P0535
A/C Evaporator Temperature Sensor Circuit
Air conditioning (HVAC)
Generic OBD-II
Low
What it means
P0535 means there's a fault in the circuit for the A/C evaporator temperature sensor, which tells the system how cold the evaporator is so it can cycle the compressor and prevent icing. It's a low-severity, air-conditioning-only fault — the engine runs normally — but it can cause poor or inconsistent cooling until the sensor or its wiring is repaired.
Low
Can I keep driving? Safe to drive — this only affects the air conditioning; the engine runs normally and you can fix it at your convenience.
Common symptoms
What you'll notice
- Check-engine light on
- Poor or inconsistent A/C cooling
- A/C compressor cycling incorrectly or not engaging
- No effect on how the engine runs
Common causes
Most likely first
- Faulty A/C evaporator temperature sensorLikely
- Damaged wiring or connector in the sensor circuitCommon
- Loose or corroded electrical connectionCommon
- Rarely, a failed HVAC control module or ECMLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and locate the evaporator temperature sensor at the A/C evaporator.
- Inspect the connector and wiring for corrosion, damage, or a loose fit.
- Measure the sensor resistance against its temperature spec; replace it if out of range.
- Clear the code and confirm normal A/C operation on re-test.
FAQ
Quick answers
Is it safe to drive with P0535?+
Yes — it only affects the air-conditioning system, not engine operation or safety. The A/C may just cool poorly until it's fixed.
Can I just clear P0535?+
It will return once the sensor circuit is read again unless the sensor or its wiring is repaired.
Related codes
Often seen with P0535
Read & clear P0535 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