Source-backed diagnostic reference

U0136 Code: Meaning & Diagnostic Guide

Lost Communication With Differential Control Module - Rear

Reference status: This page preserves source-backed code definitions for discovery. Manufacturer/model applicability, repair steps and safety conclusions are not treated as verified unless a manufacturer-specific verified report is available.

What does U0136 mean?

GENERIC: Lost Communication With Differential Control Module - Rear Source
GENERIC: Lost Communication with Park Brake Module B Source

U0136 quick answer

U0136 is a communication fault code, but its generic description varies by reference: it may mean lost communication with the rear differential control module or with Park Brake Module B. Check the vehicle-specific service information to determine which module the code refers to.

Is U0136 generic or manufacturer-specific?

U0136 has a generic source-backed definition in this database. The exact vehicle make, model, year and powertrain should be confirmed before using a definition for diagnosis.

How U0136 works in the vehicle

U0136 belongs to the network communication code family. “Lost communication” means a control module is not receiving expected messages from another module. The supplied generic references disagree about the module involved, so the code alone does not identify a confirmed failed component.

U0136 symptoms

Depending on the vehicle and the affected system, there may be a warning light or message, or a feature related to the identified module may not work as expected. The code may also be stored without an obvious symptom.

Possible causes of U0136

Possible explanations include a temporary communication interruption, low or unstable system voltage, a wiring or connector issue, or a problem involving one of the communicating modules. These are possibilities, not confirmed causes for this code.

How to diagnose U0136

Confirm the vehicle’s year, make, model, and equipment, then check manufacturer service information to identify what U0136 means for that vehicle.
Use a suitable scan tool to read codes from all modules, including their status and any related communication or voltage codes.
Check the vehicle battery and charging system using appropriate service procedures.
Have a qualified technician inspect relevant wiring and connectors for damage, looseness, or corrosion.
Follow vehicle-specific diagnostic procedures before deciding whether any module needs repair or replacement.

How to fix U0136

Address the cause established by vehicle-specific testing. Depending on the findings, this could involve correcting a voltage or connection issue or further diagnosing a module. Do not replace a module based on U0136 alone.

Can I drive with U0136?

Driving guidance depends on which system is affected and whether it is operating normally. If a brake-related warning appears, braking behavior changes, or the vehicle displays an urgent warning, stop when safe and seek qualified assistance. Otherwise, consult the owner’s manual or a technician for vehicle-specific advice.

U0136 frequently asked questions

What does U0136 mean?

It indicates a lost communication condition, but generic references differ on whether the other module is the rear differential control module or Park Brake Module B. Confirm the definition for the specific vehicle.

Does U0136 prove that a module has failed?

No. It reports a communication problem and does not by itself identify a failed module or its cause.

Can U0136 be caused by a wiring or voltage issue?

Those are possible causes, but they must be checked. The supplied evidence does not establish a specific cause.

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