C0912TPMS Initiator Front Circuit Malfunction
- Generic OBD-II code · Chassis
- Needs a drive cycle to confirm a fix
- How the car detects it
- C0912 could not be found in any code list, bulletin or service index, so its use remains unproven. The title refers to the front initiator: a coil near the wheel that wakes the tire sensor with a low frequency field so the system can tell which corner answered. A TRW patent mounts one such induction coil per wheel well and sends at about 125 kHz, relying on the field fading quickly with distance so only the adjacent sensor reacts. A Ford patent wires each initiator straight to the controller and raises the drive current step by step until the sensor replies. Honda reports a shorted initiator line as code 45. An open or shorted front circuit leaves the front sensors unlocated, so pressure values may lack their position.
- What you may notice
- TPMS malfunction lamp on
- Front tire pressures shown without wheel position or not at all after a tire change
- Likely causes
- LikelyInitiator wiring in the wheel arch chafed, corroded or unplugged
- PossibleInitiator coil open or shorted internally
- PossibleInitiator knocked out of its mount by wheel arch liner damage
- RareOutput stage in the TPMS module defective
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.