B144B 2015 GMC Sierra 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 2015 GMC Sierra 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.
Code B144B 2015 GMC Sierra Description
The Diagnostic Trouble Code (DTC) will be set when there is a fault in the Ignition Main Relay Circuit.
What are the Possible Causes of the DTC B144B 2015 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 B144B 2015 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 B144B 2015 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 B144B 2015 GMC Sierra Code
1. What does the OBDII code B144B mean on a 2015 GMC Sierra?
B144B indicates an issue with the Run/Crank Power Relay Circuit, which is responsible for providing power during engine startup and operation.
2. What are the symptoms of a B144B code on a 2015 GMC Sierra?
Common symptoms include difficulty starting the engine, intermittent stalling, or the vehicle not starting at all.
3. What causes the B144B code to appear?
The code can be triggered by a faulty Run/Crank Power Relay, damaged wiring or connectors in the circuit, or issues with the body control module (BCM).
4. How is the B144B code diagnosed?
Technicians typically inspect the relay, wiring, and connectors for damage or corrosion, use a multimeter to check circuit continuity, and may test the BCM for proper function.
5. Can I still drive my 2015 GMC Sierra with a B144B code?
It’s not recommended, as the vehicle may stall or fail to start, leaving you stranded. Immediate diagnosis and repair are advised.
6. How do I fix the B144B code on my 2015 GMC Sierra?
Repairs may involve replacing the Run/Crank Power Relay, repairing damaged wiring or connectors, or reprogramming or replacing the BCM if it’s determined to be faulty.
7. Where is the Run/Crank Power Relay located on a 2015 GMC Sierra?
The relay is typically located in the under-hood fuse box or relay panel. Consult your owner’s manual for the exact location.
8. What tools are needed to troubleshoot a B144B code?
You’ll need a multimeter, a scan tool capable of reading body control module codes, and potentially wiring diagrams for the Run/Crank Power Relay Circuit.
9. How much does it cost to repair the B144B code on a 2015 GMC Sierra?
Repair costs can range from $50 to $300, depending on whether the issue is a simple relay replacement or involves more extensive wiring or BCM repairs.
10. Can a dead battery cause the B144B code to appear?
A weak or dead battery can contribute to electrical issues, but the code specifically points to a fault in the Run/Crank Power Relay Circuit, which should be inspected for other underlying problems.
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