Service Engine Soon Light On, P1680 (Reprogram or Replace PCM). Oldsmobile Bravada

Subject:

Service Engine Soon Light On, P1680 (Reprogram or Replace PCM)

Models:

2004 Buick Rainier

2004 Chevrolet Trailblazer

2004 GMC Envoy

2004 Oldsmobile Bravada

with 4.2L Engine (VIN S - RPO LL8)

Condition

Some customers may comment on the Service Engine Soon Light coming on. Upon investigation, the technician may find a P1680 diagnostic trouble code.

Correction

Check the resistance of the accelerator pedal position sensors using the procedure in the appropriate Service Information for DTC P1680.

If the resistance of the accelerator pedal position sensor is within the specifications shown in the Service Information and the vehicle was built prior to the following VIN breakpoints, then reprogram the PCM with the latest calibration.

If the resistance of the accelerator pedal position sensor is within the specifications shown in the Service Information and the vehicle was built after the following VIN breakpoints, then replace the PCM. If the resistance of the accelerator pedal position sensor is outside the specifications shown in the Service Information, then continue with the diagnostics for DTC P1680.

VIN Breakpoints

•	Vehicles built at Oklahoma City Assembly Plant - 46192755

•	Vehicles built at Moraine Assembly Plant - 42315833

The new calibration will be released beginning with TIS satellite data update version 1.5 for 2004, available January 2004. As always, make sure your TECH2® is updated with the latest software version.

Parts Information

Part Number	Description	Qty
12574976	Module, Powertrain Control	1 as Req'd

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under the applicable 8 year/80,000 mile (130,000 kilometer) emission controller warranty, use:

Labor Operation	Description	Labor Time
J6353	Module, Powertrain Control - Reprogram	0.4 hr
Add:	Diagnostic Time	0.0-0.3 hr
J6360	Module, PCM/VCM - Replace	0.9 hr
Add:	Diagnostic Time	0.0-0.3 hr