NHTSA ID Number: 11007784
Manufacturer Communication Number: PIT5985E
TSB/Document Date: 2024-09-14
Summary
This Preliminary information communicates diagnostic tips on how to resolve a issues with vehicles that will not power up after a can bus 2 issue, lightning strike, or a failed over the air update.?
Bulletin No.: PIT5985E
Published date: 08/28/2024
Preliminary Information
PIT5985E Diagnostic Tip: No Start/ Ignition Will Not Turn ON/ No Power Due To A
CAN bus 2 Issue/Lightning Strike/ Failed Over The Air Update
Models
Brand:
Model:
Buick
Envision
Buick
Enclave
BrighDrop Zevo 400
BrighDrop Zevo 600
Brightdrop EV600
Cadillac
CT4
Cadillac
CT5
Cadillac
Escalade Models
Cadillac
LYRIQ
Cadillac
XT4
Cadillac
XT5
Chevrolet Blazer EV
Chevrolet Colorado
Chevrolet Corvette
Chevrolet Equinox EV
Silverado 1500 New (RPO J22, VIN Digit 12 =
Chevrolet
A or D)
Chevrolet Silverado 1500
Chevrolet Silverado EV Models
Chevrolet Silverado 2500HD/3500HD
Chevrolet Suburban
Chevrolet Tahoe
Chevrolet Traverse (all new)
Chevrolet Traverse
GMC
Acadia
GMC
Canyon
GMC
HUMMER EV
GMC
HUMMER EV SUV
Sierra 1500 New (RPO J22, VIN Digit 12 = A or
GMC
D)
GMC
Sierra 1500
GMC
Sierra 2500HD/3500HD
GMC
Sierra Denali EV
GMC
Yukon Models
Model
Years:
2021
2025
2024
2023
2022
2020
2020
2021
2023
2024
2025
2024
2023
2020
2024
- 2024
- 2024
-
2025
2025
2024
2024
- 2025
- 2024
- 2025
VIN:
Engine: Transmissions:
from to
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2022
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2023 - 2024
2024
2024
2021 - 2024
All
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Involved Region or
Country
North America
Some technicians may experience one or more of the following concerns:
1.
2.
3.
4.
5.
No Start
Vehicle will not crank
Vehicle will not enter into Key On, Engine Off mode (Service Mode)
Vehicle's Instrument Panel Cluster will not Illuminate
Vehicle will not shut Off.
Condition
In addition to the above concerns, when using GDS2 to connect to the vehicle,
the pop up message seen below will be displayed, prompting to turn the
ignition on, but the ignition can not be turned on. In some cases, after several
ignition button presses, the ignition may turn on. Then, the customer or dealer
technician may notice that blower motor turns on at a higher speed and then
the ignition will not be able to be turn Off.
Cause
This may be caused by either an issue with Can Bus 2, the vehicle received an
"Over The Air" (OTA) update that has failed/ or the vehicle's electrical system
was damaged by a voltage spike such as a lightning strike or an incorrect jump
start procedure.
Correction:
The following are some diagnostic tips to help isolate the concern:
1) Dealership technicians will notice that they are unable to access GDS data to review DTC's or check the
network communication status. They may experience the following pop up box, shown below, and will be
unable to get past this screen. You will need to keep hitting the continue button 5-6 times and then it will
allow you to get past this screen and then it will be possible to go into vehicle diagnostics to check DTC's
and CAN bus status.
2) Next, use GDS2 Network Communication Status and check each CAN bus (1-9) to determine which
modules are communicating and which modules are not communicating. This is similar to the Detected
State feature of the Data Bus Diagnostic Tool (DBDT), but the DBDT will not work on these models. The
GDS2 Network Communication Status can be found by following this GDS2 path: Vehicle Diagnosis/Vehicle
Communication Diagnostics/Network Communication Status.
Go through each CAN bus tab (CAN bus 1-9) and note/document the communication status of each module.
When switching from tab to tab you may want to wait 25-30 seconds to see if modules show up. The
picture below shows an example of CAN bus 2 status.
Diagnosis and repair any modules that are not communicating. If a module fails to communicate due to a
failed OTA, first try to recover the module by reprogramming the module using SPS. Then clear all DTC's
and recheck for concern.
3) If after all modules are communicating and you continue to have issues or current DTC: U1962, then
perform a Serial Data Authentication Configuration (SDAC), which is located on the SPS controller screen in
the SPS, shown below. This will have to be completed so each module recognizes each other on their
respective data buses.
4) If the SDAC fails, it will attempt to run a total of 3 times. If it fails after the third attempt, an additional
screen will pop up, identifying which module is causing the SDAC to fail. Be patient, as this pop-up screen
may take up to 25-30 seconds to appear. Take a picture of the pop-up screen and reference the latest
version of PIT5832.
5) If the SDAC passes and a labor code is generated, make sure to clear all the U codes that are current or
the vehicle still may not start.
Additional SI Keywords
U1960 U1961 U1962
Version History
Version
6
Modified
02/28/2023 - Created on.
03/06/2023- Updated to add Brightdrop Model EV600.
08/30/2023- Update to add 2024 models years and add Blazer EV and 2024
Silverado and Sierra HD models.
11/17/2023- Updated to add model years and new models that have
added VIP.
06/26/2024- Update models and model years.
08/27/2024- Update correction field and model years.
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TSB/Document ID: PIT5985E
Replacement Service Bulletin Number:
MFR Communication Date: 2024-09-13
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: UNKNOWN OR OTHER
MFR Component System:
MFR Component Subsystem:
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