U020A code meaning
Lost Communication With Moveable Roof Control Module B
What U020A means
U020A stands for moveable roof control module B, a second roof unit beside module A (U0207); which drive it controls, for instance a separate sunshade or a further glass panel, depends on the maker. No manufacturer documents this code publicly. Related service experience comes from roof modules in general: Kia service action SA595 (bulletin 363, 2025 K4) updates the roof control module because a software logic error left the sunroof unable to open or close, and the update contains a reset of the module for sunroof initialisation. Power roofs usually need such a re-learn after a power loss or module replacement before they travel fully again. Invalid data from unit B is U050B. No MIL.
U020A at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U020A
- Second roof panel or sunshade does not move
- Roof stops halfway or needs repeated button presses
Common causes of U020A
- PossibleRoof module software or missing initialisation
- PossibleWet or corroded connector in the headliner
- PossibleFuse or ground of roof module B
- Less likelyRoof module B faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Moveable roof module bCAN bus
What each part of U020A means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0A | The exact fault in that area. |
What to do next
- Note U020A and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U020A
What does U020A mean?
U020A means "Lost Communication With Moveable Roof Control Module B". U020A stands for moveable roof control module B, a second roof unit beside module A (U0207); which drive it controls, for instance a separate sunshade or a further glass panel, depends on the maker. It is a generic code, so it means the same on every make.
Is it safe to drive with U020A?
U020A does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U020A fail an emissions test?
U020A is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U020A to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will U020A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.