Error code

OBD2 P0074

OBD2P0074
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Ambient Air Temperature Sensor Circuit Intermittent.

Severity

lowYes, but climate control issues may affect comfort.

Summary

P0074 indicates an intermittent issue with the ambient air temperature sensor circuit, which is located outside the vehicle near the radiator or behind the bumper cover.

Symptoms

  • Climate control system malfunctions such as failure of 'Auto' mode, inconsistent heating or cooling
  • Air-conditioning compressor may appear to fail
  • Exterior temperature display in instrument cluster or climate control head unit may malfunction

Common Causes

  • Poor connection or wiring damage between the sensor and ECM
  • Corrosion or water entry into the connector
  • Faulty ambient air temperature sensor due to physical damage from collision or road debris

Diagnosis

  1. Inspect and test the ambient air temperature sensor for resistance changes with a DVOM
  2. Check the wiring harness and connector for damage or corrosion
  3. Verify reference voltage and signal voltage at the AAT sensor

Fixes

  • Replace faulty ambient air temperature sensor, damaged wiring, or corroded connectors

FAQ

Can I drive with P0074?

Yes, but you may experience issues with the climate control system.

What causes P0074?

Common causes include poor connections, damaged wiring, or a faulty ambient air temperature sensor due to physical damage.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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