U020A — Lost Communication With Moveable Roof Control Module “B”

What Does U020A Mean?

U020A is a diagnostic trouble code indicating: Lost Communication With Moveable Roof Control Module “B”. 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 U020A

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

Frequently Asked Questions

What does U020A mean?

U020A indicates: Lost Communication With Moveable Roof Control Module “B”. The vehicle's computer has detected that the Moveable Roof Control Module “B” is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code U020A?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with U020A for extended periods may cause additional problems.

How much does it cost to fix U020A?

Repair costs for U020A 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 Moveable Roof Control Module “B” for damage
🔧 Check power and ground supply to Moveable Roof Control Module “B”
🔧 Replace failed Moveable Roof Control Module “B”

1
Find your vehicle above
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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.

U020A: Lost Communication With Moveable Roof Control Module “B”