Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.
Possible causes:
1)A shorted intake air heater relay
2)Intake air heater relay supply wire shorted to ground.
Possible repairs:
1)Replace the intake air heater relay.
2)Repair or replace the OEM harness.
3)Replace the ECM.
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