U0254 code meaning
Lost Communication With Remote Start Module
What U0254 means
A remote start module runs the engine from a key fob or app so the cabin can be heated or cooled before departure. GM's list for the 2011 Saab 9-5 treats it as a network node of its own under U0254. Subaru documents the code for 2020 Legacy and Outback models with the genuine accessory Remote Engine Starter: the central gateway stored U0254 during an all-systems check because of a software interface mismatch between gateway and starter, although the accessory worked normally. The bulletin allows ignoring the code on its own, and later replacement starter units carry revised U0254 logic (15-258-19, revised as 15-258-19R). With a real fault the starter is unpowered, unplugged or defective, so remote start fails while normal driving is unaffected. Corrupt frames from it are U0555.
U0254 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.2 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0254
- Remote start does not work or stops after a short time
- Code found only during a full system scan, no other complaint
Common causes of U0254
- Most likelySoftware interface mismatch between gateway and accessory starter (Subaru), no real fault
- PossiblePoor installation, loose connector or missing supply of an accessory or aftermarket starter
- PossibleStarter removed or disconnected while the vehicle configuration still expects it
- Less likelyInternal failure of the remote start module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Remote start moduleVehicle bus wiring
What each part of U0254 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 54 | The exact fault in that area. |
What to do next
- Note U0254 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 U0254
What does U0254 mean?
U0254 means "Lost Communication With Remote Start Module". A remote start module runs the engine from a key fob or app so the cabin can be heated or cooled before departure. It is a generic code, so it means the same on every make.
Is it safe to drive with U0254?
U0254 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0254 fail an emissions test?
U0254 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 U0254 to fix?
Difficulty: medium. A typical repair takes 0.2 to 2 hours of work. This is a job for a workshop.
Will U0254 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.