What does it mean?
P1461 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: A/C Pressure Sensor Circuit High Input .
Symptoms
- MIL on
- Compressor does not engage, or shuts off almost immediately after engaging
- No cold air from the vents
- Cooling fans may run continuously or fail to come on with the A/C request
- Scan tool shows A/C pressure stuck at the top of its range even with the engine off
Likely causes
- Open in the A/C pressure sensor signal or ground circuit, which pushes the input up to reference voltage
- Signal wire shorted to the 5-volt reference or to another voltage source
- Corroded or water-contaminated connector at the pressure transducer
- Genuinely high system pressure from an overcharged system, a blocked condenser or a cooling fan that is not running
- Pressure transducer failed internally open
- Harness damage where it routes past the condenser and is exposed to stones and road spray
- PCM analog input fault, only after the wiring has been checked
How to fix it
- Compare the sensor value on the scan tool with a manifold gauge reading
- Inspect and clean the transducer connector, checking for moisture and spread terminals
- Back-probe the signal wire; a value locked near reference voltage points to an open ground or open signal
- Briefly jumper the signal pin to ground at the connector: if the reading drops to zero, the wiring and module are good and the sensor is at fault
- Verify the 5-volt reference and the sensor ground are within specification
- Confirm real system pressure and condenser airflow before replacing anything
- Replace the pressure transducer if the circuit tests good, recovering and recharging refrigerant as required