AutoCodes – GMC – B1451 GMC

B1451 GMC Code - Accessory Power Circuit

Quick Answer

The Keyless Entry Control Module provides backup controls for the ignition power circuit, through the control circuit, by applying voltage to the circuit. Common causes include Faulty Keyless Entry Control Module, Keyless Entry Control Module harness is open or shorted, Keyless Entry Control Module 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: B1451 GMC indicates Accessory Power Circuit.
Common causes: Common causes include Faulty Keyless Entry Control Module, Keyless Entry Control Module harness is open or shorted, Keyless Entry Control Module 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 2,518

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 Apr 12, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B1451 GMC Description

The Keyless Entry Control Module provides backup controls for the ignition power circuit, through the control circuit, by applying voltage to the circuit. The ignition power circuit is energized when the vehicle power mode is in Vehicle ON or Vehicle in Service Mode.

OBDII Code B1451 GMC - Accessory Power Circuit - AutoCodes.com — B1451 GMC Code - Accessory Power Circuit

What does this mean?

What are the Possible Causes of the DTC B1451 GMC?

Faulty Keyless Entry Control Module
Keyless Entry Control Module harness is open or shorted
Keyless Entry Control Module circuit poor electrical connection

How to Fix the DTC B1451 GMC?

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 does this mean?

Code Tech Notes

B1451 01 Accessory Power Circuit Short to Battery
B1451 02 Accessory Power Circuit Short to Ground
B1451 04 Accessory Power Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1451 GMC 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.

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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 B1451 GMC Code

1. What does OBDII code B1451 for GMC mean?

The B1451 code indicates a problem with the Accessory Power Circuit in a GMC vehicle.

2. What are common symptoms of OBDII code B1451 in a GMC?

Common symptoms of code B1451 may include issues with power accessories, such as power windows, power locks, or other electrical components not functioning properly.

3. What are possible causes of OBDII code B1451 in a GMC?

Possible causes of code B1451 include a faulty accessory power relay, damaged wiring in the accessory power circuit, or a malfunctioning accessory power control module.

4. How can I diagnose OBDII code B1451 in my GMC?

Diagnosing code B1451 typically involves using a diagnostic scanner to retrieve the trouble codes, inspecting the accessory power circuit for any visible damage, and testing the components related to the circuit.

5. How can I repair OBDII code B1451 in a GMC?

Repairing code B1451 may involve replacing a faulty accessory power relay, repairing damaged wiring in the circuit, or replacing a malfunctioning accessory power control module.

6. Can I drive my GMC with OBDII code B1451?

It is generally not recommended to drive your GMC with an unresolved B1451 code, as it may lead to further electrical problems or safety issues.

7. How much does it cost to fix OBDII code B1451 in a GMC?

The cost of fixing code B1451 in a GMC can vary depending on the specific cause of the issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

8. Can I reset OBDII code B1451 in my GMC without repairing the issue?

While you can clear the code using a diagnostic scanner, it is not recommended to reset the code without addressing the underlying problem, as it will likely reappear.

9. Are there any recalls related to OBDII code B1451 in GMC vehicles?

There are no known recalls specifically related to OBDII code B1451 in GMC vehicles, but it's always a good idea to check with the manufacturer for any updates.

10. How can I prevent OBDII code B1451 from appearing in my GMC?

To prevent code B1451, it's important to perform regular maintenance on your vehicle, address any electrical issues promptly, and avoid overloading the accessory power circuit with aftermarket accessories.