U0248 code meaning
Lost Communication With Remote Accessory Module
What U0248 means
No manufacturer explains publicly what the remote accessory module does or when U0248 is set. The name suggests a body-side unit that switches accessories outside the main controllers. Separate codes exist for Ford's SYNC interface unit (APIM, U0253) and for a remote start module (U0254). For the 2011 Saab 9-5, GM explains how lost-communication codes arise in general: receivers check for expected signals, some serving as a sender's heartbeat; when one stops, they fall back to default values and record a lost-contact code for that sender. The same GM code list has no entry for U0248. Any listener would follow that scheme once this module falls silent. What the driver notices depends entirely on the accessory involved; driving is unaffected. Invalid data from it are U0549.
U0248 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 U0248
- Accessory function controlled by the module inoperative
- Code stored in other modules without noticeable fault
Common causes of U0248
- Most likelyModule without power or ground (fuse, connector)
- PossibleRetrofitted or removed accessory, module configured but not present
- PossibleBus wiring or connector to the module damaged
- Less likelyModule internally faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Remote accessory moduleCAN bus
What each part of U0248 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 48 | The exact fault in that area. |
What to do next
- Note U0248 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 U0248
What does U0248 mean?
U0248 means "Lost Communication With Remote Accessory Module". No manufacturer explains publicly what the remote accessory module does or when U0248 is set. It is a generic code, so it means the same on every make.
Is it safe to drive with U0248?
U0248 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0248 fail an emissions test?
U0248 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 U0248 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will U0248 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.