Favorites Grayed Out or Unavailable At Times – 2018-2019 Buick Cadillac GMC

Bulletin No.: PIC6340
Published date: 10/15/2018

Preliminary Information

PIC6340 Favorites Grayed Out or Unavailable At Times

Proactive

Models

Brand: Model: Model Years: VIN: Engine: Transmissions:
from to
Buick Regal 2018 All All All All
Cadillac ATS 2018 – 2019 All All All All
Cadillac CTS 2018 – 2019 All All All All
Cadillac XTS 2018 – 2019 All All All All
GMC Terrain 2018 All All All All

 

Involved Region or Country North America
Additional Options (RPO) IOS, IOT, or IOU
Condition A customer may comment that some Favorites will be grayed out at times. Attempting to select that Favorite may result in a message that it is currently unavailable.
Cause Software anomaly

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Outside Air Temperature Does Not Read Correctly – 2017-2019 Buick LaCrosse

Bulletin No.: PIC6232A
Published date: 10/22/2018

Preliminary Information

PIC6232A Outside Air Temperature Does Not Read Correctly

Proactive

Models

Brand: Model: Model Years: VIN: Engine: Transmissions:
from to
Buick LaCrosse 2017 – 2019 All All LGX All

 

Involved Region or Country North America
Condition A vehicle may be brought into the dealer with a complaint of the outside air temperature/ambient air temperature display reading incorrectly.
Cause The system may be operating as designed but the customer does not understand that there may be a delay in the update of the outside air temperature (OAT) display due to the update strategy involved.

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Circular Image Distortion on Any of the Screens Including the Buick Tri-Shield Start Up Screen – 2018-2019 Buick LaCrosse

Bulletin No.: PIC6335B
Published date: 10/30/2018

Preliminary Information

PIC6335B Circular Image Distortion on Any of the Screens Including the Buick Tri-Shield Start Up Screen

Product Investigation Review Required

Models

Brand: Model: Model Years: VIN: Engine: Transmissions:
from to
Buick LaCrosse 2018 4/10/2018 End of Production All All
Buick LaCrosse 2019 6/08/2018 9/24/2018 All All

Note:  The Model Table above shows the VIN build date range for vehicles affected by this PI.

Involved Region or Country North America and all Export Regions
Additional Options (RPO) IO5 or IO6
Condition Some customers may comment that they notice a circular image distortion on any of the screens, including the Buick tri-shield starting screen as shown in the examples below. Some technicians have also reported that disconnecting and reconnecting the battery may improve the image quality.
Cause This is a result of a radio control (ICS) assembly software concern.

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Diagnostic Aid for DTCs P1AEE and P1AEF, Control Module Hybrid/EV Battery System Voltage High Voltage (Over-Voltage) – 2016-2019 Chevrolet Volt

Bulletin No.: PIC6285B
Published date: 10/1/2018

Preliminary Information

PIC6285B Diagnostic Aid for DTCs P1AEE and P1AEF, Control Module Hybrid/EV Battery System Voltage High Voltage (Over-Voltage)

Product Investigation Review Required

Models

Brand: Model: Model Years: VIN: Engine: Transmissions:
from to
Chevrolet Volt 2016 – 2019 All All All All

 

Involved Region or Country North America, China
Additional Options (RPO) N/A
Condition Diagnostic Aid for DTCs P1AEE and P1AEF, Control Module Hybrid/EV Battery System Voltage High Voltage (Over-Voltage)
Cause This document is intended to help diagnose the reason P1AEE and P1AEF set in the vehicle.  When these DTCs set, the control system forces the propulsion system to become inactive, the READY light will extinguish, and the Malfunction Indicator Lamp (MIL) will illuminate.

These diagnostics set within milliseconds of the high voltage system voltage being over its voltage operating limit.  It is the function of the Motor Control Modules to detect the over-voltage condition, but it is very unlikely that replacing the T6 Drive Motor Generator Control Module will be the correct repair.  Looking at the freeze frame data captured by the Hybrid Powertrain Control Module (1), Hybrid Powertrain Control Module 2, and the Drive Motor Generator Control Modules 1 and 2, is critical to continuing with the diagnosis.

The diagnostics are known to set due to one of four categories.  Using the freeze frame data will help determine which course of action is needed for the repair.

View the freeze frame information for each module individually.  To do this in GDS2, use Module Diagnostics / Diagnostic Trouble Codes (DTC) / Freeze Frame/Failure Records for each module with codes.

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ELR And VOLT Misfire Detection – Service Information – 2014-2016 Cadillac ELR & 2011-2019 Chevrolet Volt

Bulletin No.: PIP5222A
Published date: 10/17/2018

Preliminary Information

PIP5222A ELR And VOLT Misfire Detection – Service Information

Models

Brand: Model: Model Years: VIN: Engine: Transmissions:
from to
Cadillac ELR 2014 – 2016 All All 1.4L LUU All
Chevrolet Volt 2011 – 2019 All All 1.4 LUU or 1.5L L3A All

 

Supersession Statement

This PI Was Superseded To Update Model Years. Please Discard PIP5222.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

 

Condition / Concern

Difficulty in detecting internal combustion engine (ICE) misfires with a fully charged high voltage (HV) battery.

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