U02BB — Lost Communications with EVAP System Purge Pump

What Does U02BB Mean?

U02BB is a diagnostic trouble code indicating: Lost Communications with EVAP System Purge Pump. This code relates to the manufacturer-specific network system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of U02BB

⚠️ Check Engine Light (MIL) illuminated
⚠️ No communication with Lost Communications with EVAP System Purge Pump
⚠️ Multiple warning lights may illuminate simultaneously
⚠️ Related system completely inoperative
⚠️ Multiple warning lights on dashboard

Common Causes

🔍 CAN bus wiring fault (open or shorted) to Lost Communications with EVAP System Purge Pump
🔍 Power or ground supply issue to Lost Communications with EVAP System Purge Pump
🔍 Lost Communications with EVAP System Purge Pump internal failure
🔍 Water intrusion damaging module or connectors
🔍 CAN bus termination resistor fault

Frequently Asked Questions

What does U02BB mean?

U02BB indicates: Lost Communications with EVAP System Purge Pump. The vehicle's computer has detected that the Lost Communications with EVAP System Purge Pump is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U02BB?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U02BB for extended periods may cause additional problems.

How much does it cost to fix U02BB?

Repair costs for U02BB typically range from $80 to $1200, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect CAN bus wiring to Lost Communications with EVAP System Purge Pump for damage
🔧 Check power and ground supply to Lost Communications with EVAP System Purge Pump
🔧 Replace failed Lost Communications with EVAP System Purge Pump

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

U02BB: Lost Communications with EVAP System Purge Pump