Some owners may comment that the fuel and the temperature gauge in the instrument panel intermittently go to zero while the speedometer and tachometer continue to operate normally. In addition, some may comment that the low fuel indicator is displayed in the Driver Information Center (DIC) when this occurs. In a small portion of these cases, the gauges going to zero may be followed by an engine hesitation or stall.
Intermittent high resistance or connection of the negative battery cable to the top of the right side frame rail may cause the I/P gauges to intermittently go to zero.
The intermittent stall condition may be caused by the following:
Important: The bolt being tightened in the next step MUST be tightened to the torque specification listed.
Tighten Tighten the bolt to 10-12 N·m (89-106 lb in).
Tighten Tighten the bolt to 10-12 N·m(89-106 lb in).
Important: For the 2004 Pontiac Grand Prix, there are two new calibrations available. The calibrations are based on the type of fuel tank installed in the vehicle. Vehicles that have had Corporate Service Bulletin Number 04-06-04-066 performed require a calibration for a "baffled" fuel tank. In addition, some late production 2004 models may have been built with the "baffled" tank. All others should have a "non-baffled" tank.
This calibration update corrects the barometric value to prevent intermittent engine hesitation, which may lead to engine stall. The calibration update affects 2004-2005 model year Pontiac Grand Prix vehicles with the L26 engine and 2005 model year Buick Allure/LaCrosse vehicles with the L26 engine. This calibration will be available to dealerships as part of TIS 2000 incremental satellite update 6.0 (NAO version 25.003). As always, make sure your Tech 2® is updated with the latest software version.
To determine which calibration is correct for the 2004 Pontiac Grand Prix, obtain the part number of the calibration currently in the PCM using a Tech 2®. Compare that part number to that listed below and reprogram the PCM with the corresponding new calibration. For the 2005 Pontiac Grand Prix and Allure/LaCrosse, the emission system determines the correct calibration.
Emissions or Fuel Tank Usage
Current PCM Calibration P/N
New PCM Calibration P/N
2004 Pontiac Grand Prix
Non-Baffled Fuel Tank
Baffled Fuel Tank
2005 Pontiac Grand Prix
2005 Allure/La Cross
Dielectric Grease (2 oz/57 g jar)
GMSPO packaged by case of 12 jars
Parts are currently available from GMSPO.