P2515: A/C Refrigerant Pressure Sensor B Circuit

What it means

The A/C refrigerant pressure sensor B circuit has a detected electrical fault. The code does not identify which component or wire is at fault.

At a glance

• Usually lights the check-engine light

How it works

A/C refrigerant pressure sensor B reports pressure to the control module through an electrical circuit. The module sets P2515 when it detects an electrical fault in that sensor B circuit; the code does not pinpoint the sensor or wiring as the cause.

Common causes

Most likely first.

1. Open or shorted wiring to the sensor
2. Failed sensor element

Symptoms

• Check-engine light
• A/C may not cool
• A/C may switch on and off unexpectedly

How to diagnose it

1. Record freeze-frame data and check live data for pressure sensor B and related A/C status to see when the fault occurs.
2. With the system off, inspect sensor B, its connector, and nearby wiring for loose plugs, damaged insulation, corrosion, or signs of rubbing.
3. Check the sensor B circuit for open wires or shorts, following the vehicle wiring diagram and the manufacturer's test procedure.
4. Verify the sensor's supply, ground, and signal circuits against the manufacturer's specification.
5. If wiring and connections pass, test sensor B as specified by the manufacturer and compare its output with the pressure reading from approved A/C service equipment.

Common fixes

• Reconnect the sensor B plug and repair damaged wiring or terminals.
• Clean or repair corroded or loose connector contacts.
• Repair an open or short in the sensor B circuit.
• Replace sensor B if it fails the manufacturer's test.

Can I keep driving?

You can generally drive if the vehicle otherwise runs normally, but the A/C may not cool or may cycle unpredictably. Avoid relying on it for demisting in conditions where clear windows are essential.