Ambient Air Temperature Sensor Circuit Intermittent
Intermittent issue with the Ambient Air Temperature (AAT) sensor circuit causing signal loss. The malfunction indicator light is on and temperature readings may be inaccurate.
What You Might Notice
- Malfunction Indicator Light illuminated
- Air conditioning performance issues
- Inaccurate outside temperature display
- Overhead console temperature reading errors
- Intermittent sensor signal loss
Most Common Causes
- 1
Faulty AAT Sensor
The ambient air temperature sensor is failing or providing intermittent signals.
- 2
Wiring Circuit Issues
Intermittent open or short in the AAT sensor signal circuit wiring harness.
- 3
Poor Electrical Connections
Loose, corroded, or damaged connectors at the sensor or PCM.
- 4
PCM Malfunction
Engine control module failure preventing proper sensor communication (rare).
How to Diagnose It
- 1
Check Faulty AAT Sensor — The ambient air temperature sensor is failing or providing intermittent signals.
- 2
Check Wiring Circuit Issues — Intermittent open or short in the AAT sensor signal circuit wiring harness.
- 3
Check Poor Electrical Connections — Loose, corroded, or damaged connectors at the sensor or PCM.
- 4
Check PCM Malfunction — Engine control module failure preventing proper sensor communication (rare).
How to Fix It
- 1
Replace AAT Sensor
Install a new ambient air temperature sensor in the designated location.
- 2
Inspect Wiring and Connectors
Check for damaged, corroded, or loose wiring and connectors in the AAT circuit.
- 3
Clean Electrical Connections
Clean corroded connector terminals and apply dielectric grease to restore proper contact.
- 4
Check PCM and Clear Fault
Diagnose PCM function and clear the trouble code after repairs are complete.
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