U0198Lost Communication With Telematic Control Module
- Generic OBD-II code · Network
- How the car detects it
- U0198 marks the telematic control module as silent; that unit holds the cellular modem for remote apps, emergency and assistance calls. Ford's APIM stores it on 2012-2018 Focus Electric, Fusion Energi and C-MAX Energi when the TCU hangs: SSM 46534 and 47198 report a drained battery, dead MyFord Mobile features and no modem ESN, cured by pulling the TCU fuse for five minutes and reprogramming. For the 2023 Super Duty, SSM 51578 treats U0198:87 in the BCM after a self-test as a false history entry to ignore if the MIL is off. Mazda SA-029/20 (Mazda3, CX-30) ties U0198:00 in the BCM to the emergency call unit; GM PIT5422 (Equinox, Terrain) traces it to water in connector X901. U0197 is the phone module, U0499 invalid data.
- What you may notice
- Remote app, emergency or assistance call unavailable
- Battery drained overnight (Ford plug-in models)
- Network warning in the cluster, often with further U-codes
- Likely causes
- LikelyTelematics unit hung or outdated software (Ford TCU reprogramming)
- PossibleWater or corrosion in a body harness connector (GM X901)
- PossibleLow-speed bus wire pinched or chafed in the roof or body
- RareFalse history entry from a module self-test (Ford Super Duty)
- RareTelematic control module faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.