AutoCodes – Generic – U135C

U135C 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 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 2,813

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

What does this mean?

What are the Possible Causes of the DTC U135C?

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?

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 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.

Need more information about the U135C code?

Need more information on how to fix the U135C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U135C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U135C Buick — Lost Communication With Start-Stop Capacitor Control Module
U135C Cadillac — Lost Communication With Start-Stop Capacitor Control Module
U135C Chevrolet — Lost Communication With Start-Stop Capacitor Control Module
U135C GMC — Lost Communication With Start-Stop Capacitor Control Module

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 Code

1. What are the common symptoms of OBDII code U135C?

- Common symptoms include the start-stop system not functioning properly, the engine stalling unexpectedly, and the vehicle not starting at all.

2. What can cause the OBDII code U135C to appear?

- The code U135C is typically triggered by a communication breakdown between the vehicle's control modules and the start-stop capacitor control module.

3. How is the Lost Communication With Start-Stop Capacitor Control Module issue diagnosed?

- Diagnosis involves using a diagnostic scanner to retrieve the code and then conducting a thorough inspection of the wiring, connectors, and modules related to the start-stop system.

4. What are some possible repair tips for resolving code U135C?

- Repair tips may include checking and repairing any damaged wiring or connectors, resetting the control modules, and ensuring all software updates are current.

5. Can I continue driving my vehicle with the U135C code present?

- It is not recommended to continue driving the vehicle with the U135C code present, as it can lead to further issues with the start-stop system and potentially affect the vehicle's overall performance.

6. Is it safe to attempt to clear the U135C code using a diagnostic scanner?

- While you can try clearing the code with a diagnostic scanner, it is important to address the root cause of the communication issue to prevent the code from reappearing.

7. Are there any recalls or service bulletins related to OBDII code U135C?

- It is recommended to check with your vehicle manufacturer or authorized dealer to see if there are any recalls or service bulletins related to the U135C code for your specific vehicle make and model.

8. How much does it typically cost to repair the Lost Communication With Start-Stop Capacitor Control Module issue?

- The cost of repair can vary depending on the extent of the issue and the specific repairs needed. It is advisable to consult with a professional mechanic for an accurate estimate.

9. Can a DIY enthusiast with basic automotive knowledge fix the U135C code issue?

- While some basic troubleshooting steps can be taken, diagnosing and repairing the U135C code may require specialized tools and expertise, so it is recommended to seek professional help.

10. How long does it take to resolve the U135C code issue?

- The time needed to resolve the U135C code can vary based on the complexity of the issue and the availability of parts. It is best to consult with a mechanic for a more accurate timeline.