P220CNOx Sensor Supply Voltage Circuit (Bank 2 Sensor 1)
- 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
- P220C is reserved for an engine with a separate exhaust path per cylinder bank, each with its own NOx sensors, and reports that the upstream sensor on bank 2 is not getting a proper supply voltage. No manufacturer documents this code publicly; the diesel pickups and trucks examined (Ford, GM, VW, Volvo/Mack) merge both banks into one SCR line and only use the bank 1 codes. By analogy with P220A, a fault would mean the supply sits outside a window like Ford's 8.5 to 16.5 V, or the supplying module reports a short. Smart sensors send their supply status over CAN, so the engine computer learns it from the sensor itself. Check fuse, relay, ground and wiring for that bank. P220D is the downstream sensor on bank 2.
- What you may notice
- Malfunction indicator lamp on
- No NOx value from the bank 2 upstream sensor
- Likely causes
- LikelyFuse, relay or ground fault in the bank 2 sensor supply
- PossibleSupply wiring to the bank 2 upstream sensor damaged
- RareSystem voltage out of range (battery or alternator)
- 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: €30 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.