P0898Transmission Control System MIL Request Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The MIL request circuit is a dedicated wire over which the gearbox module asks the engine module to switch on the MIL. Today that request travels over CAN and shows as P0700 in the engine module; older Subarus, also sold as Saab 9-2X, used a single serial wire with its own codes P0864 to P0866. P0898 means the request wire stays at ground: a short to ground or, with active-high logic, a gearbox module without power. The engine module can then not tell a real request from a wiring fault. No maker documents the code; Subaru's P0865 is the closest documented equivalent.
- What you may notice
- MIL on
- Gearbox faults may not be indicated correctly
- Likely causes
- LikelyMIL request wire shorted to ground
- PossibleEngine or gearbox module connector corroded
- RareGearbox module output faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.