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Home / DTC / P220C — NOx Sensor Supply Voltage Circuit Bank 2 Sensor 1

P220C — NOx Sensor Supply Voltage Circuit Bank 2 Sensor 1

Detailed page for trouble code P220C.

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Code

P220C

Generic P — Powertrain

NOx Sensor Supply Voltage Circuit Bank 2 Sensor 1

Brand: Generic
Type: P — Powertrain
Views: UK: 16 EN: 27 RU: 16
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Page language: EN

Causes

  • Blown fuse or faulty relay for NOx sensor/heater supply
  • Open or shorted wiring in NOx sensor supply or ground circuit (Bank 2 Sensor 1)
  • Corroded, loose, or damaged connector at the NOx sensor or inline connector
  • Failed NOx sensor (internal heater or electronics)
  • Faulty ECM power/ground or driver circuit
  • Aftertreatment harness damage from heat or road debris

Symptoms

  • Malfunction Indicator Lamp (MIL) or check engine light illuminated
  • Possible reduced aftertreatment performance or inability to complete regenerations (diesel systems)
  • Emissions test failure or active fault codes related to NOx/aftertreatment
  • Erratic engine/aftertreatment behavior if ECM enters limp/emission-protection mode
  • Dashboard aftertreatment/DEF warnings (vehicle-specific)

What to check

  • Retrieve freeze frame and full DTC list with a scan tool; note related NOx or aftertreatment codes
  • Verify battery voltage and system charging (12–14.5 V nominal) before testing
  • Visually inspect wiring and connectors for Bank 2 Sensor 1 for damage, corrosion, heat melt, or water intrusion
  • Check fuses and relays associated with sensor/heater power
  • Wiggle test harness and connector while monitoring live data to reproduce fault
  • Compare live NOx sensor readings (if available) and heater status for Bank 2 Sensor 1 to Bank 1 Sensor 1

Signal parameters

  • Heater/supply when commanded: approximately battery voltage (typical 11–14.5 V) at the supply pin — varies by vehicle
  • Open-circuit heater: very high/infinite resistance when disconnected
  • Short to ground: near 0 V at supply pin when command is active
  • ECM command output: diagnostic data shows heater on/off (refer to manufacturer service data for exact thresholds)
  • Sensor signal output ranges vary by sensor design — consult service manual for expected mV/V values

Diagnostic algorithm

  1. Confirm the P220C code and capture freeze-frame/live data. Note any additional NOx or powertrain codes.
  2. Check battery and charging voltage; ensure good battery condition before electrical tests.
  3. Locate the Bank 2 Sensor 1 connector and visually inspect for corrosion, bent pins, heat damage, or water ingress. Repair or replace damaged connector as needed.
  4. With ignition ON (engine OFF) and using a DVOM, measure supply voltage at the sensor supply pin. Command the heater ON with a CAN scan tool if available and verify supply rises to near battery voltage.
  5. Measure resistance of the heater element at the sensor (manufacturer specification). An open or out-of-spec reading indicates a failed heater/sensor.
  6. Perform continuity checks from the sensor supply and ground pins back to the appropriate fuse/relay and ECM pins; look for shorts to battery or chassis ground.
  7. Inspect/test related fuse(s) and relay(s). Replace any blown fuse and test relay operation.
  8. If wiring and power/ground check good, swap with a known-good identical sensor (if available) or replace the sensor and clear codes.
  9. After repairs, clear codes and perform a drive cycle or run the required diagnostics to confirm the fault does not return. If intermittent, monitor live data and repeat wiggle tests.
  10. If wiring and sensor check OK, check ECM power/ground and driver outputs; consult manufacturer service information before replacing ECM.

Likely causes

  • Damaged/loose connector at Bank 2 Sensor 1
  • Open or shorted supply/ground wire to the NOx sensor
  • Blown fuse or failed supply relay for the NOx sensor heater
  • Failed NOx sensor heater or internal electronics

Fault status

⚠️ Status
P220C - NOx Sensor Supply Voltage Circuit Bank 2 Sensor 1 (Supply/Heater circuit abnormal: open/short/high/low)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P2200 P2201 P2202 P2203 P2204
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