Do I need a new ECM?
Thread Starter
Newbie
Joined: May 2015
Posts: 2
Likes: 0
2006 ML350
Do I need a new ECM?
Hi folks
My check engine light came on and I got the following codes:
0228 - M16/6 (Throttle valve actuator) Throttle valve jamming (iced up) P0638
1337 - Alternator serial interface
0217 - Throttle Valve stiff P2176
0569 - G3/3 (left O2 sensor before TWC KAT) Voltage is too high P2240
So I got a new alternator, a new throttle valve and 4 new O2 sensors. Cleared the codes, reset the ECU and the codes still appear. Other weird things are happening - one headlight turns off when I turn; dashboard says number plate light is blown, but it's not; same thing with park light; auto side mirror sometimes works.
Mechanic says that ECU is bad. Read in this forum (SunnyRayToronto sounds very knowledgeable!) that ECU's don't go bad like that and it may be something else. Car runs normally.
Could it be that I have a bad ECU? or do I just have several problems... will CRC contact cleaner work?
My check engine light came on and I got the following codes:
0228 - M16/6 (Throttle valve actuator) Throttle valve jamming (iced up) P0638
1337 - Alternator serial interface
0217 - Throttle Valve stiff P2176
0569 - G3/3 (left O2 sensor before TWC KAT) Voltage is too high P2240
So I got a new alternator, a new throttle valve and 4 new O2 sensors. Cleared the codes, reset the ECU and the codes still appear. Other weird things are happening - one headlight turns off when I turn; dashboard says number plate light is blown, but it's not; same thing with park light; auto side mirror sometimes works.
Mechanic says that ECU is bad. Read in this forum (SunnyRayToronto sounds very knowledgeable!) that ECU's don't go bad like that and it may be something else. Car runs normally.
Could it be that I have a bad ECU? or do I just have several problems... will CRC contact cleaner work?
Junior Member
Joined: Nov 2015
Posts: 25
Likes: 2
2007 e280 avantgarde
w211 2007 e280 presented with symptoms and faults as above later with battery warning then after changing the alternator developed electrical gremlins including blinking light batterry warning ac shutting off srs esp abs cruise control errors culprit central gateway module
Senior Member
Joined: Aug 2018
Posts: 309
Likes: 61
S350 2008
Hi folks
My check engine light came on and I got the following codes:
0228 - M16/6 (Throttle valve actuator) Throttle valve jamming (iced up) P0638
1337 - Alternator serial interface
0217 - Throttle Valve stiff P2176
0569 - G3/3 (left O2 sensor before TWC KAT) Voltage is too high P2240
So I got a new alternator, a new throttle valve and 4 new O2 sensors. Cleared the codes, reset the ECU and the codes still appear. Other weird things are happening - one headlight turns off when I turn; dashboard says number plate light is blown, but it's not; same thing with park light; auto side mirror sometimes works.
Mechanic says that ECU is bad. Read in this forum (SunnyRayToronto sounds very knowledgeable!) that ECU's don't go bad like that and it may be something else. Car runs normally.
Could it be that I have a bad ECU? or do I just have several problems... will CRC contact cleaner work?
My check engine light came on and I got the following codes:
0228 - M16/6 (Throttle valve actuator) Throttle valve jamming (iced up) P0638
1337 - Alternator serial interface
0217 - Throttle Valve stiff P2176
0569 - G3/3 (left O2 sensor before TWC KAT) Voltage is too high P2240
So I got a new alternator, a new throttle valve and 4 new O2 sensors. Cleared the codes, reset the ECU and the codes still appear. Other weird things are happening - one headlight turns off when I turn; dashboard says number plate light is blown, but it's not; same thing with park light; auto side mirror sometimes works.
Mechanic says that ECU is bad. Read in this forum (SunnyRayToronto sounds very knowledgeable!) that ECU's don't go bad like that and it may be something else. Car runs normally.
Could it be that I have a bad ECU? or do I just have several problems... will CRC contact cleaner work?
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Newbie
Joined: Oct 2019
Posts: 3
Likes: 0
2006 c230 Sedan W203
Hi folks
My check engine light came on and I got the following codes:
0228 - M16/6 (Throttle valve actuator) Throttle valve jamming (iced up) P0638
1337 - Alternator serial interface
0217 - Throttle Valve stiff P2176
0569 - G3/3 (left O2 sensor before TWC KAT) Voltage is too high P2240
So I got a new alternator, a new throttle valve and 4 new O2 sensors. Cleared the codes, reset the ECU and the codes still appear. Other weird things are happening - one headlight turns off when I turn; dashboard says number plate light is blown, but it's not; same thing with park light; auto side mirror sometimes works.
Mechanic says that ECU is bad. Read in this forum (SunnyRayToronto sounds very knowledgeable!) that ECU's don't go bad like that and it may be something else. Car runs normally.
Could it be that I have a bad ECU? or do I just have several problems... will CRC contact cleaner work?
