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Engine-Codes – Generic – U0136

U0136 Code - Lost Communication With Differential Control Module Rear

Quick Answer

The OBD-II code U0136 indicates that the vehicle has lost communication with the Differential Control Module Rear (DCM-R). Common causes include Faulty wiring or connectors in the communication network between the vehicle's onboard computer system and the DCM-R, Malfunctioning DCM-R module, Interference from electromagnetic sources disrupting communication signals. 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
U0136 indicates Lost Communication With Differential Control Module Rear.
Common causes
Common causes include Faulty wiring or connectors in the communication network between the vehicle's onboard computer system and the DCM-R, Malfunctioning DCM-R module, Interference from electromagnetic sources disrupting communication signals.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code U0136 Description

The OBD-II code U0136 indicates that the vehicle has lost communication with the Differential Control Module Rear (DCM-R). The DCM-R is responsible for controlling the differential in the rear axle of the vehicle, which is crucial for maintaining traction and stability, especially in slippery or uneven road conditions. When communication with the DCM-R is lost, it can lead to a variety of issues with the vehicle's performance and safety systems.

OBDII Code U0136 - Lost Communication With Differential Control Module Rear
U0136 Code - Lost Communication With Differential Control Module Rear

Common Causes of U0136

  1. Faulty wiring or connectors in the communication network between the vehicle's onboard computer system and the DCM-R
  2. Malfunctioning DCM-R module
  3. Interference from electromagnetic sources disrupting communication signals
  4. Corrosion or damage to the wiring harness connected to the DCM-R
  5. Software issues in the vehicle's onboard computer system affecting communication with the DCM-R

Symptoms of U0136

  1. Illuminated dashboard warning light for traction control or stability control
  2. Reduced traction or stability while driving, especially on slippery surfaces
  3. Difficulty shifting gears or abnormal shifting patterns
  4. Decreased fuel efficiency
  5. Unusual noises coming from the rear axle area

How to Fix U0136

  1. Begin by conducting a thorough inspection of the wiring harness and connectors between the onboard computer system and the DCM-R. Look for any signs of damage, corrosion, or loose connections.
  2. Check the DCM-R module for any visible damage or signs of malfunction. Test the module using diagnostic tools to determine if it is functioning correctly.
  3. Use a scan tool to reset the communication codes and attempt to establish communication with the DCM-R. Monitor the system for any reoccurrence of the U0136 code.
  4. If the issue persists, consider reprogramming the vehicle's onboard computer system to ensure proper communication with the DCM-R. Consult the manufacturer's technical service bulletins for any software updates related to this issue.
  5. If all else fails, replace the DCM-R module with a new unit and reprogram it to establish proper communication with the vehicle's systems.

Cost to Fix U0136

The typical repair costs for addressing the U0136 code can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. On average, the cost of diagnosing and repairing a communication error with the DCM-R can range from $200 to $500, including parts and labor. Keep in mind that prices may vary based on the vehicle make and model, the location of the repair shop, and the extent of the repairs needed. It is advisable to obtain quotes from multiple repair shops and compare prices before proceeding with the repair.

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Code U0136 Information for Specific Makes

  • U0136 Buick — Lost Communication With Rear Differential Control Module
  • U0136 Cadillac — Lost Communication With Rear Differential Control Module
  • U0136 Chevrolet — Lost Communication With Rear Differential Control Module
  • U0136 GMC — Lost Communication With Rear Differential 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.

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