Powertrain
generic / SAE
P0645
A and C Clutch Relay Control Circuit
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.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / 45
Possible causes
- Open in relay or wiring high
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: easy
- DIY: possible
- Estimated cost: 60–250 €
- Estimated time: 0.3–1.2 h
- Component: ac clutch relay
- MIL / check engine light
Sources
References
sae:J2012