PIC5920F

Bulletin No.: PIC5920F
Published date: 03/8/2017
Preliminary Information
PIC5920F Vehicle Will Not Charge And Hybrid Loss Of Isolation With DTC P0AA6 And/Or P1F0E
P0DAA
Models
Brand:
Model:
VIN:
Model Years:
from
to
Engine:
Transmissions:
Chevrolet
Volt
2011 - 2014
All
All
LUU
MKA
Cadillac
ELR
2014
All
All
LUU
MKA
Opel
Ampera
2011 - 2014
All
All
LUU
MKA
Holden
Volt
2013 - 2014
All
All
LUU
MKA
Supersession Statement
This PI was superseded to update Recommendation/Instructions and Warranty Information. Please discard PIC5920E.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition / Concern
Some customers may comment that their vehicle will not charge. Customers may also comment that a Check Engine Lamp is
illuminated. Technicians may find a current code P0AA6 and / or a P1F0E set on 2011-2013 Volt or a P0DAA on 2014 Chevy Volt, Opel
Ampera or Cadillac ELR in the HPCM2. When diagnosing these DTC’S, potential causes to consider when evaluating the vehicle are:
1. A loss of Hybrid/EV Battery Pack coolant (external or internal to the Hybrid/EV Battery Pack)
2. A loss of high voltage isolation within the battery cells or battery sections themselves
Recommendations / Instructions
Locate the Isolation Test Resistance that is located in the HPCM 2 data list under HPCM 2 / Data Display / Data Display / Hybrid/EV
Powertrain Control Module 2 Data and note the current value on the repair order.
Also note the Isolation Resistance from the freeze frame records in the HPCM2 for the P0AA6, P1F0E, and/or P0DAA DTC.
Inspect Hybrid/EV Battery Pack coolant level by doing both of the following:
Note if the coolant level is low in the under hood reservoir.
Remove the drain plug for the battery to see if any water/coolant drains out, indicating a coolant leak in the battery pack.
If necessary, refer to the Hybrid/EV Battery Cooling System Diagnostic in Service Information.
Important: All P0AA6 failures must include an inspection of the Hybrid/EV Battery Pack drain plug, located on the battery tray,
regardless of fluid level at the Hybrid/EV Battery Pack coolant reservoir. If any moisture is found during the drain plug inspection,
contact the GM Technical Assistance Center (TAC).
If the coolant level in the reservoir is at the proper level and there is no coolant or water drained from the battery from the drain
plug inspection, then update the HPCM2 and BECM (Battery Energy Control Module) with the latest Calibrations in TIS-2-Web. After
installing the current calibration in each module, cycle the ignition two times waiting 2 minute in between each ignition cycle and
then check the Isolation Test resistance (in the HPCM2/ Data Display/ Data Display / Hybrid/EV Powertrain Control Module 2 Data) and
make sure the test resistance now reads greater than 275 kOhms. If the isolation resistance now reads 275 kOhms or greater, then
no further Attention is needed. If the DTC sets again, then check the freeze frame for HPCM2 again also.
Important: If you have any moisture that is found in the battery during the drain plug inspection or the Isolation test resistance will
not go above 275 kOhms after the HPCM2 and the BECM have been updated, please contact the Technical Assistance Center (TAC)
for further direction.
Warranty Information
For 2011- 2014 Volt/Ampera And 2014 Cadillac ELR
Labor
Operation
Description
Labor Time
2880268*
Reprogram the HPCM2 and the BECM.
0.6 hr
* This is a unique labor operation for bulletin use only. This will
not be published in the Labor Time Guide.
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.
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