A/C Request Circuit High Voltage
Table of contents
P1538 BUICK Possible Causes
- Faulty A/C Clutch Relay
- A/C Clutch Relay harness is open or shorted
- A/C Clutch Relay circuit poor electrical connection
How do I fix code P1538 BUICK?
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 BUICK code
The cost of diagnosing the P1538 BUICK 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 BUICK Description
The Powertrain Control Module (PCM) activates the A/C clutch relay when the PCM detects an A/C request. Voltage is present at both the A/C compressor clutch and the A/C clutch status terminal at the PCM when the relay is activated.