Cause
Failed intake air heater element
The grid heater warming intake air for a cold diesel start. It draws very high current, so its failure is often preceded by the relay it works through — and the symptom is seasonal, appearing as hard cold starting and white smoke only in winter.
Typically a moderate job.
Codes this can cause (9)
Codes where this is a likely explanation first, rather than merely a possible one.
- P0540 Intake Air Heater A Circuit Likely for this code Low
- P0542 Intake Air Heater A Circuit High Likely for this code Low
- P0543 Intake Air Heater A Circuit Open Likely for this code Low
- P2604 Intake Air Heater A Circuit Range/Performance Likely for this code Moderate
- P2605 Intake Air Heater B Circuit/Open Likely for this code Moderate
- P2606 Intake Air Heater B Circuit Range/Performance Likely for this code Moderate
- P2608 Intake Air Heater B Circuit High Likely for this code Moderate
- P2609 Intake Air Heater System Performance Likely for this code Moderate
- P0541 Intake Air Heater A Circuit Low Low
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