Is it safe to drive with this code?

Yes, in most cases it is safe to drive. This code typically affects only navigation and location-based services, not the engine, brakes, or other safety-critical systems. However, emergency calling features that rely on GPS may be unavailable—see our general disclaimer for further guidance.

This code alone is unlikely to cause an MOT failure, as satellite navigation is not currently tested. What matters is whether the malfunction indicator lamp (check engine light) is illuminated during the test—see our MOT disclaimer for full details.

Roughly how much does it cost to fix?

Costs vary widely depending on the root cause. A simple wiring repair or connector reseat may be in the low two-figure range (under £100). GPS antenna replacement commonly runs in the low to mid three-figure range (£100–400), including parts and labour. If the navigation module itself requires replacement or dealer reprogramming, expect mid to high three-figure costs (£300–800+). Dealer rates are typically higher than independent specialists; always obtain multiple quotes.

Can I fix this myself?

Inspecting the antenna and accessible connectors is often feasible for a competent DIYer. However, diagnosing module-level faults, performing software reflashes, or safely accessing roof-mounted antennas may require specialist tools and knowledge. If you're uncertain, a professional diagnosis is advisable to avoid unnecessary parts replacement.

Professional mechanic working in workshop

← All fault codes | ECU

U046B

Network

Invalid Data Received From Global Positioning System Module

The vehicle's controller has detected that data received from the GPS (satellite navigation) module appears corrupted or implausible, potentially affecting navigation and location-based features.

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ⓘ Information only. This page provides general educational information about fault code U046B. 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 U046B mean?

U046B is a Network (CAN bus, module communications) fault code. It indicates: Invalid Data Received From Global Positioning System 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.

U046B is one of 1,108 codes in this category. Browse all ECU codes →

What we know about U046B 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 U046B.

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 U046B in the U-code series. Many fault codes appear together with their neighbours because they relate to the same circuit or component.

U0468 Invalid Data Received From Fuel Cell Control Module

U0469 Invalid Data Received From Starter / Generator Control Module

U046A Invalid Data Received From Sunroof Control Module

U0471 Invalid Data Received From "Restraints System Sensor A"

U0472 Invalid Data Received From "Restraints System Sensor B"

U0473 Invalid Data Received From "Restraints System Sensor C"

Other ECU codes

Other fault codes in the same system as U046B. 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 U046B 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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