NHTSA ID Number: 10154570
Manufacturer Communication Number: PIT4811C
Summary
This Preliminary Information communication provides the technician with the steps on how to diagnose vehicles with a no crank with multiple Diagnostic Trouble Codes set in several different modules with Regular Production Option Code HP2. Technician will retrieve all the Diagnostic Trouble Codes that are set current in the vehicle. When there are multiple Diagnostic Trouble Codes technician may wonder were to start the diagnose process. Technician will address Diagnostic Trouble Codes P1AE2-P1AE4, P1B05, or P1B06 first as they’re related to the High Voltage System Interlock Circuit for the high voltage system. Second Diagnostic Trouble Codes to address will be any loss of communication Diagnostic Trouble Codes related to the Powertrain expansion bus or the high speed LAN bus. Then address any low voltage concerns that may be related to a low 12 volt battery.
22 Affected Products
Vehicles
CADILLAC | ESCALADE | 2009-2013 |
| CHEVROLET | SILVERADO 1500 | 2009-2011 |
| CHEVROLET | SILVERADO 2500 | 2012 |
| CHEVROLET | SILVERADO 3500 | 2013 |
| CHEVROLET | TAHOE HYBRID | 2008-2013 |
| GMC | YUKON HYBRID | 2008-2013 |
SEOCONTENT-START
Bulletin No.: PIT4811C
Published date: 12/7/2018
Preliminary Information
PIT4811C Hybrid No Crank With Multiple Diagnostic Codes
Models
| Brand: | Model: | Model Years: | VIN: | Engine: |
Transmissions: |
|
| from | to | |||||
| Cadillac |
Escalade | 2009 – 2013 | All | All | LFA | M99 |
| Chevrolet |
Tahoe Hybrid | 2008 – 2013 | All | All | LFA | M99 |
| GMC | Yukon Hybrid | 2008 – 2013 | All | All | LFA | M99 |
| Chevrolet |
Silverado Hybrid | 2009 – 2013 | All | All | LFA | M99 |
| GMC | ierra Hybrid | 2009 – 2013 | All | All | LFA | M99 |
Supersession Statement
This PI was superseded to update Condition/Concern. Please discard PIT4811B.
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition / Concern
You may experience a “No Crank” concern with multiple codes set in several different modules.
After retrieving the codes and recording them down on paper, you may wonder which codes you should start with first.
Recommendations / Instructions
When dealing with a “No Crank” concern, please use the following diagnostic approach in the order shown below:
- Address codes: P1AE2-P1AE4, P1B05, or P1B06 first, as they’re related to the High Voltage System Interlock Circuit for the high voltage system. These codes may be experienced after a service part has been installed due to the High Voltage disconnect not being fully seated, the drive motor generator control module sight shield (PIM cover) not fully seated, or the 2 wire connector may be disconnected at the transmission 3-phase cable cover .
- Address any CURRENT loss of communication DTC’s that create a “U code” related to the Powertrain expansion bus or the high speed LAN bus.
- Address any low voltage concerns that may be related to a low 12 volt battery.
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.
SEOCONTENT-END
Bulletin No.: PIT4811C
Published date: 12/7/2018
To View or Download this Document Click Here
Bulletin No.: PIT4811B
Date: Mar-2016
To View or Download this Document Click Here
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