OBD-II Generic Error Code P2029: How to Fix It

Q: Can I drive my car with error code P2029?

Yes, you can usually drive the vehicle, but the fuel fired heater will not operate, which may reduce cabin or engine heating. In cold climates, this could lead to engine performance issues, so repair is recommended promptly.

Q: Will error P2029 affect my fuel economy?

Typically, no. The code only disables the heater, which is not directly related to fuel economy. However, if the heater is used to warm the engine for better combustion, you may see a slight decrease in fuel efficiency in very cold weather.

Q: What is a fuel fired heater?

A fuel fired heater is an auxiliary heating device that burns diesel or gasoline to heat the engine coolant or cabin air, often used in diesel vehicles or vehicles for cold climates to provide rapid heat without idling the engine.

Q: How much does it cost to fix error P2029?

Costs vary widely: replacing a fuel filter may cost $20-50 DIY, while a new heater unit could run $200-500 plus labor. Diagnostic fees at a shop may be $100-200.

Q: Can a faulty thermostat cause P2029?

No, P2029 specifically relates to the fuel fired heater system, not the engine thermostat. However, a coolant temperature sensor issue may trigger related codes that could lead to heater disablement.

Abstract

Error code P2029 indicates that the fuel fired heater (often a coolant or cabin heater powered by fuel) has been disabled by the vehicle's computer. This can lead to reduced heating performance, especially in cold weather. The cause may be a failed heater unit, a blocked exhaust, low fuel pressure, or a faulty control module.