Check Engine light after replacing the voltage regulator
Thread Starter
Member
Joined: May 2014
Posts: 214
Likes: 3
From: Lebanon
2009 C350
Check Engine light after replacing the voltage regulator
Hello folks, i have a c230k 2005, 2 days ago the alternator/battery flashed red when i first started up the engine at morning.The error went after driving for around 15.000Km,everything seemed normal.Next day i went to check on the Alternator and was told to replace the voltage regulator as a first step before replacing the whole alternator.
After installing a new VR, the check engine light came on and the car lost most of its power when driving it, it became so slow but weird thing was that everything was running good, such as lights, radio,etc...checked the alternator voltage and it was running fine, around 13.5V , the next day i had to scan it and the scanner came with an overvoltage error as i recall.Right now, i have no idea what to do? replace the whole valeo alternator and get a new Bosch one? or maybe the problem moved somewhere else , i.e. Kompressor? im in real need of help here.
After installing a new VR, the check engine light came on and the car lost most of its power when driving it, it became so slow but weird thing was that everything was running good, such as lights, radio,etc...checked the alternator voltage and it was running fine, around 13.5V , the next day i had to scan it and the scanner came with an overvoltage error as i recall.Right now, i have no idea what to do? replace the whole valeo alternator and get a new Bosch one? or maybe the problem moved somewhere else , i.e. Kompressor? im in real need of help here.
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Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
These cars are extremely voltage sensitive.
First thing to check. Did you fit the correct VR for your VIN?
There are 3 different VR types these days.
There are 3 variants:
MFR (multi function regulators)
LIN (local interconnect bus)
BSS (bit synchronous bus)
BSS and LIN are used depending on the engine ECU type
either ME2.8 or SIM4, these regulators actually communicate with the engine ecu and transfer information between each other, the engine ecu has control over the alternator to be able to control the torque loading for emissions requirments. Especially during warm up.
So you cannot swap an alternator with a BSS regulator with one with say a LIN bus. No communication or faulty communication will take place.
First thing to check. Did you fit the correct VR for your VIN?
There are 3 different VR types these days.
There are 3 variants:
MFR (multi function regulators)
LIN (local interconnect bus)
BSS (bit synchronous bus)
BSS and LIN are used depending on the engine ECU type
either ME2.8 or SIM4, these regulators actually communicate with the engine ecu and transfer information between each other, the engine ecu has control over the alternator to be able to control the torque loading for emissions requirments. Especially during warm up.
So you cannot swap an alternator with a BSS regulator with one with say a LIN bus. No communication or faulty communication will take place.
Thread Starter
Member
Joined: May 2014
Posts: 214
Likes: 3
From: Lebanon
2009 C350
These cars are extremely voltage sensitive.
First thing to check. Did you fit the correct VR for your VIN?
There are 3 different VR types these days.
There are 3 variants:
MFR (multi function regulators)
LIN (local interconnect bus)
BSS (bit synchronous bus)
BSS and LIN are used depending on the engine ECU type
either ME2.8 or SIM4, these regulators actually communicate with the engine ecu and transfer information between each other, the engine ecu has control over the alternator to be able to control the torque loading for emissions requirments. Especially during warm up.
So you cannot swap an alternator with a BSS regulator with one with say a LIN bus. No communication or faulty communication will take place.
First thing to check. Did you fit the correct VR for your VIN?
There are 3 different VR types these days.
There are 3 variants:
MFR (multi function regulators)
LIN (local interconnect bus)
BSS (bit synchronous bus)
BSS and LIN are used depending on the engine ECU type
either ME2.8 or SIM4, these regulators actually communicate with the engine ecu and transfer information between each other, the engine ecu has control over the alternator to be able to control the torque loading for emissions requirments. Especially during warm up.
So you cannot swap an alternator with a BSS regulator with one with say a LIN bus. No communication or faulty communication will take place.
Thread Starter
Member
Joined: May 2014
Posts: 214
Likes: 3
From: Lebanon
2009 C350
MBWorld Fanatic!
Joined: Dec 2006
Posts: 1,105
Likes: 11
From: Toronto, Canada
2019 C300 Wagon; '75 Triumph TR6; previous: 2004 C230 6spd sold after 17 years of driving
I bought my VR from the link below for my 2004 c230 for about $56 at the time (it was $205 at the dealer in Canada) and had no issues it has been running for 4 years now. It is an OEM Valeo component.
http://americanenginesco.com/
There are 2 versions (I bought the first one)
http://www.americanenginesco.com/mer...-sg12b062-oem/
http://www.americanenginesco.com/mer...leo-oe-593395/
http://americanenginesco.com/
There are 2 versions (I bought the first one)
http://www.americanenginesco.com/mer...-sg12b062-oem/
http://www.americanenginesco.com/mer...leo-oe-593395/
Last edited by Boom vang; Aug 26, 2014 at 10:51 AM.
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