A/C Pressure Sensor Circuit High Voltage
The P1467 code indicates that the powertrain control module (PCM) has detected an abnormally high voltage in the A/C refrigerant pressure sensor circuit. This three-wire transducer sends a voltage signal proportional to system pressure, which the PCM uses to protect the compressor and control the condenser fan. When the voltage exceeds the calibrated threshold for a set time, the PCM sets this DTC, reporting a high circuit electrical condition. This is typically caused by an electrical fault that raises the signal voltage beyond its normal operating range, such as a short to reference voltage or battery positive, a poor ground that shifts the signal voltage, or internal damage to the pressure transducer itself.
01. Most Common Causes
- Faulty A/C refrigerant pressure sensor (transducer) with internal damage or out-of-range output
- Short circuit in the signal wire to reference voltage (VREF) or battery positive (B+)
- Corroded, bent, or bridged pins in the sensor connector between signal and voltage terminals
- Excessive resistance or open circuit in the sensor ground wire, causing reference voltage to rise
- Internal PCM failure in the sensor signal conditioning or analog input circuit (rare)
02. Symptoms You Will Notice
- A/C system may not engage or blows warm air
- Engine cooling fan may run continuously or erratically
03. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to the vehicle
Visually inspect the A/C pressure sensor connector and wiring for damage, corrosion, or shorts
With the ignition on and engine off, measure the signal voltage at the sensor connector and compare to manufacturer specifications
If voltage is near VREF (e.g., 5V), suspect a short to reference or a faulty sensor; if voltage is high but not at VREF, check ground circuit resistance
If all wiring and sensor check out, test the PCM by backprobing the signal pin at the PCM connector
1. Frequently Asked Questions
Is it safe to drive?▼
Yes, but the A/C may not work properly, and the engine cooling fan may run continuously. It's best to diagnose and repair soon to avoid potential compressor damage.
How much does it cost to fix?▼
Typically $150 to $400, including diagnosis and parts. Sensor replacement costs $50–$150, plus labor. Wiring repairs may add $100–$200.