P0537 code meaning
A/C Evaporator Temperature Sensor Circuit Low
What P0537 means
The evaporator temperature sensor, an NTC thermistor behind the evaporator, prevents icing: near 0–3 °C the compressor is switched off or reduced. Usually the climate module reads it and reports body codes; P0535–P0539 only arise where the engine module controls the compressor and reads the sensor. P0537 means the signal voltage is below its limit; with the usual NTC voltage divider that is a signal shorted to ground or a shorted sensor, read as implausibly warm – icing protection may then fail. No manufacturer document available to us uses this code; the description follows CARB's input component rules.
P0537 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 4 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0537
- Air conditioning not cooling
- Possible icing
- Compressor permanently on or locked out
Common causes of P0537
- Most likelySignal line shorted to ground
- Most likelySensor shorted internally
- PossibleCondensate in the connector (leakage to ground)
- Less likelyEngine module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Evaporator temperature sensorSensor wiringEngine control module
What each part of P0537 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 5 | Area: vehicle speed, idle control and auxiliary inputs. |
| 37 | The exact fault in that area. |
What to do next
- Note P0537 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0537
What does P0537 mean?
P0537 means "A/C Evaporator Temperature Sensor Circuit Low". The evaporator temperature sensor, an NTC thermistor behind the evaporator, prevents icing: near 0–3 °C the compressor is switched off or reduced. It is a generic code, so it means the same on every make.
Is it safe to drive with P0537?
P0537 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0537 fail an emissions test?
P0537 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0537 to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0537 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.