A/C Refrigerant Pressure Sensor Circuit Low
The P2517 code indicates that the A/C refrigerant pressure sensor circuit is reading a voltage lower than the expected range. This sensor monitors the pressure of the refrigerant in the A/C system and sends a signal to the PCM. A low circuit voltage can be caused by a faulty sensor, wiring issues, low refrigerant charge, or a problem with the PCM. This can lead to improper A/C operation or the system being disabled to protect the compressor.
1. Most Common Causes
- Faulty A/C refrigerant pressure sensor 'B' (internal short to ground)
- Short to ground in the signal or reference voltage wiring
- Open circuit or high resistance in the wiring or connectors between the sensor and PCM
- Corroded, oxidized, moisture-contaminated, or damaged/pushed-out pins in the sensor connector
- Failed Powertrain Control Module (PCM) - rare
2. Symptoms You Will Notice
- A/C system inoperative or blows warm air
- A/C compressor clutch not engaging
- Check Engine Light illuminated
- Reduced cooling performance
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to retrieve the code and check for additional codes.
Step 2: Visually inspect the A/C pressure sensor connector and wiring for damage or corrosion.
Step 3: Check refrigerant pressure using a manifold gauge set to verify proper charge.
Step 4: Test the sensor voltage and ground circuits with a multimeter; compare to manufacturer specs.
Step 5: If sensor and wiring are good, replace the A/C refrigerant pressure sensor.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
Yes, it is generally safe to drive, but the A/C system may not work properly. Prolonged driving with low refrigerant can damage the compressor.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the sensor price and labor rates.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.