2003 GMC Sierra 1500 Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2003 GMC Sierra 1500
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2003 GMC Sierra 1500 ProblemsHeating and AC Temperature and Air Delivery Mode Door Actuators May Fail
One or more heater & AC (HVAC) temperature and/or air delivery mode door actuator may fail, resulting in improper temperature or air delivery. If this occurs, fault code(s) should be stored in the HVAC control module which should assist in diagnoses.
It is common for the fuel level sensor in the fuel tank read the fuel level incorrectly. The sensor must be replaced to correct the condition. Our technicians recommend having the complete fuel pump module replaced on high mileage vehicles.
The daytime running lights are prone to burning out. Our technicians tell us that the light sockets may show signs of heat damage but usually are OK. Always be sure to use the correct replacement bulb for the best life expectancy. The new bulb recommendation for 1999-2003 models is #4114K (trade number).
2003 GMC Sierra 1500 QuestionsStarting issues already replaced Alternator. Why would it start now after Alt.Pw (1 answer)
After Driving to store truck wouldn't restart After some testing found alternator failed so replace. Started find
drove few miles again wouldn't start. Tried jumping- check starter & battery
Disconnected power to Alternator after 10 min. reconnected truck starts fine WHY???
2003 GMC Sierra 1500 RecallsRecall 05V161000
The second row center seat belt routing may make it difficult to position correctly on smaller passengers. If the seat belt rides up to fit around the abdomen, the risk of internal injury is increased in a crash. Dealers will cut the guide loop, remove a portion of the loop, and the remaining sides should be folded over and secured with a retainer. The recall began July 21, 2005. The GM recall number is 05037.