C0700Active Steering Module Communication
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- No public record shows a carmaker using C0700; public J2012 lists, NHTSA bulletins and maker indexes are silent. The title concerns superimposed steering such as the system from the Bosch-ZF venture that BMW introduced on the 2004 5 Series. A compound planetary set in the steering shaft adds an angle from an electric motor that turns the carrier, and an electromagnetic lock holds that carrier still whenever the function is off. A separate controller needs the angles at the wheel and at the pinion plus vehicle and wheel speeds over the network to compute the extra angle. If that exchange breaks down, the logical reaction is to lock the gear set, leaving a fixed ratio with full hydraulic assist; the car steers normally but feels slower at parking speeds. Lost communication is more often filed under U codes.
- What you may notice
- Steering warning in the instrument cluster
- Steering ratio stays fixed, more wheel turns when parking
- Likely causes
- LikelyDamaged bus wiring or connector to the active steering controller
- PossibleSteering angle or wheel speed message missing from another module
- RareActive steering controller without power or defective
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.