AutoCodes – GMC – U0155 GMC

U0155 GMC Code - Lost Communication With Instrument Panel Cluster Control Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Instrument Panel Cluster Control Module, Instrument Panel Cluster Control Module harness is open or shorted, Instrument Panel Cluster Control Module 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: U0155 GMC indicates Lost Communication With Instrument Panel Cluster Control Module.
Common causes: Common causes include Faulty Instrument Panel Cluster Control Module, Instrument Panel Cluster Control Module harness is open or shorted, Instrument Panel Cluster Control Module 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 4,122

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 01, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0155 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Instrument Panel Cluster Control Module has not been received.

OBDII Code U0155 GMC - Lost Communication With Instrument Panel Cluster Control Module - AutoCodes.com — U0155 GMC Code - Lost Communication With Instrument Panel Cluster Control Module

What does this mean?

What are the Possible Causes of the DTC U0155 GMC?

Faulty Instrument Panel Cluster Control Module
Instrument Panel Cluster Control Module harness is open or shorted
Instrument Panel Cluster Control Module circuit poor electrical connection

How to Fix the DTC U0155 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 U0155 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 U0155 GMC Code

1. What are the common symptoms of OBDII code U0155 in a GMC vehicle?

- Common symptoms include issues with the instrument cluster display, malfunctioning gauges, warning lights staying on, and loss of communication with the instrument panel.

2. What causes the OBDII code U0155 in a GMC vehicle?

- The code U0155 is typically caused by a communication failure between the vehicle's ECM and the instrument panel cluster control module.

3. How can I diagnose the OBDII code U0155 in my GMC vehicle?

- Diagnosis involves using a scan tool to check for the U0155 code, inspecting wiring connections, and testing the instrument panel cluster control module for proper functionality.

4. Can a faulty battery or alternator cause the OBDII code U0155 to appear in a GMC vehicle?

- Yes, a weak battery or faulty alternator can sometimes lead to communication errors between modules and trigger the U0155 code.

5. What are some repair tips for fixing the OBDII code U0155 in a GMC vehicle?

- Repair tips include checking and repairing any damaged wiring, ensuring proper ground connections, and potentially replacing the instrument panel cluster control module if necessary.

6. Is it safe to continue driving my GMC vehicle with the OBDII code U0155 present?

- It is generally not recommended to drive the vehicle with the U0155 code active, as it can affect the proper functioning of the instrument cluster and other critical systems.

7. Can a software update or reprogramming fix the OBDII code U0155 in a GMC vehicle?

- Sometimes, a software update or reprogramming of the ECM can help resolve communication issues and clear the U0155 code in GMC vehicles.

8. Are there any recalls or technical service bulletins related to the OBDII code U0155 in GMC vehicles?

- It's advisable to check with the manufacturer or a GMC dealership to inquire about any recalls or technical service bulletins related to the U0155 code in your specific vehicle model.

9. How long does it typically take to repair the OBDII code U0155 issue in a GMC vehicle?

- The repair time for the U0155 code can vary depending on the exact cause of the communication failure, but it may take a few hours to a full day for diagnosis and repairs.

10. Will resetting the OBDII code U0155 clear the issue permanently in a GMC vehicle?

- Resetting the code may clear it temporarily, but if the underlying communication problem persists, the U0155 code is likely to reappear until the root cause is properly addressed.