OBD-II code · Network
U02BB Lost Communication With EVAP System Purge Pump
The vehicle bus reports loss of communication with the EVAP purge pump (used on systems with electric purging instead of intake-vacuum). Vapour purge from the carbon canister cannot be commanded.
Is it safe to drive with U02BB?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBus wiring open or shorted
- PossibleModule without power or ground
- PossibleModule failed
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Evap Purge Pump, Vehicle Bus Wiring
Related codes
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- U02B9Lost Communication With Rear Radar Module D
- U02BALost Communication With Hybrid/EV Electronics Coolant Pump B
- U02BCLost Communication With Localization and Mapping Module
- U02BDLost Communication With Night Vision Control Module
- U02BELost Communication With Trailer Backup Assist Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.