Powertrain
generic / SAE
P2029
Fuel Fired Heater Disabled
The fuel-fired auxiliary heater (used to warm coolant or DEF on cold start) has been disabled by the control module — typically because of repeated start failures, low-voltage supply, or a self-protection condition.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number– / 29
Possible causes
- Heater glow plug failed high
- Low battery voltage triggered lockout medium
- Fuel supply starved — empty tank or pump weak medium
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–1200 €
- Estimated time: 1–4 h
- Component: fuel fired heater
- Component: heater glow plug
- Component: heater fuel pump
Sources
References
sae:J2012