Is it safe to drive with this code?

In many cases, yes—this code often relates to non-essential convenience or specialist equipment (such as emergency lights on fleet vehicles) rather than core powertrain or safety systems. However, if other symptoms develop or additional codes appear, further assessment is advisable; refer to our disclaimer for professional guidance.

This code may affect your MOT outcome if the malfunction indicator lamp is illuminated at the time of test. The examiner's decision will depend on whether the warning light is lit during the inspection—see our site disclaimer for full context on MOT-related queries.

Roughly how much does it cost to fix?

Costs can vary widely depending on the root cause. A straightforward fuse or ground connection repair might fall into the low two-figure range for parts, while diagnosing and repairing damaged wiring typically sits in the low three-figure bracket once labour is included. If the module itself has failed and requires replacement and programming, costs can reach the mid to high three-figure range at an independent workshop, or higher at a main dealer. The variation reflects the complexity of CAN bus diagnostics and whether specialist fleet-vehicle equipment is involved.

What is the Special Purpose Vehicle Control Module D?

This module is commonly found in fleet, emergency, or specialist vehicles and manages auxiliary equipment such as light bars, sirens, or other aftermarket systems. The 'D' designation simply refers to one of several such modules on the vehicle's network. In standard passenger cars without special equipment, this code is less common.

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← All fault codes | ECU

U025C

Network

Lost Communication With Special Purpose Vehicle Control Module D

The vehicle's on-board computer has detected that the Special Purpose Vehicle Control Module D is no longer communicating over the internal network, typically due to a wiring fault, power loss, or failed module.

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ⓘ Information only. This page provides general educational information about fault code U025C. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.

Recommended next steps

Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.

What does U025C mean?

U025C is a Network (CAN bus, module communications) fault code. It indicates: Lost Communication With Special Purpose Vehicle Control Module D.

This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.

About ECU codes

Engine control unit (ECU) codes relate to the main engine computer itself, its memory, internal processors, supply voltage, or its ability to communicate with sensors and actuators. These are often electrical or wiring-related rather than mechanical faults.

U025C is one of 1,108 codes in this category. Browse all ECU codes →

What we know about U025C specifically

We record the SAE J2012 standardised definition and the system this code belongs to, but we have not yet published detailed driver-reported symptoms, common causes, or step-by-step diagnostic guidance for U025C.

Rather than invent that information by generating generic content from a template, we leave it out. For specific guidance, the most reliable sources are:

•your vehicle's own service manual or manufacturer-specific technical bulletins
•a qualified mechanic with a manufacturer-level diagnostic tool
•a marque specialist familiar with your make and model

Codes nearby

Codes adjacent to U025C in the U-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.

U0259 Lost Communication With Special Purpose Vehicle Control Module A

U025A Lost Communication With Special Purpose Vehicle Control Module B

U025B Lost Communication With Special Purpose Vehicle Control Module C

U025D Lost Communication With Front Controls Interface Module "B"

U0260 Lost Communication With Seat Control Switch Module A

U0261 Lost Communication With Seat Control Switch Module B

Other ECU codes

Other fault codes in the same system as U025C. The ones with detailed guides have plain-English explanations, symptoms, causes, and diagnostic steps.

B1049

Passenger-Side Pre-Tensioner Seat Belt And Other Air Bag Module Circuits Short Detailed guide

P0606

ECM/PCM Processor Fault Detailed guide

U0001

High Speed CAN Communication Bus Detailed guide

U0100

Lost Communication With ECM/PCM Detailed guide

B1000

A/C Switch Request Input Circuit/Performance

B1001

Multiplex Integrated Control Unit (MICU) Internal Error

Spotted an issue or have something to add? Mechanics, technicians, and drivers who have first-hand experience with U025C can submit a correction or expansion. We review every submission before publishing, mechanic submissions are prioritised.

Information only, not professional advice

The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →

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