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Engine-Codes – GMC – B144B 2017 GMC Sierra

B144B 2017 GMC Sierra Code - Run/Crank Power Relay Circuit

Quick Answer

The B144B diagnostic trouble code (DTC) for a 2017 GMC Sierra pertains to the Run/Crank Power Relay Circuit. Common causes include Damaged or corroded wiring in the power relay circuit, Faulty power relay, Malfunctioning ignition switch. 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 2017 GMC Sierra indicates Run/Crank Power Relay Circuit.
Common causes
Common causes include Damaged or corroded wiring in the power relay circuit, Faulty power relay, Malfunctioning ignition switch.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code B144B 2017 GMC Sierra Description

The B144B diagnostic trouble code (DTC) for a 2017 GMC Sierra pertains to the Run/Crank Power Relay Circuit. This code indicates a problem with the electrical circuit that controls the power relay responsible for supplying power to the vehicle's ignition and starting system. The power relay is crucial for initiating the engine's cranking process and ensuring that the necessary power is delivered to various components during startup.

OBDII Code B144B 2017 GMC Sierra - Run/Crank Power Relay Circuit
B144B 2017 GMC Sierra Code - Run/Crank Power Relay Circuit

Common Causes of B144B 2017 GMC Sierra

  1. Damaged or corroded wiring in the power relay circuit
  2. Faulty power relay
  3. Malfunctioning ignition switch
  4. Issues with the engine control module (ECM)
  5. Poor electrical connections or loose wiring

Symptoms of B144B 2017 GMC Sierra

  1. Engine cranks but does not start
  2. Intermittent starting issues
  3. Engine stalling while driving
  4. Inability to start the vehicle at all

How to Fix B144B 2017 GMC Sierra

  1. Begin by conducting a thorough inspection of the power relay circuit, checking for any damaged or corroded wiring. Repair or replace any faulty wiring as needed.
  2. Test the power relay using a multimeter to ensure it is functioning correctly. Replace the relay if it is found to be faulty.
  3. Inspect the ignition switch for any signs of wear or malfunction. Replace the ignition switch if necessary.
  4. If the issue persists, diagnose the ECM for any faults or errors. Replace or reprogram the ECM as needed.
  5. Finally, clear the DTC from the vehicle's computer system and test the vehicle to ensure that the issue has been resolved.

Cost to Fix B144B 2017 GMC Sierra

** The typical repair costs for addressing the B144B code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a power relay or repairing wiring may cost between $100 to $300, while replacing an ignition switch or ECM could range from $200 to $500 or more. Labor costs at auto repair shops typically range from $80 to $150 per hour, so the total repair bill may add up based on the complexity of the repair and the shop's rates. It is advisable to consult with a trusted mechanic for a more accurate cost estimate based on the specific diagnosis and repair needed for your vehicle.

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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 B144B 2017 GMC Sierra Code

1. What is OBDII code B144B on a 2017 GMC Sierra?

Code B144B indicates a problem with the Run/Crank Power Relay Circuit, suggesting an issue in the electrical path that controls the vehicle's ability to engage the starter motor during the run or crank phase.

2. What symptoms might I notice if my 2017 GMC Sierra has the B144B code?

Symptoms can include the engine not starting, the starter not engaging, or the vehicle stalling shortly after starting. You might also notice general electrical issues or the check engine light may illuminate.

3. What are common causes of the B144B code in a 2017 GMC Sierra?

Common causes include a faulty relay, issues with the relay control circuit such as frayed or broken wires, poor relay connections, or problems with the fuse related to this circuit.

4. How can I diagnose the B144B code on my 2017 GMC Sierra?

Diagnosing this code typically involves checking the run/crank relay for damage or malfunction, inspecting the relay socket and connections for corrosion or looseness, and testing the continuity and voltage in the relay circuit with a multimeter.

5. What steps should be taken to fix code B144B in a 2017 GMC Sierra?

Repair steps may include replacing the faulty run/crank relay, repairing or replacing damaged wiring within the circuit, ensuring all connections are clean and secure, and replacing any blown fuses.

6. Is it safe to drive my 2017 GMC Sierra with the B144B code active?

Driving with this code active is not recommended as it can lead to situations where your vehicle may not start or could stall while driving, potentially causing safety issues.

7. Can a B144B code drain the battery on my 2017 GMC Sierra?

Yes, if the run/crank relay is stuck in the "on" position, it can lead to continuous power draw, which may drain the battery.

8. What tools are required to diagnose and repair the B144B code on a 2017 GMC Sierra?

Tools needed may include a multimeter for testing electrical components, a basic set of hand tools for accessing the relay and circuit, and possibly a scan tool for deeper diagnostic analysis.

9. How urgent is it to address the B144B code in a 2017 GMC Sierra?

Addressing this code should be considered urgent, as failing to do so can result in your vehicle not starting or experiencing serious operational issues.

10. Could ignoring the B144B code lead to other issues in my 2017 GMC Sierra?

Ignoring this issue can lead to increased strain on other starting and electrical system components, potentially causing further damage or failures in associated systems.

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