Code : P1A91
Make : GMC
Description : P1A91 GMC 14 Volt Power Module Temperature Sensor 1 Circuit Low Voltage
Possible causes :
– Faulty 14 Volt Power Module
– 14 Volt Power Module harness is open or shorted
– 14 Volt Power Module circuit poor electrical connection
Solutions :
– Carry out a Reset via CarDiag
– Choose a better quality fuel
– Check that the tank cap is securely closed
– Check the oil level and add more if it is lower than MAX
– Restart an Automatic diagnostic via CarDiag
– If the fault persists, you can check the “Possible causes” listed above : visually inspect (by yourself (tutorials to come) or by a professional) the wiring harness and the associated connectors, check for damaged components, and look for broken, bent, pushed, or corroded connector pins.