P220C NOx Sensor Supply Voltage Circuit (Bank 2 Sensor 1)

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.

Likely causes

Symptoms

• Malfunction indicator lamp on
• No NOx value from the bank 2 upstream sensor

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, fordservicecontent.com, ni.com.