P0645 on Nissan
A/C Clutch Relay Control Circuit
P0645 on Nissan vehicles indicates a/c clutch relay control circuit. Au7o has documented this code across 1 Nissan model — most commonly on Murano. A general fault in the A/C compressor clutch relay control circuit driven by the control module. The commanded relay state does not match the measured circuit condition. Typical repair costs on Nissan range from $250 to $1,300, depending on the specific model and root cause.
Common Causes of P0645
- •Faulty A/C clutch relay
- •Open or short in the relay control circuit
- •Corroded/damaged connectors
- •Blown fuse
- •Internal PCM driver fault
P0645 on Nissan by Model
Nissan Murano(1 issue)
- A/C Compressor Clutch Failure2003-2014
The Murano A/C compressor clutch is prone to failure, particularly on the first and second generation models. The clutch relay, clutch coil, or the compressor clutch bearing can fail, resulting in no A/C cooling. Symptoms often start with intermittent A/C operation — cooling works sometimes but not others — before progressing to complete failure. A seized compressor clutch bearing will produce a constant squealing noise with the A/C off.
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View P0645 across all makes →Frequently Asked Questions
What does P0645 mean on Nissan?▼
P0645 stands for "A/C Clutch Relay Control Circuit." A general fault in the A/C compressor clutch relay control circuit driven by the control module. The commanded relay state does not match the measured circuit condition. On Nissan specifically, this code is documented across 1 model.
What causes P0645 on Nissan vehicles?▼
Common causes on Nissan: Faulty A/C clutch relay, Open or short in the relay control circuit, Corroded/damaged connectors, Blown fuse, Internal PCM driver fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0645 on a Nissan?▼
Repair costs on Nissan range from $250 to $1,300, depending on the specific model and root cause.
Which Nissan models have P0645 documented?▼
Au7o has documented P0645 on 1 Nissan model: Murano.