Is it safe to drive with this code?

In many cases you can continue to drive, as the code commonly affects only the remote start convenience feature; however, if accompanied by other codes or warning lights, further investigation is advisable—see our disclaimer for professional guidance.

It may do—what matters is whether the malfunction indicator lamp (MIL) is illuminated at the time of the test; consult our MOT disclaimer and have the fault checked before your test date.

Roughly how much does it cost to fix?

Diagnosis typically takes around one hour at workshop rates; if the fault is a blown fuse or loose connection, costs may be in the low two-figure range, whereas a replacement module and programming can reach mid to high three-figure sums—dealer rates will be higher than independent specialists.

Can this code appear even if the remote start still works?

Yes—on some vehicles (notably certain Subaru models) the code may be stored due to a software interface quirk and can often be ignored if the remote start function operates normally; however, persistent codes with actual loss of function require proper diagnostics.

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← All fault codes | ECU

U0254

Network

Lost Communication With Remote Start Module

The vehicle's control modules have lost communication with the remote start module, typically due to a fault in the data network or power supply.

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ⓘ Information only. This page provides general educational information about fault code U0254. 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 U0254 mean?

U0254 is a Network (CAN bus, module communications) fault code. It indicates: Lost Communication With Remote Start Module.

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.

U0254 is one of 1,108 codes in this category. Browse all ECU codes →

What we know about U0254 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 U0254.

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 U0254 in the U-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.

U0251 Lost Communication With Running Board Control Module B

U0252 Lost Communication With Lighting Control Module Rear B

U0253 Lost Communication With Accessory Protocol Interface Module

U0255 Lost Communication With Front Display Interface Module

U0256 Lost Communication With Front Controls Interface Module "A"

U0257 Lost Communication With Front Controls/Display Interface Module

Other ECU codes

Other fault codes in the same system as U0254. 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 U0254 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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