P2029Fuel Fired Heater Disabled
- Generic OBD-II code · Powertrain
- Matters for the ITP
- How the car detects it
- A fuel fired heater burns a small amount of the vehicle's fuel to warm coolant or cabin air, a common add-on on diesels with little waste heat. P2029 is a state code: the controller has taken the heater out of service, usually after repeated failed starts, flame-outs, overheating or an electrical fault. CARB counts fuel-fired passenger heaters among other emission sources for which each maker must get its own monitoring plan approved. No manufacturer documents P2029 publicly. Webasto's Air Top Evo shows the pattern: no start, flame loss, overheating and glow plug faults have their own codes, and after too many failures the heater locks out until a workshop releases it. So the real fault, often logged alongside as P2030 or a circuit code, has to be fixed before the lock is cleared. The engine runs normally; the cabin stays cold.
- What you may notice
- Little or no auxiliary heat, slow warm-up
- Heater does not start when requested
- Warning lamp depends on the manufacturer
- Likely causes
- LikelyLock-out after repeated failed starts or flame-outs (fuel supply, glow plug, combustion air)
- PossibleHeater shut down after overheating, e.g. low coolant flow
- PossibleSupply voltage too low or wiring fault to the heater
- Inspection (ITP)
- Can matter for the ITP: it concerns the emissions system.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.