AutoCodes – GMC – U135C GMC

U135C GMC Code - Lost Communication With Start-Stop Capacitor Control Module

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 Start-Stop Capacitor Control Module, Start-Stop Capacitor Control Module harness is open or shorted, Start-Stop Capacitor 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: U135C GMC indicates Lost Communication With Start-Stop Capacitor Control Module.
Common causes: Common causes include Faulty Start-Stop Capacitor Control Module, Start-Stop Capacitor Control Module harness is open or shorted, Start-Stop Capacitor 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 876

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 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U135C 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) sets when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U135C GMC - Lost Communication With Start-Stop Capacitor Control Module - AutoCodes.com — U135C GMC Code - Lost Communication With Start-Stop Capacitor Control Module

What does this mean?

What are the Possible Causes of the DTC U135C GMC?

Faulty Start-Stop Capacitor Control Module
Start-Stop Capacitor Control Module harness is open or shorted
Start-Stop Capacitor Control Module circuit poor electrical connection

How to Fix the DTC U135C 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 U135C 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 U135C GMC Code

1. What does the OBDII code U135C mean on a GMC vehicle?

The U135C code indicates a loss of communication with the Start-Stop Capacitor Control Module, which is part of the vehicle's start-stop system.

2. What are the symptoms of the U135C code?

Common symptoms include a malfunctioning start-stop system, the check engine light or service warning light illuminating, and possible reduced fuel efficiency.

3. What causes the U135C code to appear?

The code can be caused by faulty wiring or connections, a failed Start-Stop Capacitor Control Module, software issues, or problems with the communication network, such as the CAN bus.

4. Can a loose connection cause the U135C code?

Yes, a loose or corroded connection between the Start-Stop Capacitor Control Module and the vehicle's network can trigger this code.

5. How can I diagnose the U135C code?

Diagnose the code by scanning for additional trouble codes, inspecting wiring and connectors for damage or corrosion, and testing the Start-Stop Capacitor Control Module for proper functionality.

6. Is the U135C code related to the battery?

Indirectly, yes. A weak or failing battery can sometimes cause communication issues, including triggering the U135C code.

7. Can I drive with the U135C code?

While the vehicle may still be drivable, the start-stop system may not function correctly, and ignoring the issue could lead to further complications.

8. How do I fix the U135C code on my GMC?

Repairs may involve securing or replacing faulty wiring or connectors, reprogramming or updating software, or replacing the Start-Stop Capacitor Control Module if itâ€™s defective.

9. Is the U135C code covered under warranty?

It depends on your specific GMC warranty. Components like the Start-Stop Capacitor Control Module may be covered under powertrain or emissions warranties.

10. Can a software update resolve the U135C code?

Yes, in some cases, a software update from the manufacturer may resolve communication issues causing the U135C code.