's fried, what do you think?
And to answer your questions, I can hear the fuel pump only when I turn ignition to second position.
Fix the water source to prevent repeats offense.
IGN-2 Pump should time out after 15.Seconds or less....not run non-stop!
You may get lucky cleaning the circuit board - It does not look real bad: 70/30 chances.
🤞
Last edited by CaliBenzDriver; Jul 19, 2025 at 01:06 AM.
Thread Starter
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Joined: Jan 2017
Posts: 20
Likes: 5
From: Ventura County, California.
2010 E350
Good job: there you have it! Your FSCU got soaked...
Fix the water source to prevent repeats offense.
IGN-2 Pump should time out after 15.Seconds or less....not run non-stop!
You may get lucky cleaning the circuit board - It does not look real bad: 70/30 chances.
🤞
Fix the water source to prevent repeats offense.
IGN-2 Pump should time out after 15.Seconds or less....not run non-stop!
You may get lucky cleaning the circuit board - It does not look real bad: 70/30 chances.
🤞
I forgot to disconnect battery before disconnecting FSCU, tomorrow morning I will connect it back to check for codes again, should I disconnect battery before reconnecting FSCU?
Also is there a way to some how test FSCU to find out if it's good or bad?
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
NEXT... SCAN AGAIN
Yes when I turn ignition to number 2, fuel pump time out in about 5 seconds
I forgot to disconnect battery before disconnecting FSCU, tomorrow morning I will connect it back to check for codes again, should I disconnect battery before reconnecting FSCU?
Also is there a way to some how test FSCU to find out if it's good or bad?
I forgot to disconnect battery before disconnecting FSCU, tomorrow morning I will connect it back to check for codes again, should I disconnect battery before reconnecting FSCU?
Also is there a way to some how test FSCU to find out if it's good or bad?
Once you reconnect FSCU, Power up, clear fault
what comes back will then be current faults.
Lets see what faults remain - Based on that will be next step.
I think you can save your FSCU settings to reprogram a replacement if needed.
Last edited by CaliBenzDriver; Jul 19, 2025 at 01:35 AM.
Thread Starter
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From: Ventura County, California.
2010 E350
Ok, after FSCU was cleaned I disconnect battery, connect FSCU, reconnect battery, clear all codes, run scanner and I'm getting the same 3 codes. 
I think I need to order a new FSCU, just to clear this in my mind, FSCU code reads :
**FSCU - control unit "fuel pump" (N118) code
062900 The output for the fuel pump has a short circuit to positive**
So it means the output of the actual FSCU is the problem? not the output of the fuel pump, right?
It may look pretty obvious but just want to make sure I understand it
I think I need to order a new FSCU, just to clear this in my mind, FSCU code reads :
**FSCU - control unit "fuel pump" (N118) code
062900 The output for the fuel pump has a short circuit to positive**
So it means the output of the actual FSCU is the problem? not the output of the fuel pump, right?
It may look pretty obvious but just want to make sure I understand it
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Joined: Apr 2019
Posts: 11,921
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
REPLACEMENT CIRCUIT PROTECTION
Ok, after FSCU was cleaned I disconnect battery, connect FSCU, reconnect battery, clear all codes, run scanner and I'm getting the same 3 codes.
I think I need to order a new FSCU, just to clear this in my mind, FSCU code reads :
**FSCU - control unit "fuel pump" (N118) code
062900 The output for the fuel pump has a short circuit to positive**
So it means the output of the actual FSCU is the problem? not the output of the fuel pump, right?
It may look pretty obvious but just want to make sure I understand it
I think I need to order a new FSCU, just to clear this in my mind, FSCU code reads :
**FSCU - control unit "fuel pump" (N118) code
062900 The output for the fuel pump has a short circuit to positive**
So it means the output of the actual FSCU is the problem? not the output of the fuel pump, right?
It may look pretty obvious but just want to make sure I understand it
At least pump is kept running and control module responds to network but its functions are impacted... module is nearly junk.
This FSCU runs directly on VIP engine CAN-Bus. It must be reliable on its best behavior to prevent aggravating ECU/TCU networking delays.
You may want to brush on a layer of protective coating on your new/used replacement module. This will help prevent failures besides finding the water source that caused damages.
Thread Starter
Junior Member
Joined: Jan 2017
Posts: 20
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From: Ventura County, California.
2010 E350
I will order it Monday, they are closed right now, I was looking around and I think this is the right part https://www.mbpartsource.com/oem-par...mplete-9006207.
Do you think this Launch scanner can reprogram the new FSCU?
Do you think this Launch scanner can reprogram the new FSCU?
Out Of Control!!
Joined: Apr 2019
Posts: 11,921
Likes: 6,775
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
I will order it Monday, they are closed right now, I was looking around and I think this is the right part https://www.mbpartsource.com/oem-par...mplete-9006207.
Do you think this Launch scanner can reprogram the new FSCU?
Do you think this Launch scanner can reprogram the new FSCU?
It may not need any programming to run!
Look at the options towards screen bottom presented once you select the module.
Last edited by CaliBenzDriver; Jul 19, 2025 at 03:53 PM.
Thread Starter
Junior Member
Joined: Jan 2017
Posts: 20
Likes: 5
From: Ventura County, California.
2010 E350
@CaliBenzDriver You Are The Man!!!!
Problem fixed!!
I received the FSCU module yesterday and proceed to install it, but first using this Launch Creader Elite 2.0 MB scanner, I back up coding from old FSCU then disconnect battery, replace FSCU, reconnect battery, restore coding, clear all codes with scanner, run scanner again and no more codes.
I drove the car for a few miles this morning, when I got home connect scanner again and no codes.
Checking live data, fuel rail pressure now shows 57 psi.
Problem fixed!!
I received the FSCU module yesterday and proceed to install it, but first using this Launch Creader Elite 2.0 MB scanner, I back up coding from old FSCU then disconnect battery, replace FSCU, reconnect battery, restore coding, clear all codes with scanner, run scanner again and no more codes.
I drove the car for a few miles this morning, when I got home connect scanner again and no codes.
Checking live data, fuel rail pressure now shows 57 psi.
