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Ron
Ron, ASE Certified Technician
Category: Pontiac
Satisfied Customers: 33851
Experience:  34 years as a Tech
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pontiac vibe seems to be common problem po171 lean code.

Customer Question

seems to be common problem po171 lean code. what is the common cause?
Submitted: 6 years ago via CarComplaints.com.
Category: Pontiac
Expert:  Ron replied 6 years ago.
Hello,
My name is XXXXX XXXXX I am here to assit you with your question and help you resolve your concern.

There is a known concern on the Vib for the P0171 code and GM say the fix is to replace the PCM (computer) . The have released a TSB that deals with the proper repair. I have enclosed it for your review.

: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:

Toyota Production Part Number

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




Customer: replied 6 years ago.
we cant find the tsb in alldata. do u have a TSB number?
Expert:  Ron replied 6 years ago.


Here is the number.

#PIP3621: DTCs P0171, P0441, and/or P2420 - Inspect Production Part Number on PCM - keywords CEL check ECM EVAP lamp lean light repeat trim updated - (Nov 9, 2005)

Customer: replied 6 years ago.
could you email the actual TSB. our TSB nubers are different than the one you gave us.
Expert:  Ron replied 6 years ago.
Here is the TSB as sent before.


#PIP3621: DTCs P0171, P0441, and/or P2420 - Inspect Production Part Number on PCM - keywords CEL check ECM EVAP lamp lean light repeat trim updated - (Nov 9, 2005)

 

View Full Image
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:

Toyota Production Part Number

89661-01120

89661-01121

89661-01130

89661-01131

GMSPO Service Part Number

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

Customer: replied 6 years ago.

IS THERE A NUMBER WE CAN CALL YOU AT?

 

Expert:  Ron replied 6 years ago.
We are not allowed to have any personal contact per Justanswers terms of service.
Customer: replied 6 years ago.

OUR PCM HAS A TOYOTA PART NUMBER 89661-01133. WHICH DOESNT MATCH THE NUMBER YOU GAVE US. SHOULD THE PCM STILL BE TNE PROBLEM?

Expert:  Ron replied 6 years ago.
If it dosnt match the number in the TSB then it needs to be replaced with the listed number in the TSB.