Code result
P0645
A/C Clutch Relay Control Circuit
Moderate severity
What it means
A general circuit fault on the A/C clutch relay control - the line over which the ECU engages the magnetic clutch to drive the A/C compressor.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Open in relay or wiring
highOne of the most commonly reported causes for this code — check this first.
Related help
Get the full diagnosis
Add your vehicle and see step-by-step repair help, recalls, and TSBs in Wrenchify.
Diagnose P0645 freeNo credit card required