U0499 code meaning
Invalid Data Received From Telematic Control Module
What U0499 means
U0499 means the telematic control module, which carries the cellular modem for remote services and, in the EU, the 112 eCall required by Regulation 2015/758, sends data a receiver rejects. GM's 2025 tables (25OBDG04B) let the object calculation module EOCM3 check ARC, checksum or MAC on the telematics unit's precise positioning frames (heading, latitude, longitude): 6 of 10 faulty, judged over 8 s of a 10 s window, 9-16 V, partial network on, over 5 s after reset; Type D, no MIL, Super Cruise and adaptive cruise switch off. Stellantis (08-216-26, 2026 Charger; S268A000004, 2026 Cherokee) finds U0499-00 in the BCM, to be solved by TBM software, not by new parts. U0198 is lost contact.
U0499 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0499
- Super Cruise or adaptive cruise unavailable on GM vehicles
- Connected services or an infotainment service message
- Often no noticeable effect, code cannot be cleared
Common causes of U0499
- Most likelyTelematics module software sending faulty or unprotected frames, fixed by an update
- PossibleCorrupted positioning data from the telematics unit (GPS antenna or receiver issues)
- Less likelyInternal fault of the telematics module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Telematic module
What each part of U0499 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 99 | The exact fault in that area. |
What to do next
- Note U0499 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 U0499
What does U0499 mean?
U0499 means "Invalid Data Received From Telematic Control Module". U0499 means the telematic control module, which carries the cellular modem for remote services and, in the EU, the 112 eCall required by Regulation 2015/758, sends data a receiver rejects. It is a generic code, so it means the same on every make.
Is it safe to drive with U0499?
U0499 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0499 fail an emissions test?
U0499 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 U0499 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will U0499 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.