Reduced Engine Power Issue
09-11-2018, 01:51 PM
#1
Teching In
Thread Starter
Reduced Engine Power Issue Hi LS1Tech,
I need help troubleshooting a issue on my 2010 Camaro SS. Its the M6 with the LS3, cam, bolt ons, and dyno tune. My issue that started 3 weeks ago is my car is going into "reduced enginer power" and throwing the P0641 code. No other codes. I can reset the car by unplugging the battery and it will drive fine with no codes as long as I drive easy. Once I try and get on it it goes into REP mode and throws the code. I have visually checked the wires to the sensors in the 5v reference circuit. Also tested voltage and with all sensors plugged in I get 5v. I have tried a new MAF and Clutch pedal sensor so far. I drove it to a electrical shop nearby and on the drive there I was getting 0 oil pressure, A/C refrigerant too hot, stabilitrak, and REP all coming on and going off randomly. Car ran perfect before, I had just changed the clutch master cylinder and this all started on the same day i finished that project. The shop I took it to told me ECM which I am sort of doubtful on. Where do I start, what should I check next or look for? I'm lost at this point and I can't go to a dealer since my car is modded and out of warranty. Any help is appreciated, please and thanks!
PS: I have an sct handheld that can datalog a few sensors. When I look at it my absolute throttle positions is at 22.xx% and goes up to 87.xx% when floored. The relative throttle position constantly stays at 50.19%? Seems odd to me.
Please any help is useful at this point, I'm losing my mind with this issue.
I need help troubleshooting a issue on my 2010 Camaro SS. Its the M6 with the LS3, cam, bolt ons, and dyno tune. My issue that started 3 weeks ago is my car is going into "reduced enginer power" and throwing the P0641 code. No other codes. I can reset the car by unplugging the battery and it will drive fine with no codes as long as I drive easy. Once I try and get on it it goes into REP mode and throws the code. I have visually checked the wires to the sensors in the 5v reference circuit. Also tested voltage and with all sensors plugged in I get 5v. I have tried a new MAF and Clutch pedal sensor so far. I drove it to a electrical shop nearby and on the drive there I was getting 0 oil pressure, A/C refrigerant too hot, stabilitrak, and REP all coming on and going off randomly. Car ran perfect before, I had just changed the clutch master cylinder and this all started on the same day i finished that project. The shop I took it to told me ECM which I am sort of doubtful on. Where do I start, what should I check next or look for? I'm lost at this point and I can't go to a dealer since my car is modded and out of warranty. Any help is appreciated, please and thanks!
PS: I have an sct handheld that can datalog a few sensors. When I look at it my absolute throttle positions is at 22.xx% and goes up to 87.xx% when floored. The relative throttle position constantly stays at 50.19%? Seems odd to me.
Please any help is useful at this point, I'm losing my mind with this issue.
09-11-2018, 01:56 PM
#2
TECH Senior Member
You might want to check EVERY ground on the car. After 8 years some connections start to get a little fuzzy, and then trouble starts. Wiggle every ground wire, and look for corrosion. Anything without a solid ground will malfunction.
09-11-2018, 02:27 PM
#4
Teching In
Thread Starter
Ground I am aware of are 1 on the back of each head and 1 bigger ground on the front of the passenger side head. any other groudns cars usually have?
09-11-2018, 02:31 PM
#5
Teching In
Thread Starter
https://www.obd-codes.com/p0641
lots of good info here. This code alone seems to suggest PCM coding error.
lots of good info here. This code alone seems to suggest PCM coding error.
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09-12-2018, 09:39 AM
#8
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09-13-2018, 09:00 PM
#10
TECH Senior Member
09-18-2018, 12:00 PM
#11
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I had a 09 Z06 with a P0641 and what I ended up doing to find the issue was to unplug the connectors at the individual sensors and at the ECM - then I used my multi-meter to check for continuity to ground. So one end of the multi-meter was on a ground and the other probed the wires at the ECM connectors one by one. I found a wire to the A/C pressure sensor had rubbed through and was grounding out. I think I was lucky in that it was bad enough to show up with that test, but it's worth a shot.
If it happened after the clutch master install I would be looking all of the wiring for that clutch sensor over like a hawk.
If it happened after the clutch master install I would be looking all of the wiring for that clutch sensor over like a hawk.
11-20-2018, 01:32 PM
#14
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Thread Starter
11-20-2018, 01:55 PM
#15
This is an old post - might not be an issue any longer. Post #1 and 2 about PCM related to clutch. Makes sense if the sensors are monitoring clutch pedal location.
Looks as if you have to have a clutch pedal relearn?
https://www.camaro5.com/forums/showthread.php?t=153226
Looks as if you have to have a clutch pedal relearn?
https://www.camaro5.com/forums/showthread.php?t=153226
Last edited by dlandsvZ28; 11-20-2018 at 02:01 PM.
11-20-2018, 05:59 PM
#16
Teching In
Thread Starter
This is an old post - might not be an issue any longer. Post #1 and 2 about PCM related to clutch. Makes sense if the sensors are monitoring clutch pedal location.
Looks as if you have to have a clutch pedal relearn?
https://www.camaro5.com/forums/showthread.php?t=153226
Looks as if you have to have a clutch pedal relearn?
https://www.camaro5.com/forums/showthread.php?t=153226
12-04-2018, 06:16 AM
#17
Teching In
Thread Starter
Can anyone please send me the 5v reference circuit for a 2010 Camaro SS M6? Please I want to make sure I was given the correct one a few months ago when I started having this issue.