P2516
A/C Refrigerant Pressure Sensor B Circuit Range/Performance
A/C refrigerant pressure
Generic OBD-II
Low
What it means
P2516 sets when the "B" air-conditioning refrigerant pressure sensor reports a value that doesn't make sense for current conditions. The computer uses this pressure to control the compressor clutch and cooling fans. It's an A/C-system fault, not an engine one — the engine runs normally, but cooling and fan operation may suffer until the sensor, wiring, or refrigerant charge is corrected.
Low
Can I keep driving? Yes — this is an air-conditioning sensor fault. The engine runs normally, though A/C cooling and cooling-fan behavior may be affected.
Common symptoms
What you'll notice
- Check-engine light on
- Weak A/C cooling or the compressor not engaging
- Cooling fans running high or not cycling as expected
- No engine performance problem
Common causes
Most likely first
- Faulty A/C refrigerant pressure sensor 'B'Likely
- Wiring open, shorted, or a poor connection at the sensorCommon
- Refrigerant charge low or overcharged, giving an implausible readingCommon
- Corroded connector at the sensorLess often
How to diagnose & fix
Work through it in order
- Scan live A/C pressure data and compare it to a manifold-gauge reading.
- Inspect the pressure-sensor connector and wiring for damage or corrosion.
- Verify the refrigerant charge is correct.
- Replace the refrigerant pressure sensor if it reads out of range.
- Clear the code and retest A/C operation.
FAQ
Quick answers
Is it safe to drive with P2516?+
Yes. This affects the air-conditioning system, not the engine. The main downside is poor cooling or the compressor staying off to protect itself.
Can I just clear P2516?+
It returns if the sensor, wiring, or refrigerant charge is still off. Fix the underlying A/C fault first.
Related codes
Often seen with P2516
Read & clear P2516 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX