What U0002 means
The high-speed CAN bus is functional but performance is degraded — frame errors, bit errors or excessive bus load have been detected.
How the engine computer detects it
Communication may be intermittent rather than completely lost, leading to sporadic warning lamps.
Written from public technical sources and not yet checked by a mechanic. How we write these pages
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Common causes
- Corrosion or poor contact in CAN connectors Most likely
- Electromagnetic interference (aftermarket electronics) Possible
- One module sending malformed frames Possible
How to diagnose U0002
- Read every stored code with an OBD-II scanner. If misfire or fuel trim codes are there too, fix those first: they often cause this one.
- Inspect the parts involved: can bus wiring, control module.
- Work through the causes above from most to least likely, cheapest checks first.
- Clear the code and drive a full drive cycle to confirm the repair held.
Vehicles that report U0002 most
| Vehicle | Years | Reports | Share | Median miles |
|---|---|---|---|---|
| Dodge Charger | 2009–2013 | 3 | — |
Counts of owner complaints to the NHTSA that mention U0002 (11 in total), not failure rates: popular models get more complaints simply because more of them are on the road. Models with fewer than 3 complaints are left out.
Reading the code
- U
- Network
- 0
- Generic (SAE) code
- 002
- Specific fault
Questions drivers ask
Can I drive with code U0002?
It depends on which module stopped communicating. If the car drives normally, drive carefully to a shop. If the engine, transmission, brakes or steering act up, or many warning lights come on at once, stop and have it towed.
This page is general information, not a substitute for a professional diagnosis. Repair costs are rough estimates for parts and labor and vary by vehicle and region.