P2029 moderate

Fuel Fired Heater Disabled

The P2029 code means the vehicle's onboard diagnostic system has detected: Fuel Fired Heater Disabled. This is a moderate severity code.

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Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
$300 - $1,200 (parts and labor)
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Common Symptoms

  • Check Engine Light on
  • Cabin heater not working in cold weather
  • Extended engine warm-up time
  • Reduced interior heating performance
  • Possible coolant temperature issues

Probable Causes (Ranked by Likelihood)

  • Faulty fuel-fired heater unit Very High
  • Fuel supply issue to heater High
  • Heater control module fault Moderate
  • Blocked heater exhaust Moderate
  • Wiring fault in heater circuit Low

Step-by-Step Diagnostic Procedure

  1. Confirm P2029 with scan tool and check heater status

  2. Inspect fuel supply line to the auxiliary heater

  3. Check heater exhaust pipe for blockage

  4. Test heater control module and wiring connections

Frequently Asked Questions

What does P2029 mean?

P2029 indicates the fuel-fired auxiliary heater has been disabled by the PCM, often due to a fault detected in the heater system, fuel supply, or exhaust routing.

Can I drive with a P2029 code?

You can drive short distances, but cabin heating may be inadequate in cold weather. The engine itself is not at risk.

How much does it cost to fix P2029?

Repairs range from $300 to $1,200 depending on whether the heater unit, fuel supply, or control module needs replacement.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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