P0538

A/C Evaporator Temperature Sensor Circuit High

Moderate severity

The evaporator temperature sensor signal voltage is above the upper diagnostic threshold. Typically open circuit or short to power.

Common causes

Sensor open internally
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $70-330
Wiring open or disconnected
A plausible cause — test and verify before replacing parts.
medium
Typical part cost: $70-330
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does P0538 mean?

P0538 means "A/C Evaporator Temperature Sensor Circuit High". It is a generic OBD-II code that points to a fault in the vehicle speed, idle control, auxiliary inputs.

What are the most common causes of P0538?

sensor open internally; wiring open or disconnected; connector pins corroded - high contact resistance — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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