AutoCodes – GMC – B153B GMC

B153B GMC Code - Liftgate Open Switch Signal Circuit

Quick Answer

The full open switch is part of the gear motor assembly and will close and become active when the liftgate reaches the full open position. Common causes include Faulty Liftgate Motor Assembly, Liftgate Motor Assembly harness is open or shorted, Liftgate Motor Assembly 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: B153B GMC indicates Liftgate Open Switch Signal Circuit.
Common causes: Common causes include Faulty Liftgate Motor Assembly, Liftgate Motor Assembly harness is open or shorted, Liftgate Motor Assembly 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 4,867

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 May 02, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B153B GMC Description

The full open switch is part of the gear motor assembly and will close and become active when the liftgate reaches the full open position. The full open switch signal circuit is supplied battery voltage through a resistor and monitored within the Liftgate Control Module (LGM). The Liftgate Control Module provides a low reference circuit and when the switch contacts close, the signal circuit goes low and the LGM determines the switch to be active.

OBDII Code B153B GMC - Liftgate Open Switch Signal Circuit - AutoCodes.com — B153B GMC Code - Liftgate Open Switch Signal Circuit

What does this mean?

What are the Possible Causes of the DTC B153B GMC?

Faulty Liftgate Motor Assembly
Liftgate Motor Assembly harness is open or shorted
Liftgate Motor Assembly circuit poor electrical connection
Faulty Liftgate Control Module (LGM)

How to Fix the DTC B153B 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

B153B 02 Liftgate Open Switch Signal Circuit Short to Ground
B153B 05 Liftgate Open Switch Signal Circuit Open

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B153B 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 B153B GMC Code

1. What does the OBDII code B153B on a GMC vehicle mean?

The B153B code indicates an issue with the liftgate open switch signal circuit, such as a malfunction or fault in the wiring or switch.

2. What are the common symptoms of the B153B code on a GMC?

Symptoms include the liftgate not opening or closing properly, erroneous "liftgate open" warnings on the dashboard, or the liftgate switch being unresponsive.

3. What causes the B153B code on a GMC vehicle?

Common causes include a faulty liftgate open switch, damaged or corroded wiring, loose electrical connections, or an issue with the body control module (BCM).

4. Can I still drive my GMC with the B153B code active?

Yes, you can still drive your vehicle, but the liftgate function may be limited or inoperative, which could be inconvenient.

5. How do I diagnose the B153B code on my GMC?

Start by inspecting the liftgate switch and wiring for damage or corrosion. Use a scan tool to check for additional codes and test the functionality of the switch.

6. How can the B153B code be fixed on a GMC vehicle?

Repairs may include replacing the liftgate open switch, repairing or replacing damaged wiring, cleaning corroded connections, or reprogramming the BCM if necessary.

7. How much does it cost to fix a B153B code on a GMC?

The cost depends on the root cause but typically ranges from $50 to $300, depending on whether the switch or wiring needs repair or replacement.

8. Can a faulty liftgate open switch cause the B153B code?

Yes, a malfunctioning liftgate open switch is one of the most common causes of this code.

9. Does clearing the code fix the B153B issue permanently?

Clearing the code may temporarily remove the warning, but the issue will persist if the underlying problem isn't resolved.

10. Is a professional mechanic necessary to fix the B153B code on a GMC?

While some repairs, like inspecting and replacing a switch, can be done by experienced DIYers, more complex issues involving wiring or the BCM may require a professional mechanic.