AutoCodes – GMC – B144C GMC

B144C GMC Code - Inverted Run/Start Power Relay Circuit

Quick Answer

The vehicle theft deterrent subsystem provides the capability to lock or unlock the steering column electrically. Common causes include Faulty Inverted Run/Start Power Relay, Inverted Run/Start Power Relay harness is open or shorted, Inverted Run/Start Power 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: B144C GMC indicates Inverted Run/Start Power Relay Circuit.
Common causes: Common causes include Faulty Inverted Run/Start Power Relay, Inverted Run/Start Power Relay harness is open or shorted, Inverted Run/Start Power 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 3,468

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 B144C GMC Description

The vehicle theft deterrent subsystem provides the capability to lock or unlock the steering column electrically. The Steering Column Lock Module is allowed to unlock when power mode transitions to a non off power mode and an authenticated driver identification device is present. Once the column is unlocked, a crank request can be allowed.

OBDII Code B144C GMC - Inverted Run/Start Power Relay Circuit - AutoCodes.com — B144C GMC Code - Inverted Run/Start Power Relay Circuit

What does this mean?

What are the Possible Causes of the DTC B144C GMC?

Faulty Inverted Run/Start Power Relay
Inverted Run/Start Power Relay harness is open or shorted
Inverted Run/Start Power Relay circuit poor electrical connection
Faulty Steering Column Lock Module

How to Fix the DTC B144C 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

B144C 01 Inverted Run/Start Power Relay Circuit Short to Battery
B144C 06 Inverted Run/Start Power Relay Circuit Low Voltage/Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B144C 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 B144C GMC Code

What does the OBDII code B144C on a GMC indicate?

The code B144C on a GMC indicates an issue with the Inverted Run/Start Power Relay Circuit, suggesting a malfunction in the relay or its control circuit.

What are common symptoms of code B144C in a GMC?

Symptoms of the B144C code may include an engine that won't start, intermittent issues with starting the vehicle, or the start/stop feature not working correctly.

What can cause the B144C code to appear on my GMC?

Possible causes for the B144C code include a faulty run/start power relay, wiring issues in the relay circuit (like shorts or opens), or problems with the relay control module.

How do I diagnose the B144C code on a GMC?

Diagnosing the B144C code involves checking the run/start power relay for proper operation, inspecting the associated wiring and connectors for damage, and testing the relay control module if applicable.

What steps should I take to fix the B144C code on my GMC?

To fix the B144C code, replace the faulty run/start power relay if it's malfunctioning, repair any damaged wires or connectors in the relay circuit, and check for software updates for the relay control module that might resolve the issue.

Is it safe to drive my GMC with the B144C code?

While it might be safe to drive for a short distance, driving with the B144C code can lead to issues such as the vehicle not starting. It is advisable to address the problem promptly to avoid being stranded.

How urgent is it to repair a B144C code on a GMC?

It is quite urgent to repair a B144C code on a GMC because it directly affects the vehicleâ€™s ability to start and run. Delaying repairs can lead to further complications with the vehicle's electrical system.

Can the B144C code affect the battery performance on my GMC?

Yes, the B144C code could potentially affect battery performance if the start/stop feature is malfunctioning, leading to unnecessary battery drain. Addressing the issue promptly is important to maintain battery health.