No start/reduced power u2100 p0107 p0532 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Nick912 · 11-11-2024, 03:12 AM

I had a similar issue to this about a year ago. The first image contains the codes that popped up. Low power mode and codes occured directly after hitting a bump. A new battery solved the issue for a year. New codes (second image/codes in title) also correlated closely with hitting a bump. A new battery didn’t help this time.

Engine turns over for 10+ seconds before a nice loud backfire most times. Sometimes it will start, but will go into reduced power mode immediately. Just idles, can’t add throttle. Usually dies 30 or so seconds after idling. When it is idling, it is perfectly smooth though. Whatever the issue is, it is clearly electrically based. Anyone have a modicum of an idea of where to start with diagnosing the issue??

Also of note, I’m running a 232/234 cam and a full manual valvebody 4L80e (no electronics).

https://imgur.com/a/P9fg4vp

Nick912 · 11-11-2024, 05:02 PM

Also important to note, in the GM service manual, all codes I have tripped are indicative of a short to ground/open circuit for the sensors mentioned in the DTC's. The only issue is that I can not find the associated ground on the ground chart for the oil pressure sensor, map sensor, and A/C pressure sensor.

gtstorey · 11-11-2024, 05:35 PM

It's not going to show as a chassis ground, it will ground back to the ECM. GM sometime called it "Low Reference", but I'm not sure if that is the term used for 2011.

However, "short to ground" or "open circuit" in this case is probably referring to the 5V feed to the sensors. This is shared by several sensors and if one of them is shorted to ground it pulls all of them down. The short to ground can be within a sensor.

The Camaro will have more than one 5v circuit, you need to see if the ones you have problems on all reference the same on.

11-11-2024, 03:12 AM	#1
Nick912 Drives: 2011 Camaro SS Join Date: Sep 2020 Location: Chicago Posts: 28 View My Garage	No start/reduced power u2100 p0107 p0532 I had a similar issue to this about a year ago. The first image contains the codes that popped up. Low power mode and codes occured directly after hitting a bump. A new battery solved the issue for a year. New codes (second image/codes in title) also correlated closely with hitting a bump. A new battery didn’t help this time. Engine turns over for 10+ seconds before a nice loud backfire most times. Sometimes it will start, but will go into reduced power mode immediately. Just idles, can’t add throttle. Usually dies 30 or so seconds after idling. When it is idling, it is perfectly smooth though. Whatever the issue is, it is clearly electrically based. Anyone have a modicum of an idea of where to start with diagnosing the issue?? Also of note, I’m running a 232/234 cam and a full manual valvebody 4L80e (no electronics). https://imgur.com/a/P9fg4vp __________________ CAI, Long Tubes, Full 3" exhaust, Texas Speed Stage 4 "F35" cam, 4l80e swap with Extreme Automatic's Transbrake RMVB.

11-11-2024, 05:02 PM	#2
Nick912 Drives: 2011 Camaro SS Join Date: Sep 2020 Location: Chicago Posts: 28 View My Garage	Also important to note, in the GM service manual, all codes I have tripped are indicative of a short to ground/open circuit for the sensors mentioned in the DTC's. The only issue is that I can not find the associated ground on the ground chart for the oil pressure sensor, map sensor, and A/C pressure sensor. __________________ CAI, Long Tubes, Full 3" exhaust, Texas Speed Stage 4 "F35" cam, 4l80e swap with Extreme Automatic's Transbrake RMVB.

11-11-2024, 05:35 PM	#3
gtstorey Drives: 2010 Camaro SS2,L99, LSA SC Join Date: Aug 2017 Location: Huntsville, AL Posts: 2,450	It's not going to show as a chassis ground, it will ground back to the ECM. GM sometime called it "Low Reference", but I'm not sure if that is the term used for 2011. However, "short to ground" or "open circuit" in this case is probably referring to the 5V feed to the sensors. This is shared by several sensors and if one of them is shorted to ground it pulls all of them down. The short to ground can be within a sensor. The Camaro will have more than one 5v circuit, you need to see if the ones you have problems on all reference the same on.