B144A 2018 GMC Sierra Code - Run Power Relay Circuit
Quick Answer
The Body Control Module (BCM) feeds the ignition circuit by applying voltage when the ignition is in the ON position. 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
- B144A 2018 GMC Sierra indicates Run 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.
Code B144A 2018 GMC Sierra Description
What are the Possible Causes of the DTC B144A 2018 GMC Sierra?
- 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 B144A 2018 GMC Sierra?
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 B144A 2018 GMC Sierra 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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Frequently Asked Questions about B144A 2018 GMC Sierra Code
1. What does the OBDII code B144A mean on a 2018 GMC Sierra?
The B144A code refers to a fault in the Run Power Relay Circuit, indicating an issue with the relay responsible for powering certain vehicle systems during operation.
2. What are the symptoms of the B144A code in a 2018 GMC Sierra?
Symptoms may include electrical components like the radio, HVAC system, or dashboard not functioning, intermittent power loss, or the vehicle failing to start.
3. What causes the B144A code to appear on a 2018 GMC Sierra?
Common causes include a faulty run power relay, damaged wiring or connectors in the circuit, or a malfunctioning control module.
4. How can I diagnose the B144A code on my 2018 GMC Sierra?
Use a diagnostic scanner to confirm the code, inspect the run power relay for proper function, and check the wiring and connectors for signs of damage or corrosion.
5. Can a bad run power relay cause the vehicle not to start?
Yes, a faulty run power relay can prevent power from reaching essential systems, potentially causing the vehicle not to start.
6. Is the B144A code in a 2018 GMC Sierra dangerous to drive with?
It depends on the severity of the issue. If critical systems lose power, it can affect drivability and safety. It’s best to address the problem promptly.
7. How do I fix the B144A code on a 2018 GMC Sierra?
Repairs may include replacing the run power relay, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the control module.
8. Where is the run power relay located in a 2018 GMC Sierra?
The run power relay is typically located in the under-hood fuse box. Refer to the owner’s manual for its exact location.
9. How much does it cost to repair the B144A code on a 2018 GMC Sierra?
Repair costs can vary, but replacing a run power relay typically costs $50–$150, with additional costs for wiring repairs or module replacement if needed.
10. Can I reset the B144A code without fixing the problem?
Clearing the code with a diagnostic scanner may temporarily remove it, but if the underlying issue isn’t resolved, the code will likely return.
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