AutoCodes – Generic – B144B

B144B Code - Run/Crank Power Relay Circuit

Quick Answer

The Body Control Module (BCM) controls the Ignition Main Relay (underhood) and the Ignition Main Relay (instrument panel left) through their control circuits by applying a voltage to the ignition run/crank relay coil control circuit. Common causes include Faulty Ignition Main Relay, Ignition Main Relay harness is open or shorted, Ignition Main Relay 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: B144B indicates Run/Crank Power Relay Circuit.
Common causes: Common causes include Faulty Ignition Main Relay, Ignition Main Relay harness is open or shorted, Ignition Main Relay 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 6,409

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 20, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B144B Description

The Body Control Module (BCM) controls the Ignition Main Relay (underhood) and the Ignition Main Relay (instrument panel left) through their control circuits by applying a voltage to the ignition run/crank relay coil control circuit. The Ignition Main Relay (underhood) and Ignition Main Relay (instrument panel left) are energized when the ignition switch is in the RUN or the CRANK position, or when a remote start is requested.
The Diagnostic Trouble Code (DTC) will be set when there is a fault in the Ignition Main Relay Circuit.

OBDII Code B144B - Run/Crank Power Relay Circuit - AutoCodes.com — B144B Code - Run/Crank Power Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B144B?

Faulty Ignition Main Relay
Ignition Main Relay harness is open or shorted
Ignition Main Relay circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B144B?

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 B144B 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 B144B code?

Need more information on how to fix the B144B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B144B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B144B Buick — Run/Crank Power Relay Circuit
B144B Cadillac — Run/Crank Power Relay Circuit
B144B Chevrolet — Run/Crank Power Relay Circuit
B144B GMC — Run/Crank Power Relay Circuit

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 B144B Code

1. What are the common symptoms of OBDII code B144B related to the Run/Crank Power Relay Circuit?

- Common symptoms include difficulty starting the vehicle, intermittent stalling, and potential loss of power while driving.

2. What are the typical causes of OBDII code B144B?

- The code is often triggered by issues with the run/crank power relay circuit, such as a faulty relay, damaged wiring, or poor connections.

3. How can I diagnose the problem causing OBDII code B144B?

- A thorough inspection of the run/crank power relay, wiring, and connections is recommended, along with using a diagnostic scanner to gather more information.

4. Can a DIY enthusiast repair OBDII code B144B at home?

- While some basic troubleshooting like checking connections and replacing a faulty relay can be done at home, complex wiring issues may require professional intervention.

5. Is it safe to continue driving with OBDII code B144B present?

- It is not recommended to ignore the code and continue driving, as it can lead to more severe issues like complete engine failure or safety hazards on the road.

6. How much does it typically cost to repair OBDII code B144B?

- The cost can vary depending on the exact cause of the code and whether you choose to repair it yourself or seek help from a mechanic. Budget for parts and labor accordingly.

7. Are there any preventive measures to avoid OBDII code B144B in the future?

- Regular vehicle maintenance, checking electrical components, and addressing any warning signs promptly can help prevent issues that trigger this code.

8. Can extreme weather conditions affect the likelihood of OBDII code B144B occurring?

- Yes, extreme temperatures or environmental factors can impact the performance of electrical components, potentially leading to problems with the run/crank power relay circuit.

9. How long does it typically take to repair OBDII code B144B?

- The repair time can vary depending on the complexity of the issue and your experience level. Simple fixes may take a few hours, while more intricate problems could require more time.

10. Will resetting the OBDII system clear OBDII code B144B permanently?

- Resetting the system may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to reappear. It's crucial to diagnose and address the root cause of the problem.