AutoCodes – Cadillac – U135C Cadillac

U135C Cadillac 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 Cadillac 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 4,673

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

What does this mean?

What are the Possible Causes of the DTC U135C Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What are common symptoms of the U135C OBDII code in a Cadillac related to the Start-Stop Capacitor Control Module?

- Common symptoms include issues with the start-stop system functionality, abnormal engine starting behavior, and potential dashboard warning lights.

2. What can cause the U135C OBDII code indicating a lost communication with the Start-Stop Capacitor Control Module in a Cadillac?

- Possible causes include damaged wiring or connectors, a faulty control module, software issues, or a weak vehicle battery.

3. How can I diagnose the U135C code in my Cadillac related to the Start-Stop Capacitor Control Module?

- Diagnosis typically involves using a diagnostic scanner to retrieve the code, checking for related codes, inspecting wiring and connections, and testing the control module.

4. Is it safe to continue driving my Cadillac if the U135C code related to the Start-Stop Capacitor Control Module appears?

- It is generally not recommended to drive the vehicle when this code is present, as it may affect the proper functioning of the start-stop system and potentially other systems.

5. What are some possible DIY repair tips for addressing the U135C code in a Cadillac?

- DIY repair tips may include checking and cleaning the wiring harness connections, ensuring the vehicle battery is in good condition, and resetting the system using a diagnostic tool.

6. Can a weak vehicle battery cause the U135C code indicating lost communication with the Start-Stop Capacitor Control Module in a Cadillac?

- Yes, a weak or failing vehicle battery can potentially trigger this code due to insufficient power supply to the control module.

7. How much does it typically cost to repair the U135C code related to the Start-Stop Capacitor Control Module in a Cadillac?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a simple wiring repair cost to the replacement of the control module.

8. Are there any recalls or technical service bulletins related to the U135C code in Cadillacs?

- It is recommended to check with Cadillac dealerships or online resources for any relevant recalls or technical service bulletins related to this specific OBDII code.

9. Can driving in extreme weather conditions lead to the U135C code appearing in a Cadillac?

- Extreme weather conditions can potentially affect the electrical components of the start-stop system, leading to issues that may trigger the U135C code.

10. How can I prevent the U135C OBDII code related to the Start-Stop Capacitor Control Module from occurring in my Cadillac?

- Regular maintenance checks, ensuring a healthy vehicle battery, and addressing any start-stop system issues promptly can help prevent the occurrence of this OBDII code.