DTCs P0171, P0441, and/or P2420 - Inspect Production Part Number on PCM - keywords CEL check ECM EVAP lamp lean light repeat trim updated
| Subject: | DTCs P0171, P0441, P0455 and/or P2420 - Inspect Production Part Number on PCM |
| Models: | 2005 Pontiac Vibe |
| with Automatic Transmission (RPO MU4) |
| and Base Front Wheel Drive (5th Digit of VIN = L) |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
On rare occasions, a check engine light may be experienced with DTC P0171, P0441, P0455, and/or P2420. These DTCs may be a result of an internal PCM driver issue that may keep the EVAP purge solenoid control circuit grounded at times instead of supplying a pulse width signal on the circuit.
Recommendation/Instructions:
If the SI diagnostics do not isolate a cause for the concern, inspect the white PCM label for any of the following part numbers, which may be causing the concern:
89661-01120 | 89661-01121 | 89661-01130 | 89661-01131 |
88973581 | 88974255 | 88973582 | 88974256 |
If any of the above part numbers are found, replace the PCM with the correct one listed below:
Auto FWD with RPO JL4 | Auto FWD without RPO JL4 |
|---|---|
88974332 | 88974333 |
Important: These part numbers, or any that follow, are designed to address the described concern.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