My check engine light came on and I got the following codes:
0228 - M16/6 (Throttle valve actuator) Throttle valve jamming (iced up) P0638
1337 - Alternator serial interface
0217 - Throttle Valve stiff P2176
0569 - G3/3 (left O2 sensor before TWC KAT) Voltage is too high P2240
So I got a new alternator, a new throttle valve and 4 new O2 sensors. Cleared the codes, reset the ECU and the codes still appear. Other weird things are happening - one headlight turns off when I turn; dashboard says number plate light is blown, but it's not; same thing with park light; auto side mirror sometimes works.
Mechanic says that ECU is bad. Read in this forum (SunnyRayToronto sounds very knowledgeable!) that ECU's don't go bad like that and it may be something else. Car runs normally.
Could it be that I have a bad ECU? or do I just have several problems... will CRC contact cleaner work?
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Junior Member
Joined: Nov 2020
Posts: 16
Likes: 0
From: Manila
2009 W164 ML350 | 2003 R230 SL500
Hi folks
My check engine light came on and I got the following codes:
0228 - M16/6 (Throttle valve actuator) Throttle valve jamming (iced up) P0638
1337 - Alternator serial interface
0217 - Throttle Valve stiff P2176
0569 - G3/3 (left O2 sensor before TWC KAT) Voltage is too high P2240
So I got a new alternator, a new throttle valve and 4 new O2 sensors. Cleared the codes, reset the ECU and the codes still appear. Other weird things are happening - one headlight turns off when I turn; dashboard says number plate light is blown, but it's not; same thing with park light; auto side mirror sometimes works.
Mechanic says that ECU is bad. Read in this forum (SunnyRayToronto sounds very knowledgeable!) that ECU's don't go bad like that and it may be something else. Car runs normally.
Could it be that I have a bad ECU? or do I just have several problems... will CRC contact cleaner work?
My check engine light came on and I got the following codes:
0228 - M16/6 (Throttle valve actuator) Throttle valve jamming (iced up) P0638
1337 - Alternator serial interface
0217 - Throttle Valve stiff P2176
0569 - G3/3 (left O2 sensor before TWC KAT) Voltage is too high P2240
So I got a new alternator, a new throttle valve and 4 new O2 sensors. Cleared the codes, reset the ECU and the codes still appear. Other weird things are happening - one headlight turns off when I turn; dashboard says number plate light is blown, but it's not; same thing with park light; auto side mirror sometimes works.
Mechanic says that ECU is bad. Read in this forum (SunnyRayToronto sounds very knowledgeable!) that ECU's don't go bad like that and it may be something else. Car runs normally.
Could it be that I have a bad ECU? or do I just have several problems... will CRC contact cleaner work?
MBWorld Fanatic!
Joined: Oct 2011
Posts: 7,107
Likes: 765
From: Bronx, N.Y.
2002 ML 320 & 2006 ML500
Junior Member
Joined: Oct 2011
Posts: 57
Likes: 21
2008 CLK 550 Convertible
I have a 2009 ML550, 94,000 miles. About 2 weeks ago started getting the 1337 Alternator serial interface, sticky throttle valve and O2 sensor voltages out of whack errors. I have an Otofix diagnostic tablet which is great for driving around and watching actual values and error codes, and could watch the AFRs go from being around 1.0 to 1.3 on one bank and 0.8 on the other instantly, then throw the CEL. Started by trying to replace the alternator voltage regulator, but was sent the wrong one. The commutator was in bad shape so I sprung for a new alternator. That did not solve the above codes returning in a few miles of driving.
I also have a BenzNinja subscription, so I contacted him and was instructed to buy a flashed ECU. The ML550 ECU part number is 273 153 13 91, so I found one on Ebay (from autohubshop) that cross referenced to that part number. They fedexed a flashed ECU, 273 153 66 91. Got on a web call with him, he coded the new unit with data from the old unit, matched the VIN, and Boom, runs perfectly and no error codes on the test drive. I just had to swap the new ECU in for the old ECU, two no-tool connectors, easy peasy.
The take-home is that it's nice to be able to see the set of error codes and try to reset them, but there's no specific code that says, 'your ECU is toast'. AND there's no substitute for a Pro like BenzNinja being able to code a flashed ECU to your car car in 30 minutes in your driveway. I don't want to know what a new ECU plus re-coding at the dealership would cost- $1500? $2K? The flashed ECU was $500 and I'm 3+ years into my BenzNinja subscription with multiple uses and lots of great help. No affiliation, just a (very) satisfied customer.
I also have a BenzNinja subscription, so I contacted him and was instructed to buy a flashed ECU. The ML550 ECU part number is 273 153 13 91, so I found one on Ebay (from autohubshop) that cross referenced to that part number. They fedexed a flashed ECU, 273 153 66 91. Got on a web call with him, he coded the new unit with data from the old unit, matched the VIN, and Boom, runs perfectly and no error codes on the test drive. I just had to swap the new ECU in for the old ECU, two no-tool connectors, easy peasy.
The take-home is that it's nice to be able to see the set of error codes and try to reset them, but there's no specific code that says, 'your ECU is toast'. AND there's no substitute for a Pro like BenzNinja being able to code a flashed ECU to your car car in 30 minutes in your driveway. I don't want to know what a new ECU plus re-coding at the dealership would cost- $1500? $2K? The flashed ECU was $500 and I'm 3+ years into my BenzNinja subscription with multiple uses and lots of great help. No affiliation, just a (very) satisfied customer.
