C0205Stop Lamp Switch Circuit
- Generic OBD-II code · Chassis
- How the car detects it
- C0205 cannot be found in the accessible J2012 lists, in NHTSA bulletins or in maker indexes; its title is identical to that of C0136, and GM-designed brake modules such as that of the Saab 9-4X use C0161 for the brake switch input. The switch itself is a closing contact that passes battery voltage to the brake module and the stop lamps when the pedal is pressed, as Saab's 9-3 ESP data show. Saab's 9-5 ESP module supervises the line by feeding a small current into it that returns to ground through the stop lamp bulbs; an interruption there is stored as C2470. Bosch and Nissan Diesel patented a scheme with two pedal switches that must agree, counting repeated mismatches before declaring both failed. Dark or permanently lit stop lamps are the first hint.
- What you may notice
- Stop lamps stay off or stay on
- Cruise control will not engage or does not switch off when braking
- ABS/ESC warning lamp on
- Likely causes
- LikelyStop lamp switch misadjusted, worn or broken
- PossibleBlown stop lamp bulbs or fuse interrupting the monitoring path
- PossibleBroken wire or corroded connector at the pedal
- Repair
- Easy · Often possible to do yourself.Typical cost: €15 – €120
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.