E63S Wagon lots of codes- power supply and check engine light
04-04-2023, 05:06 PM
#26
Junior Member
Thread Starter
drive around and look up the battery sensor values lives. It will be fun if you get to understand the meaning of these measures.
If you see voltage below 12.3 V :
stop driving ASAP!
Find a safe place to park.
Your car needs a reboot now...
Stop the engine ignition (Exit car if convenient)
LOCK the car for it to enter low-power sleep mode...
10mn later resume traveling ✌️
Use headlights:ON to generate a fixed voltage
The car VIP modules on CAN-C got in a jam.
ECU picked up corrupted/missing data that it disliked.
Diagnosing this soft-crash with field tools was a tall challenge ✌️
MB introduced a bug in the BOSCH ECU:
The ECU controlling the alternator output on M276/8 has a potentially costly firmware issue.
Under common conditions the ECU erroneous control causes low voltage disfunctions, batteries and charging system failures.
The fix is a simple 5mn software contribution that I wish i could test...
If you see voltage below 12.3 V :
stop driving ASAP!
Find a safe place to park.
Your car needs a reboot now...
Stop the engine ignition (Exit car if convenient)
LOCK the car for it to enter low-power sleep mode...
10mn later resume traveling ✌️
Use headlights:ON to generate a fixed voltage
The car VIP modules on CAN-C got in a jam.
ECU picked up corrupted/missing data that it disliked.
Diagnosing this soft-crash with field tools was a tall challenge ✌️
MB introduced a bug in the BOSCH ECU:
The ECU controlling the alternator output on M276/8 has a potentially costly firmware issue.
Under common conditions the ECU erroneous control causes low voltage disfunctions, batteries and charging system failures.
The fix is a simple 5mn software contribution that I wish i could test...
04-04-2023, 07:00 PM
#27
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MY'14 W212 M276 3.5NA @55kMi
14.4V is a nice working voltage. The variation between .3 and .6 is not significant. It's the battery sensor that measures precisely how well ECU maintains its voltage control under a 50Amps total load.
No problemo
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chassis (04-05-2023)
04-05-2023, 07:58 AM
#29
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chassis (04-05-2023)
04-05-2023, 10:10 AM
#31
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2017 GLE350 4MATIC
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CaliBenzDriver (04-07-2023)
04-05-2023, 02:00 PM
#32
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MY'14 W212 M276 3.5NA @55kMi
dealer quick inspection
With the voltage issues reported by OP, I don't see the "oil in harness" tale tale signs (timing misfires) -
Simply inspect the connectors or ask for job estimate not a bad idea... but after OP fixed!
-- 4 connectors of VVT solenoid actuators
-- 4 connectors Camshaft sensors
These parts routinely leak oil into the engine harness anyway.
Let's see how fast dealer gets it on the road.
🤞
Simply inspect the connectors or ask for job estimate not a bad idea... but after OP fixed!
-- 4 connectors of VVT solenoid actuators
-- 4 connectors Camshaft sensors
These parts routinely leak oil into the engine harness anyway.
Let's see how fast dealer gets it on the road.
🤞
Last edited by CaliBenzDriver; 04-05-2023 at 06:31 PM.
04-07-2023, 02:41 PM
#33
Junior Member
Thread Starter
With the voltage issues reported by OP, I don't see the "oil in harness" tale tale signs (timing misfires) -
Simply inspect the connectors or ask for job estimate not a bad idea... but after OP fixed!
-- 4 connectors of VVT solenoid actuators
-- 4 connectors Camshaft sensors
These parts routinely leak oil into the engine harness anyway.
Let's see how fast dealer gets it on the road.
🤞
Simply inspect the connectors or ask for job estimate not a bad idea... but after OP fixed!
-- 4 connectors of VVT solenoid actuators
-- 4 connectors Camshaft sensors
These parts routinely leak oil into the engine harness anyway.
Let's see how fast dealer gets it on the road.
🤞
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juanmor40 (04-07-2023)
04-07-2023, 04:47 PM
#34
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MY'14 W212 M276 3.5NA @55kMi
The Mercedes dealer was excellent and for $245 told me the issue was a loose connector to the fuse box on the drivers side of the engine bay. Not sure how it came loose but that was the fix and all is good now. Thanks for everyone’s input. I will happily spend that for this fix as there could have been so many other things it seems.
Have them inspect the VVT oil leak situation before it has a chance to flod your harness with engine oil. Replace cam sensors and install pigtails for security.
Last edited by CaliBenzDriver; 04-07-2023 at 11:25 PM.
