Wide open throttle A/C cutoff relay circuit
The A/C compressor relay isn't disengaging when the engine needs full throttle power, similar to leaving the parking brake slightly on while accelerating. This wastes engine power and can cause performance issues during hard acceleration.
The ECU monitors the Wide Open Throttle (WOT) signal and commands the A/C cutoff relay to disengage the compressor when throttle reaches maximum position. The ECU detects a fault when the relay circuit shows improper voltage or continuity response to the command signal.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| WOT Relay Command Voltage | 12V when commanded on, 0V when off | Voltage stuck at incorrect level or no voltage response |
| Relay Circuit Continuity | < 5 ohms resistance when engaged | > 10 ohms or open circuit detected |
Code P1465 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1465 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.