PowertrainP0645
SeriousSeverity: Serious - have it checked soon
A/C Clutch Relay Control Circuit
Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine computer or one of its output circuits has a fault.
2Common causes
- Engine control module fault
- Power or ground connection problem
- Low battery or charging voltage
- Wiring short or open circuit
- Software or memory fault
3Can I drive?
If the engine runs normally, drive carefully to a workshop for diagnosis. If it runs badly, stalls, or will not restart, have the car towed.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 38
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0645 | Gear Lever Y Position Circuit. Sensor 1. Operation Failure Brand | Powertrain |
| BAIC Motor | P0645 | A/C relay circuit open Brand | Powertrain |
| Mercedes-Benz | P0645 | A/C Clutch Relay Control Circuit SAE | Powertrain |
| BMW | P0645 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| BYD | P0645 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| Chery | P0645 | A/C relay control circuit Brand | Powertrain |
| Chrysler | P0645 | A/C Clutch Relay Control Circuit SAE | Powertrain |
| Daewoo | P0645 | A/C Relay Voltage Low Brand | Powertrain |
| DFFS | P0645 | A/C relay control circuit open Brand | Powertrain |
| DFFX | P0645 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| DFXK | P0645 | A/C relay circuit open Brand | Powertrain |
| EOBD | P0645 | A/C kytkinreleen ohjauspiiri Brand | Powertrain |
| Ford | P0645 | Wide Open Throttle A/C Cutout Circuit Brand | Powertrain |
| Geely | P0645 | A/C Clutch Output Circuit Fault Brand | Powertrain |
| GM | P0645 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| Great Wall | P0645 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| Hafei | P0645 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| Holden | P0645 | Air Conditioning (A/C) Compressor Clutch Relay Control Circuit Brand | Powertrain |
| Honda | P0645 | A/C Clutch Relay Control Circuit SAE | Powertrain |
| Hyundai | P0645 | A/C Clutch Relay Control Circuit SAE | Powertrain |
| Isuzu | P0645 | A/C Clutch Relay Control Circuit SAE | Powertrain |
| Land Rover | P0645 | Air conditioning clutch relay control circuit Brand | Powertrain |
| Maserati | P0645 | Air Conditioning Clutch Control Circuit Brand | Powertrain |
| Mazda | P0645 | A/C Clutch Relay Control Circuit SAE | Powertrain |
| Mitsubishi | P0645 | A/C clutch relay circuit Brand | Powertrain |
| Opel | P0645 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| Peugeot | P0645 | A/C Clutch Relay Control Circuit SAE | Powertrain |
| Porsche | P0645 | Relais Klimaanlage Brand | Powertrain |
| Proton | P0645 | A/C clutch relay circuit Brand | Powertrain |
| Saab | P0645 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| MG (SAIC) | P0645 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| Sprinter | P0645 | A/C Clutch Relay Control Circuit SAE | Powertrain |
| Suzuki | P0645 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| SWM Motor | P0645 | A/C compressor relay control circuit open Brand | Powertrain |
| Tata | P0645 | Airconditioning Relay Drive Brand | Powertrain |
| Toyota | P0645 | Air conditioner clutch relay control circuit open Brand | Powertrain |
| Volvo | P0645 | Wide Open Throttle A/C Cutout Circuit Brand | Powertrain |
| Volkswagen | P0645 | AC clutch relay control circuit; Open or short to ground Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Extended variant codes 4
These 7-character codes are manufacturer-specific variants of P0645 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P064500 | A/C Clutch Relay Control Circuit Brand | Powertrain |
| SsangYong | P064500 | Air conditioner compressor relay circuit open Brand | Powertrain |
| Mercedes-Benz | P064511 | Der Ausgang für Magnetkupplung 1 der Klimaanlage hat KS nach Masse Brand | Powertrain |
| Mercedes-Benz | P064512 | Der Ausgang für Magnetkupplung 1 der Klimaanlage hat KS nach Plus Brand | Powertrain |
6Related codes
Browse Pxxx codes or P064xx codes.