U05BD

Code

Generic U — Network/User

Invalid Data Received From Localization and Mapping Module

Brand: Generic

Type: U — Network/User

Views: UK: 24 EN: 27 RU: 27

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Page language: EN

Causes

Corrupted CAN/FlexRay/ethernet messages (bit errors, noise, or missing bytes).
Localization & Mapping Module software calibration mismatch or corrupted firmware.
Incompatible or out-of-date map or localization database/version.
Partial or intermittent loss of power, ground, or supply to the LMM.
Faulty wiring, poor connector contact, or damaged cable shield on the vehicle network.
Faulty receiving ECU (the unit reporting the fault) or its network transceiver.

Symptoms

Warning lamp or message for navigation, ADAS or ‘Localization/Mapping Fault’.
Reduced or disabled driver assistance features that rely on map/localization (e.g., lane keeping, automated parking, ADAS fusion).
Incorrect or missing vehicle position on navigation or map display.
Stored network/communication errors in the vehicle diagnostic tool.
Intermittent or persistent loss of features after ignition cycles or module reflashes.

What to check

Read all stored and pending DTCs with a capable scan tool; capture freeze frame and last data.
Confirm software/calibration versions for LMM and dependent ECUs; check for manufacturer TSBs or required simultaneous updates.
Check battery voltage and module supply/ground at the LMM connector (ignition ON and during reboot).
Visually inspect LMM connectors and wiring for corrosion, bent pins, chafing, or water intrusion.
Scan the vehicle network with an OEM tool or CAN/Ethernet sniffer to confirm message IDs, frequency, payload length and CRC correctness.
Check for bus errors using network diagnostics (error counters, bus-off events).

Signal parameters

Message ID and expected message periodicity (Hz) from LMM to other ECUs.
Payload length and expected field offsets (bytes) for localization data (pose, timestamps).
Sequence number or packet counter to detect dropped or out-of-order frames.
Timestamp or GNSS time fields used for latency/age checks.
Checksum/CRC field validity for each message.
Pose fields: X/Y/Z and heading/yaw ranges and expected units.

Diagnostic algorithm

Read all DTCs and freeze frame data with an OEM-capable scan tool; note related U-codes and any P/C/B codes.
Record software/calibration versions for the LMM and the reporting ECU(s). Check manufacturer bulletins for required module pairing or updates.
Inspect physical connections at the LMM: disconnect/reconnect the connector, check pins for corrosion or damage, and secure any loose clamps.
Measure module supply and ground rails for correct voltage and steady supply (no intermittent drop) while cycling ignition and under load.
Monitor the vehicle network using a CAN/CAN FD/Ethernet sniffer or the OEM network diagnostic tool. Look for malformed frames, incorrect lengths, CRC errors, unexpected message IDs, or missing periodic messages from the LMM.
If corrupted messages are seen, isolate wiring runs and check for shorts to power or chassis, damaged shield, or nearby high-voltage noise sources. Repair wiring as needed.
If network traffic looks normal but receiving ECU still reports invalid data, try swapping the LMM with a known-good unit (if available) or reflash the module with the latest approved firmware and reinitialize database/maps per OEM procedure.
Clear codes and perform road test or required drive cycle while monitoring live messages and functionality. If fault returns, capture a full network trace and submit to manufacturer support.
If replacement or reflash does not resolve the issue, investigate the reporting ECU (receiver) for faults or request manufacturer diagnostic guidance—do not replace multiple modules without evidence.
Document repairs, software versions, trace logs and any parts replaced for warranty or technical support escalation.

Likely causes

Software/firmware mismatch between LMM and receiving ECUs (most common with recent software updates).
Corrupted network messages due to wiring/grounding issues or bus noise.
Bad module power/ground or intermittent supply to the LMM.
Damaged connector or terminal at the LMM harness.