U0555 code meaning
Invalid Data Received From Remote Start Module
What U0555 means
A remote start module lets the engine run from a key fob or app for heating or cooling and must work around the immobilizer while doing so; it may be a factory part, a dealer accessory or an aftermarket box tied into the CAN network. GM lists the remote start module as its own node (Saab 9-5 2011: U0254). Subaru shows how a mismatch in the interface between gateway and its accessory Remote Engine Starter set U0254 on the 2020 Legacy/Outback without any effect on function, cured by revised modules (15-258-19R). Mercedes warns that aftermarket remote start and other CAN devices on Sprinter and Metris can cause communication faults and failed programming. U0555 means frames come in but are invalid; U0254 means none arrive. No bulletin names U0555. Remote start may fail or nothing is noticeable.
U0555 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0555
- Engine does not start or shuts down again when started remotely
- Code found during an all-systems scan with no noticeable fault
- Module programming at the workshop does not complete
Common causes of U0555
- Most likelyAftermarket remote starter or other add-on device on the CAN bus sending non-conforming messages
- PossibleSoftware of the remote start module not matching the vehicle gateway
- PossiblePoor splices or connectors from the remote starter installation
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Remote start module
What each part of U0555 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 55 | The exact fault in that area. |
What to do next
- Note U0555 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 U0555
What does U0555 mean?
U0555 means "Invalid Data Received From Remote Start Module". A remote start module lets the engine run from a key fob or app for heating or cooling and must work around the immobilizer while doing so; it may be a factory part, a dealer accessory or an aftermarket box tied into the CAN network. It is a generic code, so it means the same on every make.
Is it safe to drive with U0555?
U0555 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0555 fail an emissions test?
U0555 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 U0555 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. This is a job for a workshop.
Will U0555 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.