P2516 Fault Code

A/C Refrigerant Pressure Sensor B Circuit Range/Performance

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2516 fault code signifies an issue with the A/C Refrigerant Pressure Sensor B, indicating that the sensor's output is outside the expected range or performance levels. This code can lead to inefficiencies in the air conditioning system, affecting your vehicle's ability to cool the interior effectively. It typically triggers when the Engine Control Module (ECM) detects that the data received from the sensor is not within the predetermined parameters.

What are the symptoms of the P2516 code?

Signs that may indicate a P2516 fault code include:

• Inconsistent or poor A/C performance, such as weak airflow or failure to cool.
• Air conditioning system cycles on and off frequently.
• Increased humidity or unusual odors from the A/C vents.
• Elevated engine temperatures if the A/C system is overburdened.

What causes the P2516 code?

Common causes of the P2516 code include:

• Faulty A/C refrigerant pressure sensor.
• Damaged wiring or connectors in the sensor circuit.
• Low refrigerant levels due to leaks in the system.
• Corrosion or poor connections at the sensor terminals.
• Malfunctioning A/C control module or ECM.

How to fix P2516?

To resolve the P2516 code, consider the following steps:

1. Use a scan tool to confirm the code and clear it from the system.
2. Inspect the A/C refrigerant pressure sensor for damage or disconnection.
3. Check the wiring and connectors for signs of wear, corrosion, or breakage.
4. Test the refrigerant level and refill if necessary, while checking for leaks.
5. Replace the A/C refrigerant pressure sensor if it is found to be malfunctioning.
6. After repairs, reset the ECM and run the vehicle to check if the fault code reappears.