P2160Vehicle Speed Sensor B Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2160 reports that speed signal B shows little or no activity although the vehicle is plainly moving. Which pickup carries the letter B is the manufacturer's choice. GM assigns P2160 to the transfer case output speed sensor of its four-wheel-drive models (table 18OBDG04): with a gear engaged, moderate pedal and torque, no braking and the transmission output turning, a raw sensor reading under 25 rpm for 4.5 seconds stores the code as Type B, so the MIL follows after two trips. A broken wire, a short to ground or a dead sensor are the usual reasons. P2161 covers dropouts and erratic readings, P2158/P2159 the circuit and plausibility of the same sensor. Four-wheel-drive and speed-dependent functions may be restricted.
- What you may notice
- Check engine lamp after two drives
- Four-wheel-drive warning or 4WD modes unavailable
- Speedometer or cruise control misbehaving on some models
- Likely causes
- LikelyBroken signal wire or short to ground between sensor B and the module
- PossibleSpeed sensor B itself delivers no pulses
- PossibleCorroded or pushed-back pins at the sensor connector
- RareTone wheel loose or missing after transfer case or driveline work
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €40 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.