AutoCodes – Generic – P2029

P2029 Code - Fuel Fired Heater Disabled

Quick Answer

The Fuel Fired Heater can be disabled due to electrical malfunctions resulting in dangerous circuit conditions. Common causes include Faulty Oxygen Sensor, Oxygen Sensor harness is open or shorted, Oxygen Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P2029 indicates Fuel Fired Heater Disabled.
Common causes: Common causes include Faulty Oxygen Sensor, Oxygen Sensor harness is open or shorted, Oxygen Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 12,557

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 22, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2029 Description

The Fuel Fired Heater can be disabled due to electrical malfunctions resulting in dangerous circuit conditions. A meter can be used to validate the operation of the electrical circuit. This Diagnostic Trouble Code (DTC) can be caused by a faulty oxygen sensor, a faulty wiring harness, and/or a leaking crankcase ventilation hose.

OBDII Code P2029 - Fuel Fired Heater Disabled - AutoCodes.com — P2029 Code - Fuel Fired Heater Disabled

What does this mean?

What are the Possible Causes of the DTC P2029?

Faulty Oxygen Sensor
Oxygen Sensor harness is open or shorted
Oxygen Sensor circuit poor electrical connection
Leaking Crankcase Ventilation Hose

How to Fix the DTC P2029?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2029 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P2029 code?

Need more information on how to fix the P2029 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2029 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P2029 Dodge — Fuel Fired Heater Disabled
P2029 Mercedes-Benz — Fuel Fired Heater Disabled

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.