Sorry, the NHTSA has not posted this TSB document yet.
You can still get the detailed info from Chevrolet for this TSB. Call your local Chevrolet dealer's service department & ask for a copy of TSB# TB-080849017B.
GENERAL MOTORS: THE INSTRUMENT GAUGES APPEAR TO BE ERRATIC/INACCURATE OR ARE INOPERATIVE. THIS CONDITION MAY BE INTERMITTENT AND OCCUR OVER ONE OR MULTIPLE IGNITION CYCLES, EVENTUALLY RESETTING ITSELF. *PE
