PIP-4871-A

SB-10042385-2229
File in Section:
Service Bulletin
Bulletin No.:
Date:
PIP4871A
October, 2011
PRELIMINARY INFORMATION
Subject:
Informational - MIL Possible DTCs P1B10 And Or P1B0F
Models:
2011-2012 Chevrolet Volt
This PI was superseded to update model and model years. Please discard PIP4871.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
During diagnosis of a MIL technicians may find DTC P1B0F (Drive Motor A Position Sensor Learn Incorrect) and / or
DTC P1B10 (Drive Motor B Position Sensor Learn Incorrect) stored in the HPCM.
Recommendation/Instructions:
These DTCS may be set if the vehicle was powered off while driving with the shift lever out of park. The driver may
have purposefully or inadvertently pressed the power button instead of the Drive Mode button. Review the freeze
frame records and if there is a vehicle speed reading greater than zero kph (zero mph) DO NOT attempt any repairs
for these DTCs.
Explain to the customer that inadvertently shutting the vehicle off while in motion (out of park) may cause this MIL to
illuminate, and this is design intent.
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.
Copyright 2011 General Motors LLC. All Rights Reserved.

SB-10042385-6098
File in Section:
Service Bulletin
Bulletin No.:
Date:
PIP4871C
February, 2014
PRELIMINARY INFORMATION
Subject:
MIL Possible DTCs P1B10 And Or P1B0F
Models:
2011-2013 Chevrolet Volt
2012-2013 Opel Ampera
This PI was superseded to update model list. Please discard PIP4871B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
During diagnosis of a MIL technicians may find DTC P1B0F (Drive Motor A Position Sensor Learn Incorrect) and / or
DTC P1B10 (Drive Motor B Position Sensor Learn Incorrect) stored in the HPCM.
Recommendation/Instructions
These DTCS may be set if the vehicle was powered off while driving with the shift lever out of park.
The driver may have purposefully or inadvertently pressed the power button instead of the Drive Mode button.
Review the freeze frame records and if there is a vehicle speed reading greater than zero KPH (zero mph) DO NOT
attempt any repairs for these DTCs.
Explain to the customer that inadvertently shutting the vehicle off while in motion (out of park) may cause this MIL to
illuminate, and this is design intent.
Note: There are some known instances where the diagnostic will falsely set if the vehicle is powered on while it is
plugged in.
Explain to the customer that inadvertently shutting the vehicle off while in motion (out of park) may cause this MIL to
illuminate, and this is design intent.
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.

SB-10042385-2409
File in Section:
Service Bulletin
Bulletin No.:
Date:
PIP4871B
February, 2013
PRELIMINARY INFORMATION
Subject:
Informational - MIL Possible DTCs P1B10 And Or P1B0F
Models:
2011-2012 Chevrolet Volt
This PI was superseded to update model years and add note. Please discard PIP4871A.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern
During diagnosis of a MIL technicians may find DTC P1B0F (Drive Motor A Position Sensor Learn Incorrect) and / or
DTC P1B10 (Drive Motor B Position Sensor Learn Incorrect) stored in the HPCM.
Recommendation/Instructions
These DTCS may be set if the vehicle was powered off while driving with the shift lever out of park. The driver may
have purposefully or inadvertently pressed the power button instead of the Drive Mode button. Review the freeze
frame records and if there is a vehicle speed reading greater than zero KPH (zero mph) DO NOT attempt any repairs
for these DTCs. Explain to the customer that inadvertently shutting the vehicle off while in motion (out of park) may
cause this MIL to illuminate, and this is design intent.
Note: There are some known instances where the diagnostic will falsely set if the vehicle is powered on while it is
plugged in.
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.