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Detroit DD13 EPA10 (2010-13) Fault Code: SPN 171 FMI 3 (ACM) Ambient Air Temperature Circuit Failed High

NOTE: Please see the step by step troubleshooting procedures for this specific code.

PROBABLE CAUSES:
1. Ambient air temperature sensor not programmed correctly in ECM.
2. Ambient air temperature sensor connector/harness.
3. Ambient air temperature sensor.