Corroded, loose, or damaged electrical connector at the localization and mapping module; Failed localization and mapping module internal fault causing corrupted data output; Software error or outdated calibration in the module or a receiving module; CAN bus communication fault, such as a shorted or open data line, affecting message integrity; Low voltage or poor ground at the module, leading to intermittent data corruption; Aftermarket electronic device or improper installation interfering with the vehicle's communication network

DTC codes / U05xx · Network communication / U05BD

U05BDInvalid Data Received From Localization and Mapping Module

Q: What does code U05BD mean?

Invalid Data Received From Localization and Mapping Module. U05BD means the vehicle's localization and mapping module, which provides position and environment data for driver-assist and navigation functions, is sending data that other modules consider invalid or corrupted. The computer that set the code detected a message from this module that failed its internal plausibility or checksum validation, so it cannot trust the position or map information being broadcast.

U05BD means the vehicle's localization and mapping module, which provides position and environment data for driver-assist and navigation functions, is sending data that other modules consider invalid or corrupted. The computer that set the code detected a message from this module that failed its internal plausibility or checksum validation, so it cannot trust the position or map information being broadcast.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaNetwork communication

Symptoms you may notice

Illumination of the check engine light or a dedicated driver-assist warning light
Often no symptoms besides the warning light, with all systems appearing to operate normally
Adaptive cruise control or lane-keeping assist may become unavailable or behave erratically
Navigation display may show the vehicle position incorrectly or freeze
A message on the dash indicating that forward collision warning or automatic emergency braking is disabled
Intermittent operation of parking aids or semi-autonomous features during the same drive cycle

Common causes, most likely first

Corroded, loose, or damaged electrical connector at the localization and mapping module
Failed localization and mapping module internal fault causing corrupted data output
Software error or outdated calibration in the module or a receiving module
CAN bus communication fault, such as a shorted or open data line, affecting message integrity
Low voltage or poor ground at the module, leading to intermittent data corruption
Aftermarket electronic device or improper installation interfering with the vehicle's communication network

How to diagnose and fix it

Perform a full scan of all modules and record all stored and pending codes to establish the fault context
Inspect the localization and mapping module connector and wiring for corrosion, looseness, or damage, and repair as needed
Check battery voltage and ground connections at the module to rule out power supply issues
Verify the module's software version and calibration against the latest available from the manufacturer, and update if required
Use a scan tool to monitor live data from the localization and mapping module for implausible or missing values while wiggling harnesses
If data remains invalid after electrical and software checks, replace the localization and mapping module and perform any required initialization or calibration
Clear codes and perform a road test to confirm the fault does not return

When the mapping module is not the culprit

A weak or failing battery often causes this code because the localization and mapping module is sensitive to voltage drops during cranking, leading to corrupted data that sets U05BD without any module defect.
The code can be set by a faulty receiving module that misinterprets valid data, so replacing the localization and mapping module without checking communication on the bus can be an expensive misdiagnosis.
Aftermarket dash cams, radar detectors, or phone chargers plugged into the wrong circuit can introduce electrical noise that corrupts CAN bus messages and triggers U05BD intermittently.
A software update to the body control module or gateway may be required to correct message handling, and this is often overlooked when only the localization module is inspected.
U05BD can appear after windshield replacement if the forward-facing camera or sensor is disturbed, because the localization and mapping module relies on that data for map matching.

Can I keep driving with U05BD?

The vehicle remains safe to drive in most cases because the fault primarily affects driver-assist and navigation features, but you should avoid relying on adaptive cruise control, lane keeping, or automatic emergency braking until the code is repaired. If the warning light is accompanied by a loss of power steering or braking assist, stop driving and seek professional service immediately.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.