U0552 code meaning
Invalid Data Received From Running Board Control Module B
What U0552 means
A second running board controller only makes sense where each side of the vehicle has its own electronics. A 2004 Ford patent for powered boards has one central module drive the left and right boards separately, so a design with one node per side is plausible, but no manufacturer publishes which side B would be. Ford, the best documented user of power running boards, fits a single RBM in the F-150, Super Duty and Expedition/Navigator; it drops from Auto to Off after a battery undervoltage event with U3003:16 (SSM 50154). U0552 means messages from module B arrive but fail plausibility; U0251 would mean they are missing. No manufacturer documents U0552 publicly. Typically one board stops deploying or the feature switches itself off.
U0552 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0552
- Running board on one side no longer deploys or retracts
- Running board setting changes from Auto to Off without driver input
Common causes of U0552
- PossibleBattery undervoltage or discharged battery disturbing the running board electronics
- PossibleRunning board module software fault (Ford fixes comparable faults by reprogramming)
- PossibleCorroded connector or chafed wiring at the board motor under the body
- Less likelyRunning board control module B internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Running board module b
What each part of U0552 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 52 | The exact fault in that area. |
What to do next
- Note U0552 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 U0552
What does U0552 mean?
U0552 means "Invalid Data Received From Running Board Control Module B". A second running board controller only makes sense where each side of the vehicle has its own electronics. It is a generic code, so it means the same on every make.
Is it safe to drive with U0552?
U0552 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0552 fail an emissions test?
U0552 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 U0552 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U0552 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.