Evaporator Temperature Sensor Circuit Low
The P0537 code means the vehicle's onboard diagnostic system has detected: Evaporator Temperature Sensor Circuit Low. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- $100 - $500 (parts and labor)
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What Are the Symptoms of P0537?
- Check Engine Light on
- AC compressor may not engage
- No cold air from AC
- HVAC system in protection mode
What Causes P0537? (Most Likely First)
- Short to ground in evaporator temperature sensor wiring Very High
- Failed sensor with internal short (low resistance) High
- Water intrusion in sensor connector Moderate
- Pinched sensor wire behind dashboard Moderate
Can I Still Drive with P0537?
Yes, but fix soon. P0537 is rated low severity. It is not an immediate stop-driving fault, but it will not clear itself — book the repair rather than ignoring the light.
Frequently Asked Questions
Why does the AC compressor not engage with P0537?
When the sensor reads extremely low (falsely indicating a very cold evaporator), the HVAC system disables the compressor to prevent further cooling. The system thinks the evaporator is already frozen.
What does circuit low mean for P0537?
Circuit low means the sensor signal voltage is below the expected minimum, making the system read an extremely cold temperature. This is typically caused by a short to ground in the wiring or a sensor with reduced internal resistance.
Can water damage cause P0537?
Yes. The evaporator area produces condensation during AC operation. If drain lines become clogged, water can accumulate and reach the sensor connector, causing corrosion and short circuits.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0537?
-
Read evaporator temperature sensor value; an extremely cold reading when AC is off confirms circuit low
-
Disconnect sensor and check for short to ground on the signal wire
-
Measure sensor resistance; very low resistance confirms internal short
-
Inspect wiring behind dashboard for pinched or damaged wires
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Which Vehicles Commonly Get P0537?
- 2010-2020 Nissan Rogue
- 2012-2019 Kia Sorento
- 2008-2018 Toyota Highlander
- 2011-2020 Chevrolet Traverse
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