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Home / DTC / P2206 — NOx Sensor Heater Control Circuit Low Bank 1 Sensor 1

P2206 — NOx Sensor Heater Control Circuit Low Bank 1 Sensor 1

Detailed page for trouble code P2206.

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Code

P2206

Generic P — Powertrain

NOx Sensor Heater Control Circuit Low Bank 1 Sensor 1

Brand: Generic
Type: P — Powertrain
Views: UK: 18 EN: 34 RU: 19
AI status
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Page language: EN

Causes

  • Open or shorted heater element inside the NOx sensor
  • Broken, corroded or disconnected wiring or connector at the sensor
  • Blown fuse or faulty relay powering the sensor heater
  • Poor or intermittent ground at the heater control circuit
  • Faulty ECM output driver (rare)
  • Water, soot or contamination of the sensor connector

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Reduced emissions control performance or failed emissions test
  • Possible limp mode or reduced engine performance on some vehicles
  • Irregular diesel particulate filter (DPF) or SCR system behavior (diesel vehicles)
  • Stored diagnostic trouble code P2206 (and possibly related NOx heater codes)

What to check

  • Read freeze frame and live data with a scan tool; confirm P2206 presence and any related codes
  • Visual inspection of sensor connector and wiring for damage, corrosion, melting, or disconnection
  • Check relevant fuses and relays for the NOx/heater circuit
  • Backprobe heater supply and control wires with key on to verify battery voltage and control signal
  • Measure heater element resistance at the sensor (with sensor disconnected)
  • Perform continuity checks from ECM connector to sensor connector for supply, control, and ground

Signal parameters

  • Heater supply voltage: near battery voltage with key on (typically ~11–14 V) at the fuse/relay feed
  • Heater element resistance: typically low (often around 1–30 ohms) — vehicle-specific; an open or very high resistance indicates failure
  • Heater current: when driven the ECM may allow several hundred milliamps to a few amps (vehicle-specific)
  • Control signal: may be a switched ground or PWM driver from ECM; expect switching activity when heater is active
  • Diagnostic threshold: ECM flags 'low' when measured voltage/current across the heater circuit is below a programmed threshold

Diagnostic algorithm

  1. Retrieve trouble codes and any freeze frame data with a scan tool. Note related codes for other NOx sensors or heater circuits.
  2. Perform a visual inspection of Bank 1 Sensor 1 harness and connector. Repair obvious damage, water ingress, or corrosion.
  3. Check fuses and relays that supply the NOx heater. Replace any blown fuses and retest.
  4. With ignition on (engine off), backprobe the sensor connector to verify battery supply voltage at the heater supply pin and check for proper ground or control signal at the heater control pin.
  5. Disconnect the sensor and measure heater element resistance across the heater terminals. Compare to vehicle-specific specification; an open or very high reading indicates a bad sensor.
  6. Perform continuity and short-to-ground checks for heater supply and control wiring between the sensor connector and ECM. Repair shorts/opens as required.
  7. If wiring and supply are good but heater does not draw expected current when commanded, test ECM output for proper switching. If ECM output is confirmed faulty, follow OEM procedures for ECM diagnosis/repair.
  8. After repairs or sensor replacement, clear codes and perform a drive cycle or required relearn procedure. Verify code does not return and that heater operation is normal in live data.
  9. Safety note: disconnect battery before performing connector repairs or when instructed by OEM procedures; avoid damaging emission control components.

Likely causes

  • Damaged connector or wiring harness between ECM and Bank 1 Sensor 1
  • Failed NOx sensor heater element (open/very high resistance)
  • Blown fuse or failed heater supply (relay/fuse)
  • Corroded or poor ground connection for the heater circuit

Fault status

⚠️ Status
P2206 - NOx Sensor Heater Control Circuit Low (Bank 1 Sensor 1)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P2201 P2202 P2203 P2204 P2205 P2207
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