AutoCodes – GMC – U154A GMC

U154A GMC Code - Body Control Module Lost Communication With Right Rear Window Switch On LIN Bus

Quick Answer

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. Common causes include Faulty Right Rear Window Switch, Right Rear Window Switch harness is open or shorted, Right Rear Window Switch 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: U154A GMC indicates Body Control Module Lost Communication With Right Rear Window Switch On LIN Bus.
Common causes: Common causes include Faulty Right Rear Window Switch, Right Rear Window Switch harness is open or shorted, Right Rear Window Switch 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 2,040

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 Jun 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U154A GMC Description

The Local Interconnect Network (LIN) Bus consists of a single wire with a transmission rate of 10.417 Kbit/s. The serial data is transmitted over a LIN circuit between a master control module and other LIN devices within a particular subsystem. If serial data communication is lost between any of the LIN devices on the LIN bus network, the master control module will set a no communication code against the non-communicating LIN device. The Diagnostic Trouble Code (DTC) will set when a supervised periodic message to the Body Control Module (BCM) from the Right Rear Window Switch has not been received.

OBDII Code U154A GMC - Body Control Module Lost Communication With Right Rear Window Switch On LIN Bus - AutoCodes.com — U154A GMC Code - Body Control Module Lost Communication With Right Rear Window Switch On LIN Bus

What does this mean?

What are the Possible Causes of the DTC U154A GMC?

Faulty Right Rear Window Switch
Right Rear Window Switch harness is open or shorted
Right Rear Window Switch circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC U154A 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U154A 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 U154A GMC Code

1. What are the common symptoms of OBDII code U154A in a GMC related to the Body Control Module losing communication with the right rear window switch on the LIN bus?

- Common symptoms include the right rear window becoming inoperative, the window switch not responding, and the inability to control the right rear window from the driver's side.

2. What are the possible causes of OBDII code U154A GMC related to the Body Control Module communication issue with the right rear window switch on the LIN bus?

- Possible causes may include a faulty right rear window switch, damaged wiring harness, a defective Body Control Module, or issues with the LIN bus communication network.

3. How can I diagnose the OBDII code U154A in a GMC when the Body Control Module loses communication with the right rear window switch on the LIN bus?

- Diagnosis involves using a scan tool to retrieve the trouble code, inspecting the wiring harness for any visible damage, testing the right rear window switch, and checking the LIN bus communication network for faults.

4. What are some repair tips for resolving OBDII code U154A GMC related to the Body Control Module issue with the right rear window switch on the LIN bus?

- Repair tips may include repairing or replacing any damaged wiring, testing and replacing the right rear window switch if necessary, reprogramming or replacing the Body Control Module, and ensuring proper communication on the LIN bus network.

5. Is it safe to continue driving my GMC with OBDII code U154A indicating communication loss between the Body Control Module and the right rear window switch on the LIN bus?

- It is not recommended to drive the vehicle with this issue as it may lead to further electrical problems or safety concerns. It is advisable to address the problem promptly to ensure proper functionality of the right rear window and related systems.

6. Can OBDII code U154A GMC be reset without fixing the underlying issue of communication loss between the Body Control Module and the right rear window switch on the LIN bus?

- Resetting the code without addressing the root cause will likely lead to the code reappearing once the system detects the ongoing communication problem. It is essential to diagnose and repair the issue to prevent recurring trouble codes.

7. Are there any recalls or technical service bulletins (TSBs) related to OBDII code U154A GMC and the Body Control Module communication issue with the right rear window switch on the LIN bus?

- It is advisable to check with a GMC dealership or refer to online databases for any recalls or TSBs related to this specific OBDII code. Manufacturers may release relevant information to assist in diagnosing and repairing such issues.

8. How much does it typically cost to repair OBDII code U154A GMC caused by communication loss between the Body Control Module and the right rear window switch on the LIN bus?

- The repair costs can vary depending on the exact cause of the issue, labor rates, and the need for replacement parts. It is recommended to obtain a diagnostic assessment from a qualified mechanic to determine the specific repair expenses.

9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code U154A GMC related to the Body Control Module losing communication with the right rear window switch on the LIN bus?

- While some simple troubleshooting steps can be performed by DIY enthusiasts, resolving complex electrical issues like this code may require advanced diagnostic tools and expertise. It is recommended to consult a professional mechanic for proper repair and maintenance.

10. How long does it take to repair OBDII code U154A GMC associated with the Body Control Module communication problem with the right rear window switch on the LIN bus?

- The repair duration can vary based on the extent of the issue, the availability of parts, and the mechanic's workload. Simple fixes may take a few hours, while more complex repairs could require a day or more to complete.