C0920Suspension Control Module Internal Fault
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0920 is not found in any accessible list or bulletin. The title describes a suspension control unit that fails its own checks. GM names such a fault C0550 Electronic Control Unit, as the 2011 Saab 9-5 pages show: the self-test runs at power-up and needs only supply and ground, the module ignores further inputs, and it should only be replaced if the code is present as current and history entry; a history entry clears after 50 clean ignition cycles. Not every module swap is an internal fault: GM's PI0954 had 2010 LaCrosse suspension modules replaced because they did not accept service accelerometers, and Stellantis warns against replacing the damping module for stored codes. Audi logs C129700 for a limiting fault inside its roll stabiliser units.
- What you may notice
- Suspension service message, adaptive damping or levelling off
- Other suspension codes may be stored alongside
- Likely causes
- LikelyInternal hardware or memory fault confirmed as current and history code
- PossiblePoor supply or ground at the module triggering self-test failures
- RareSoftware or parts incompatibility (GM PI0954, Audi 2067804/3)
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.