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Home / DTC / P22D6 — Turbocharger Intake Valve Position Sensor Circuit low turbo compressor

P22D6 — Turbocharger Intake Valve Position Sensor Circuit low turbo compressor

Detailed page for trouble code P22D6.

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P22D6

LAND ROVER P — Powertrain

Turbocharger Intake Valve Position Sensor Circuit low turbo compressor

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 0 EN: 5 RU: 2
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Page language: EN

Causes

  • Open or short in sensor wiring or connector
  • Corroded or loose connector terminals
  • Faulty intake valve position sensor (Hall effect or potentiometer)
  • Stuck or mechanically binding intake valve/actuator
  • Faulty turbo actuator (electric or vacuum)
  • Low reference voltage or bad ground from ECM

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power or limp-home mode
  • Low or no turbo boost (underboost)
  • Poor throttle response and sluggish acceleration
  • Possible increased exhaust smoke or unusual turbo noise
  • Stored related turbo/intake diagnostic trouble codes

What to check

  • Read and record all stored DTCs and freeze frame data with a capable scanner
  • Check live data: intake valve position sensor value and commanded position
  • Inspect sensor connector for corrosion, bent pins, or water ingress
  • Visually inspect wiring harness for damage, chafing, or repairs
  • Measure reference voltage and ground at sensor connector with key ON, engine OFF
  • Backprobe signal wire while commanding valve open/close and observe change

Signal parameters

  • Typical sensor type: position sensor (Hall effect or potentiometer) with 3 wires: 5 V reference, ground, signal
  • Reference voltage: ~4.8–5.2 V (key ON, engine OFF) — verify to OEM spec
  • Signal voltage range (typical): ~0.5 V (closed position) to ~4.5 V (open position) — values vary by model
  • Expected behavior: signal voltage should change smoothly and proportionally as valve is commanded across full travel
  • Sensor resistance (if potentiometer type): usually in the kiloohm range (check OEM spec)
  • No abrupt drop to 0 V or open circuit should occur when commanding valve movement

Diagnostic algorithm

  1. Retrieve DTCs and freeze frame data. Note related boost, MAP, and actuator codes.
  2. Using a scan tool, view live data: observe 'intake valve position' and 'desired/commanded position' while attempting to change boost or while commanding the actuator. Confirm if sensor value is low and does not follow commanded position.
  3. Visually inspect sensor connector and harness for damage, contamination, or poor sealing. Repair any obvious issues.
  4. With ignition ON (engine OFF), measure reference voltage at the sensor connector. If reference is missing or low, trace supply to ECM/fuse/relay.
  5. Measure sensor ground continuity to chassis/ECM ground. Repair any poor ground connections.
  6. Backprobe signal wire and record voltage while commanding valve closed and open. If signal does not change or stays near 0 V, suspect sensor, wiring short to ground, or mechanically stuck valve.
  7. Check continuity/resistance between sensor pins and the ECM connector to locate opens/shorts. Wiggle harness while observing signal for intermittent faults.
  8. If wiring and power/ground are good but signal is incorrect, remove and bench-test or replace the intake valve position sensor per OEM procedures.
  9. If sensor tests OK, command the actuator and verify valve moves freely. If actuator fails to move, test actuator power/ground and control circuit; inspect for seized valve or damaged turbo internals.
  10. After repair, clear codes and perform a road test or boost/actuator relearn procedure if required by OEM. Confirm sensor values follow commanded positions and no codes return.
  11. If all electrical/mechanical components check good and code persists, consider ECM software update or ECM diagnosis.

Likely causes

  • Damaged wiring between sensor and ECM (pin chafing, rodent damage)
  • Connector corrosion allowing intermittent low voltage
  • Failed position sensor producing near-zero voltage
  • Intake valve stuck closed causing sensor to read low position
  • Actuator not responding to commands due to failed motor/solenoid or lost power/ground

Fault status

⚠️ Status
Turbo intake valve position sensor circuit low — ECM detects abnormally low or no signal from turbocharger intake valve position sensor causing reduced/incorrect boost control.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1–3 hours

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