P0537

A/C Evaporator Temperature Sensor Circuit Low

Q: Is it safe to drive with P0537?

Yes. This code only affects the air-conditioning system, not the engine or how the car drives. It's a comfort issue rather than a safety one.

Q: Can I just clear P0537?

It returns if the sensor or its wiring is still faulty. Diagnose the low-voltage circuit before clearing.

A/C & climate control Generic OBD-II Low

What it means

P0537 means the ECM or HVAC module sees an abnormally low voltage from the A/C evaporator temperature sensor circuit. That sensor keeps the evaporator from freezing and helps cycle the compressor, so a faulty signal typically shows up as poor cooling or a compressor that won't engage — usually a wiring short, a failed sensor, or a bad connector. It has no effect on how the engine runs.

Low

Can I keep driving? Fully drivable — this only affects the air conditioning; the engine runs normally.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

A/C cools poorly or cycles incorrectly
A/C compressor may not engage
Evaporator can ice up or airflow drops
Check-engine or A/C indicator light on

Common causes

Most likely first

Short to ground in the evaporator temperature sensor wiringLikely
Faulty A/C evaporator temperature sensorCommon
Corroded or loose sensor connectorCommon
Open or short in the sensor signal circuitLess often
HVAC control module fault (rare)Less often

How to diagnose & fix

Work through it in order

Read freeze-frame data and inspect the evaporator temperature sensor connector and wiring for a short to ground or corrosion.
Measure the sensor's resistance and signal voltage against specification.
Replace the evaporator temperature sensor if it reads out of range with good wiring.
Clear the code and verify the A/C cycles and cools normally.

FAQ

Quick answers

Is it safe to drive with P0537?+

Yes. This code only affects the air-conditioning system, not the engine or how the car drives. It's a comfort issue rather than a safety one.

Can I just clear P0537?+

It returns if the sensor or its wiring is still faulty. Diagnose the low-voltage circuit before clearing.

Read & clear P0537 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX