Instruments - Erratic Speedometer Operation

Bulletin No.: 07-08-49-027

Date: December 04, 2007

TECHNICAL

Subject:
Erratic Speedometer Operation Or Speedometer Needle Shakes Above 60 mph (96 km/h) (Repair Poor Connection At Ground G108)

Models:
2004-2007 Buick Rainier
2002-2008 Chevrolet TrailBlazer Models
2002-2008 GMC Envoy Models
2002-2004 Oldsmobile Bravada
2005-2008 Saab 9-7X

with 4.2L Engine Only (VIN S - RPO LL8)

Condition

Some customers may comment on erratic operation of the speedometer. Others may comment that the speedometer needle shakes above 96 km/h (60 mph).

Cause

This condition may be caused by a loose or poor connection at Powertrain Control Module/Engine Control Module (PCM/ECM) ground G108.

Correction





Technicians are to inspect and repair ground G108 as necessary. Refer to callout 1 in the illustration above for the location of G108. Refer to the Testing for Intermittent Conditions and Poor Connections and the Wiring Repair procedures in SI for more information.

Warranty Information (excluding Saab U.S. Models)





For vehicles repaired under warranty, use the table.

Warranty Information (Saab U.S. Models)





For vehicles repaired under warranty, use the table.





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