PI1473

Bulletin No.: PI1473
Date: May-2015
Subject:
MIL Illuminated with Firm Shifts, DTCs P0606 or P2818
Models:
2015 Chevrolet Corvette
Equipped with 8L90 Automatic Transmission (RPO M5U)
Attention:
This PI also applies to any of the above models that may be Export vehicles.
Condition/Concern
Some customers may comment on any of the following conditions:
•
Firm 1-2 upshifts.
•
Firm 3-1 downshifts.
Note: During low speeds with no accelerator pedal input, the downshift will most likely be a 3-1 shift.
•
Malfunction Indicator Lamp (MIL) illuminated with DTC P0606 or P2818 set as current or history.
Recommendation/Instructions
An revised software calibration has been released to address these conditions.
Update the Transmission Control Module (TCM) using the Service Programming System (SPS) with the latest calibrations available on TIS2WEB. Refer to the
K71 Transmission Control Module: Programming and Setup (8L45/90) in SI.
Important: Verify the battery voltage is more than 12 volts but less than 16 volts before proceeding with reprogramming. The battery must be fully charged
BEFORE reprogramming.
Important: During reprogramming, the battery voltage must be maintained within the proper range of 12-15.5 volts. CONNECT the approved Midtronics®
PSC 550 Battery Maintainer (SPS Programming Support Tool (EL-49642) to the vehicle or the GR8 (EL50313) in the power supply mode.
After the reprogramming of the TCM, the transmission service fast learn procedure is required.
Transmission Service Fast Learn Procedure
Important: Failure to perform this procedure may result in poor transmission performance, DTCs being set, or customer dissatisfaction. Perform the service
fast learn procedure in the exact sequence as listed below.
1.
Ignition ON, clear any DTCs with a scan tool.
2.
Ignition OFF, and all vehicle systems OFF. It may take up to 2 minutes for all vehicle control modules to power down.
Note: If the transmission fluid temperature is not between 75°C (167°F) and 85°C (185°F) the scan tool will not allow you to perform the service fast
learn procedure.
3.
Engine running, transmission in drive position with brake applied. Perform the service fast learn procedure with a scan tool. Follow the instructions on
the scan tool.
4.
Ignition OFF for 2 minutes.
Warranty Information
For vehicles repaired under the Powertrain coverage, use the following labor operation. Reference the Applicable Warranties section of Investigate Vehicle
History (IVH) for coverage information.
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Labor Operation
Description
Labor Time
2810175
Transmission Control Module Reprogramming with SPS
Use Published Labor
Operation Time
Additional SI Keywords:
harsh
GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may
occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that
your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION
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