P0538

A/C Evaporator Temperature Sensor Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$22–56 (est.)

Symptoms

Incorrect operation of the air conditioner
Constant operation of the compressor
Reduced cooling efficiency
Fogging of windows

Causes

Evaporator temperature sensor malfunction
Broken or damaged wiring
Poor contact in connectors
Malfunction of the climate control control unit

How to Fix

Check the integrity of wiring and connectors
Measure sensor resistance (must meet specification)
Replace sensor if necessary
Check the operation of the air conditioning system after repair

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