PCM codes 1125, 1276 & 1278
Thread Starter
Teching In
Joined: Aug 2003
Posts: 14
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PCM codes 1125, 1276 & 1278 Today on the way to the office, the PCM threw some strange codes and entered reduced power mode. 
Turning the car off and on brought me back into normal mode, but still showing a check engine light.
1125 APP SYSTEM
1276 APP Sensor Circuit Performance
1278 TCS temporarily inhibited by PCM
What is the "APP SYSTEM" and how do I go about diagnosing the problem?
TIA.
Turning the car off and on brought me back into normal mode, but still showing a check engine light.1125 APP SYSTEM
1276 APP Sensor Circuit Performance
1278 TCS temporarily inhibited by PCM
What is the "APP SYSTEM" and how do I go about diagnosing the problem?
TIA.
TECH Resident
Joined: Jan 2002
Posts: 754
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From: USA
Re: PCM codes 1125, 1276 & 1278 This would be the Drive by wire and the TAC unit was not sure what position TPS ( gas pedal) was at and it by default to play it safe trips to reduced engine mode which only allows at 2 MPH.
It will maintain those DTCs for some engine drive cycles and if it happens again will go back to reduced engine mode.
It could be the CAN network was too busy, the TAC unit could not exhange info with the PCM and thus PCM to be safe and not allow a run away ETC, shut TPS off. If it happens again you need to have TAC and TPS checked out ASAP.
It will maintain those DTCs for some engine drive cycles and if it happens again will go back to reduced engine mode.
It could be the CAN network was too busy, the TAC unit could not exhange info with the PCM and thus PCM to be safe and not allow a run away ETC, shut TPS off. If it happens again you need to have TAC and TPS checked out ASAP.
