AutoCodes – Generic – B2449

B2449 Code - Auxiliary Heater Glow Plug Circuit Short to Ground

Quick Answer

The Powertrain Control Module (PCM) monitors the Auxiliary Heater Glow Plug. Common causes include Faulty Auxiliary Heater Glow Plug, Auxiliary Heater Glow Plug harness is open or shorted, Auxiliary Heater Glow Plug 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: B2449 indicates Auxiliary Heater Glow Plug Circuit Short to Ground.
Common causes: Common causes include Faulty Auxiliary Heater Glow Plug, Auxiliary Heater Glow Plug harness is open or shorted, Auxiliary Heater Glow Plug 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 4,742

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 Dec 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2449 Description

The Powertrain Control Module (PCM) monitors the Auxiliary Heater Glow Plug. The PCM sets the OBDII code when the Auxiliary Heater Glow Plug is not to factory specifications.

OBDII Code B2449 - Auxiliary Heater Glow Plug Circuit Short to Ground - AutoCodes.com — B2449 Code - Auxiliary Heater Glow Plug Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B2449?

Faulty Auxiliary Heater Glow Plug
Auxiliary Heater Glow Plug harness is open or shorted
Auxiliary Heater Glow Plug circuit poor electrical connection

How to Fix the DTC B2449?

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 B2449 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 B2449 code?

Need more information on how to fix the B2449 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2449 code diagnosed by a professional: Find a repair shop in your area

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.

Frequently Asked Questions about B2449 Code

1. What are the common symptoms of OBDII code B2449 (Auxiliary Heater Glow Plug Circuit Short to Ground)?

- Common symptoms include difficulty starting the vehicle, rough idle, decreased fuel efficiency, and the glow plug indicator light turning on.

2. What are the possible causes of OBDII code B2449?

- The code B2449 can be caused by a short to ground in the auxiliary heater glow plug circuit, a faulty glow plug, a damaged wiring harness, or a defective glow plug control module.

3. How can I diagnose OBDII code B2449?

- Diagnosing code B2449 involves inspecting the glow plugs, checking the wiring for any damage or short circuits, and using a multimeter to test for continuity and resistance in the glow plug circuit.

4. Can I still drive my vehicle with OBDII code B2449?

- It is not recommended to drive your vehicle with code B2449, as it can lead to further damage to the glow plug system and affect the performance of the engine.

5. How can I repair OBDII code B2449?

- Repairing code B2449 typically involves replacing the faulty glow plug, repairing or replacing any damaged wiring, and resetting the fault codes with an OBDII scanner.

6. Are there any DIY tips for fixing code B2449?

- DIY tips for fixing code B2449 include checking the glow plug connections for corrosion, ensuring proper insulation of the wiring harness, and testing the glow plugs individually with a multimeter.

7. How much does it cost to repair OBDII code B2449?

- The cost of repairing code B2449 can vary depending on the extent of the damage and the specific components that need to be replaced. It is recommended to consult with a professional mechanic for an accurate estimate.

8. Can a faulty glow plug cause OBDII code B2449?

- Yes, a faulty glow plug can cause code B2449 if it creates a short to ground in the auxiliary heater glow plug circuit.

9. What is the purpose of the auxiliary heater glow plug circuit in a vehicle?

- The auxiliary heater glow plug circuit is responsible for preheating the combustion chamber in diesel engines to facilitate easier cold starts and improve overall engine performance.

10. How can I prevent OBDII code B2449 from occurring in the future?

- To prevent code B2449, it is important to perform regular maintenance on the glow plug system, keep the wiring harness in good condition, and address any issues with the glow plugs promptly.