2005 GMC Truck Envoy 2WD Erratic Speedometer Operation

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.
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.

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