U02BC
Lost Communication With Localization and Mapping Module
The vehicle bus reports loss of communication with the localization and mapping module (HD map / SLAM ECU for ADAS and autonomous functions). Lane-level localization and map-based predictions are unavailable.
The vehicle bus reports loss of communication with the localization and mapping module (HD map / SLAM ECU for ADAS and autonomous functions). Lane-level localization and map-based predictions are unavailable.
Common causes
- high
Bus wiring open or shorted
One of the most commonly reported causes for this code — check this first.
Typical part cost: $440-2750
- medium
Module without power or ground
A plausible cause — test and verify before replacing parts.
Typical part cost: $440-2750
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for U02BC.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for U02BC.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for U02BC.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does U02BC mean?
U02BC means "Lost Communication With Localization and Mapping Module". It is a generic OBD-II code that points to a fault in the network / communication.
What are the most common causes of U02BC?
bus wiring open or shorted; module without power or ground; module failed — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full U02BC diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.