GAUGES LIGHT COMES ON AND ALARM ACTIVATES. GMC Truck GMC MD Conventional (C Model) 1990

* * * DCS MESSAGE * * *

SUBJECT: CHECK GAUGES LIGHT COMES ON AND ALARM ACTIVATES (CALL TAS)

MODELS: 1990-93 C5H, C6H, AND C7H TOPKICK/KODIAK WITH DIESEL LX0 (6.6L), GASOLINE LS0 (6.0L), AND LR0 (7.0L) ENGINES

CONDITION:

SOME OF THE ABOVE SUBJECT VEHICLES' CHECK ENGINE LAMP AND ALARM MODULE MAY REACT AS IF THE ENGINE IS IN AN OVERHEAT CONDITION. A FLICKERING CHECK GAUGES LAMP AND/OR A CHIRPING SOUND IS TYPICAL OF THIS CONDITION. THIS CONDITION USUALLY APPEARS WHEN THE ENGINE IS WARM.

CORRECTION:

IF YOUR CUSTOMER'S TRUCK IS REACTING IN THE ABOVE DESCRIBED MANNER, CONTACT THE MEDIUM DUTY TECHNICAL ASSISTANCE SERVICE (TAS) AT:

1-800-633-4863.

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.