AutoCodes – Generic – B2451

B2451 Code - Auxiliary Heater Fuel Pump Circuit Short to Ground

Quick Answer

The Powertrain Control Module (PCM) monitors the Auxiliary Heater Fuel Pump. Common causes include Faulty Auxiliary Heater Fuel Pump, Auxiliary Heater Fuel Pump harness is open or shorted, Auxiliary Heater Fuel Pump 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: B2451 indicates Auxiliary Heater Fuel Pump Circuit Short to Ground.
Common causes: Common causes include Faulty Auxiliary Heater Fuel Pump, Auxiliary Heater Fuel Pump harness is open or shorted, Auxiliary Heater Fuel Pump 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 4,520

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 B2451 Description

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

OBDII Code B2451 - Auxiliary Heater Fuel Pump Circuit Short to Ground - AutoCodes.com — B2451 Code - Auxiliary Heater Fuel Pump Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B2451?

Faulty Auxiliary Heater Fuel Pump
Auxiliary Heater Fuel Pump harness is open or shorted
Auxiliary Heater Fuel Pump circuit poor electrical connection

How to Fix the DTC B2451?

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 B2451 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 B2451 code?

Need more information on how to fix the B2451 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2451 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 B2451 Code

1. What are the common symptoms of OBDII code B2451 (Auxiliary Heater Fuel Pump Circuit Short to Ground)?

The common symptoms include failure of the auxiliary heater fuel pump to operate, issues with the heater system, and potential illumination of the check engine light.

2. What are the possible causes of OBDII code B2451?

Possible causes include a short circuit to ground in the auxiliary heater fuel pump circuit, damaged wiring or connectors, a faulty fuel pump, or a malfunctioning control module.

3. How can I diagnose OBDII code B2451?

To diagnose this code, you can use a diagnostic scanner to read the code and access the vehicle's onboard computer system for further troubleshooting. Inspecting the wiring, connectors, and components related to the auxiliary heater fuel pump is also recommended.

4. What are the repair options for OBDII code B2451?

Repair options may include repairing or replacing damaged wiring or connectors, replacing the faulty fuel pump, or addressing any issues with the control module. Ensuring all connections are secure and functioning properly is essential.

5. Can OBDII code B2451 be fixed without professional help?

While some DIY enthusiasts may be able to address this code on their own by following repair guides or manuals, seeking professional help from a qualified mechanic or technician is recommended for an accurate diagnosis and effective repair.

6. Is it safe to continue driving with OBDII code B2451 present?

It is not recommended to continue driving with this code present, as it may indicate a potential issue with the auxiliary heater fuel pump circuit, which can affect the vehicle's heating system and overall performance.

7. How urgent is it to address OBDII code B2451?

It is advisable to address this code promptly to prevent further damage to the auxiliary heater fuel pump circuit and ensure the proper functioning of the heater system in your vehicle.

8. Can extreme weather conditions contribute to triggering OBDII code B2451?

Yes, extreme cold weather conditions or prolonged use of the auxiliary heater may contribute to issues with the fuel pump circuit, leading to the triggering of this specific OBDII code.

9. Are there any preventive measures to avoid OBDII code B2451 in the future?

Regular maintenance checks, including inspecting the auxiliary heater system, fuel pump circuit, and related components, can help prevent issues that may trigger OBDII code B2451.

10. How much can I expect to pay for repairs related to OBDII code B2451?

The cost of repairs for this OBDII code can vary depending on the extent of the issue, the parts needed for replacement, and the labor charges. It is recommended to obtain quotes from different repair shops for a better understanding of the potential costs involved.