P1229 GMC Sensor Power Supply Circuit Shorted

Possible causes

– Check harness body ground
– Faulty Accelerator Pedal Position (APP) sensor
– Faulty Power Steering Pressure (PSP) sensor
– Faulty Refrigerant Pressure sensor
– Faulty EVAP Control System Pressure sensor

Tech description

Start by inspecting the connections of the harness to the body grounds.

What about the obd code?

The Engine Control Module (ECM) detects a voltage of power source for sensor is excessively low or high.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)