U02BC code meaning
Lost Communication With Localization and Mapping Module
What U02BC means
The localization and mapping module merges satellite positioning, correction data and vehicle motion signals with a detailed map, so that hands-free or automated driving knows its lane and the road ahead; Bosch offers such a GNSS-based unit for driver assistance and automation. U02BC means this module has stopped communicating. Stellantis documents it for the 2024-2026 Jeep Wagoneer and Grand Wagoneer (STAR S2508000095): U02BC-00 appears for the GNMM together with Ethernet time-sync and link-status faults toward the central ADAS module, blind spot alerts and other assistance functions shut off, and modules replaced for it proved healthy. The cause was an Ethernet harness routed too tight, straining its connectors; the fix is correct routing or a new harness, never a repaired cable. No MIL.
U02BC at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor1 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U02BC
- Blind spot alert unavailable, service message in the cluster
- Hands-free or advanced driver assistance disabled
- Several ADAS and Ethernet codes stored at once
Common causes of U02BC
- Most likelyEthernet harness routed too tight, connector strained or not latched
- PossibleBent or damaged Ethernet connector pins
- Less likelyModule supply missing or module internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Localization mapping moduleVehicle bus wiring
What each part of U02BC means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| BC | The exact fault in that area. |
What to do next
- Note U02BC and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U02BC
What does U02BC mean?
U02BC means "Lost Communication With Localization and Mapping Module". The localization and mapping module merges satellite positioning, correction data and vehicle motion signals with a detailed map, so that hands-free or automated driving knows its lane and the road ahead; Bosch offers such a GNSS-based unit for driver assistance and automation. It is a generic code, so it means the same on every make.
Is it safe to drive with U02BC?
U02BC does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U02BC fail an emissions test?
U02BC is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U02BC to fix?
Difficulty: hard. A typical repair takes 1 to 3 hours of work. This is a job for a workshop.
Will U02BC clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.