P2030 — Fuel Fired Heater Performance
The fuel-fired auxiliary heater is operating but not delivering the expected heat output within the calibrated time — flame sensor reports weak combustion, exhaust temperature does not rise, or coolant heating rate is below threshold.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Fuel fired heater
- Heater flame sensor
- Heater combustion chamber
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Combustion chamber sooted from short cycles
- Flame sensor degraded
Related codes
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.