Engine Controls - A/T Slipping/No SES Lamp/No DTC Set

Transmission Slipping or Torque Converter Clutch (TCC) Inoperative with No SES Light Displayed and No DTC P1870 (Reprogram PCM and Diagnose Vehicle Using P1870 Diagnostic Table) # 03-07-30-001A - (Mar 14, 2005)

Models:
2003 Chevrolet TrailBlazer, TrailBlazer EXT
2003 GMC Envoy, Envoy XL
2003 Oldsmobile Bravada





Built Within the Build Dates shown.

This bulletin is being revised to update the Warranty Information. Please discard Corporate Bulletin Number 03-07-30-001 (Section 07 -
Transmission/Transaxle)

Condition

Some customers may comment that the transmission appears to be slipping or that the vehicle has no TCC apply. This condition should not be confused with a noisy cooling fan. Refer to Corporate Bulletin Number 99-07-30-016B for additional information on fan noise. Investigation of the condition may show no fail records, freeze frame or DTC associated with the condition. This condition might normally have set diagnostic trouble code (DTC) P1870.

Important:
Please note that this is a MISSING DTC P1870. This condition will NOT cause a DTC P1870 to be set.

Cause

The operating software may not allow DTC P1870 (Transmission Component Slipping) diagnostic test to run. This condition is not an impairment to the operation of the vehicle or the transmission.

Correction

The vehicle should be checked to verify DTC P1870 is supported in the operating software.

1. Install the scan tool.

2. Navigate to "Specific DTC."

3. Enter P1870.

4. If the DTC is supported, the scan tool will report the status of DTC P1870. Continue with normal service diagnostics.

5. If the DTC is not supported, the scan tool will report "Invalid DTC." The vehicle PCM must be reprogrammed using TIS version 9, broadcast in August 2002, or newer, and then diagnosed for no TCC operation using the SI information for P1870.





Warranty Information





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