U02AB — Lost Communication With Vehicle Thermal Management Control Module

What Does U02AB Mean?

U02AB is a diagnostic trouble code indicating: Lost Communication With Vehicle Thermal Management Control Module. 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 U02AB

⚠️ Check Engine Light (MIL) illuminated
⚠️ No communication with Vehicle Thermal Management Control Module
⚠️ 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 Vehicle Thermal Management Control Module
🔍 Power or ground supply issue to Vehicle Thermal Management Control Module
🔍 Vehicle Thermal Management Control Module internal failure
🔍 Water intrusion damaging module or connectors
🔍 CAN bus termination resistor fault

Frequently Asked Questions

What does U02AB mean?

U02AB indicates: Lost Communication With Vehicle Thermal Management Control Module. The vehicle's computer has detected that the Vehicle Thermal Management Control Module is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U02AB?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U02AB for extended periods may cause additional problems.

How much does it cost to fix U02AB?

Repair costs for U02AB 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 Vehicle Thermal Management Control Module for damage
🔧 Check power and ground supply to Vehicle Thermal Management Control Module
🔧 Replace failed Vehicle Thermal Management Control Module

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.

U02AB: Lost Communication With Vehicle Thermal Management Control Module