A/C Compressor Request High Input
Table of contents
P1538 LAND-ROVER Possible Causes
- Faulty Air Condition (A/C) Compressor
- Air Condition Compressor harness is open or shorted
- Air Condition Compressor circuit poor electrical connection
How do I fix code P1538 LAND-ROVER?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1538 LAND-ROVER code
The cost of diagnosing the P1538 LAND-ROVER code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1538 LAND-ROVER Description
Request for Air Condition (A/C) operation is signaled to the Heating and Ventilation Air Conditioning (HVAC) control unit and Engine Control Module (ECM) when the A/C control panel switch is pressed, completing a ground path. Battery voltage to A/C control panel switch is supplied via ECM connector. When an A/C operation request is received, the A/C compressor clutch will be engaged based on other operating requirements. If there is an A/C request failure, the A/C system will not work even if all other requirements are met.
The A/C compressor clutch relay is a 4-pin normally open relay located in the engine compartment fuse box. When the ECM grounds the A/C clutch relay coil the switching contacts close o allow the relay contacts to close and the A/C clutch to receive battery voltage. When the ECM opens the ground path, the clutch relay will be de-energized and shut down the A/C compressor clutch. Battery voltage to the A/C clutch relay is supplied via a fuse. Battery voltage to the A/C clutch relay coil is supplied from the main relay. A/C clutch relay coil ground is supplied via ECM. When the relay has energized the output from the switching contacts goes directly to the A/C compressor clutch. If there is an A/C clutch relay failure, the A/C system will not work even if all other requirements are met. If Diagnostic Trouble Code (DTC) P1538 is set, there is an A/C compressor operation request input signal that is too high caused by a short to battery voltage.
