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P0645
A/C Clutch Relay Control Circuit
Generic · transmission
Data confidence
90%
The control module detected improper operation of the A/C Clutch Relay Control circuit.
Possible causes
- Wiring
- AC system
TuningBot DTC Database · v4.37.15
P0645 A/C Clutch Relay Control Circuit
Generic (OBD-II) interpretation in the TuningBot DTC database.
What P0645 means
Related and nearby codes
How to read P0645
P
Powertrain: engine, transmission and driveline systems.
0
Generic SAE-standard code: same meaning on every make.
645
Specific fault index within the subsystem.
Frequently asked questions about P0645
What does P0645 mean?
A/C Clutch Relay Control Circuit. The control module detected improper operation of the A/C Clutch Relay Control circuit.
Is P0645 generic or manufacturer-specific?
P0645 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.
Can TuningBot remove P0645 at file level?
If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry. Checksum correction is not included: it is a separate, optional service. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.
Other file services
Understand the system behind this code: Diagnostic Strategy and DTC Logic