PIE0740A

Subject:
Engineering Information (EI) – Service Transmission Message and/or Check Engine Lamp Illuminated on Driver
Information Center (DIC), DTCs P1960, P1961, P1962, P1963, P1966, P0746, P0747, P0776, P0777, P2853, P2854,
P2855, P2856, P2808, P2809, C2A18, or C2A19 Set
Attention:
Proceed with this EI ONLY if the customer has commented about this concern AND the PIE number is listed in the
Global Warranty Management / Investigate History link (GWM/IVH). If the customer has not commented about this
condition or the EI does not show in GWM/IVH, disregard the PIE and proceed with diagnostics found in published
service information. THIS IS NOT A RECALL. Refer to the latest version of Service Bulletin 04-00-89-053 for more
details on the use of Engineering Information bulletins.
This EI has been revised to add information under Breakpoint. Please discard PIE0704.
Brand:
Chevrolet
Model:
Model Year:
Corvette
Breakpoint:
from
to
2022
2023
from
Engine:
Transmission:
—
8-Speed Automatic
(RPOs M1L, M1M)
to
Applies to vehicles having
UNDER 500 Miles
Involved Region or Country
U.S. Dealers ONLY
Condition
Some customers may comment on the Service Transmission Message and/or Check Engine Lamp
illuminated on the Driver Information Center (DIC).
The technician may find one or more of the following DTCs set:
Cause
•
•
•
•
•
•
•
•
•
P1960 - Odd Gear Clutch Safety Performance 1
•
•
•
•
•
•
•
•
P2853 - Clutch 1 Pressure Discharge Performance
P1961 - Even Gear Clutch Safety Performance 1
P1962 - Odd Gear Clutch Safety Performance 2
P1963 - Even Gear Clutch Safety Performance 2
P1966 - Electronic Limited Slip Differential Safety Performance
P0746 - Transmission Control Solenoid Valve 1 Stuck Off
P0747 - Transmission Control Solenoid Valve 1 Stuck On
P0776 - Transmission Control Solenoid Valve 2 Stuck Off
P0777 - Transmission Control Solenoid Valve 2 Stuck On
P2854 - Clutch 2 Pressure Discharge Performance
P2855 - Clutch 1 Pressure Charge Performance
P2856 - Clutch 2 Pressure Charge Performance
P2808 - Transmission Control Solenoid Valve 7 Stuck Off
P2809 - Transmission Control Solenoid Valve 7 Stuck On
C2A18 - Limited Slip Differential Pressure Too High
C2A19 - Limited Slip Differential Pressure Too Low
GM Engineering is attempting to determine the root cause of the above condition. Engineering has a need to
gather information on vehicles PRIOR to repair that may exhibit this condition. As a result, this information will
be used to "root cause" the customer's concern and develop/validate a field fix.
Correction
1
Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws applicable to the activities it performs
under this bulletin, including but not limited to handling, deploying, preparing, classifying, packaging, marking, labeling, and shipping
dangerous goods. In the event of a conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you must
follow those applicable laws.
If you encounter a vehicle with the above concern, DO NOT attempt to make any repairs including Service Fast Learn. Contact one of the engineers listed
below for further instructions.
Contact Information
The Contact Information has been redacted.
Please include the following information if leaving a message:
–
Technician name
–
Dealer name and phone number
–
Complete VIN and repair order (R.O) number
On the repair order, document the date and time the call was placed (even if the engineer was not reached).
If engineering is unable to return the call within one hour, proceed with diagnosis and repair based on information found in SI.
Warranty Information
If engineer was contacted or required information was provided, use:
Labor Operation
Description
Labor Time
8486268*
Engineering Information - Service Transmission Message and/or Check
Engine Lamp On (DIC), Multiple DTCs Set
0.5 hr
*This is a unique Labor Operation for bulletin use only.
Version
2
Modified
Released March 03, 2023
Revised March 08, 2023 – Added information under Breakpoint.
2