Check engine light and reduced engine power

Diagnose and fix check engine light and reduced engine power

GM has issued a service bulletin #08-06-04-041B to address a check engine light and reduce engine power message. You’ll also find the following trouble codes stored in your PCM P1125, P2101, P2120, P2125 OR P2138 as well and hesitation on acceleration. The bulletin affects the vehicles listed below

Vehicles affected by service bulletin #08-06-04-041B

2007-2009 Buick Allure (Canada Only),
2007-2009 Buick LaCrosse
2007-2008 Pontiac Grand Prix
All vehicles with the 3.8L Engine (VIN 2 — RPO L26)

Cause of Check engine light and reduced engine power

GM has determined that the cause of the trouble codes might be related to moisture in electrical connector X101 located on the left (driver’s side) strut (shock) tower.

To diagnose, disconnect connector X101. Use a small screwdriver or pick to remove the wire seal from the connector on both side of the connector (male and female sides). Check for the presence of moisture on both halves of the connector.

If you find moisture, blow it dry with compressed air. Then fill the cavities on both halves with dielectric grease. Then reinstall the seals and wipe away any lubricant that may have oozed out onto the outside of the connector.

Add additional sealing to the connector halves using 3M™ Scotch® Electrical Moisture Sealant Tape, P/N 06149. Around the connector seams. Each side of the connector will require two patches to seal the connector halves and wires.

If you don’t have the 3M product, use liquid electrical tape or regular electrical tape to provide additional moisture protection.

Reconnect the connector to the strut tower and clear the trouble code.

If the same trouble codes and symptoms return, replace the accelerator pedal position sensor.

©, 2019 Rick Muscoplat