2009 GMC Sierra
Mileage
102,654
Service Date
10/8/2025
Services Performed
- Checked customer's concern and noticed message (Engine Hot A/C tuned off). Performed visual inspection in to engine bay and found nothing abnormal, scanned vehicle for codes and found; P0128 engine coolant temperature (ECT) below thermostat regulating temperature, P0513 theft deterrent key incorrect. DTC present, monitored engine data and notice temperature sensor working properly. Checked for proper operation of radiator fans and found good, checked for coolant circulation and found good , using external thermometer was able to confirm that thermostat assembly is not working causing computer to go in to a safe mode. Recommend thermostat assembly.
- THERMOSTAT – Remove & Replace – 1500,V8
- Tire Pressure: Front Psi ( 35 ), Rear Psi ( 35 )
Floyd / Phyllis D. gave our service a 5 star review on 10/8/2025
