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Home / DTC / P044D — Exhaust Gas Recirculation Sensor C - high circuit - High circuit

P044D — Exhaust Gas Recirculation Sensor C - high circuit - High circuit

Detailed page for trouble code P044D.

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P044D

LAND ROVER P — Powertrain

Exhaust Gas Recirculation Sensor C - high circuit - High circuit

Brand: LAND ROVER
Type: P — Powertrain
AI status
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Completed 100%
Page language: EN

Causes

  • Open or shorted wiring (short to battery/ignition voltage)
  • Poor or corroded connector or pin at EGR sensor C
  • Failed EGR sensor (internal electronics)
  • Poor sensor ground or high resistance in ground circuit
  • ECM input circuit fault
  • Related mechanical issues causing abnormal sensor outputs (stuck EGR valve or contamination)

Symptoms

  • MIL/Check Engine light illuminated
  • Reduced engine performance or limp mode on some vehicles
  • Irregular idle, hesitation, or rough running if EGR not operating correctly
  • Failed emissions test
  • Stored related freeze-frame data (engine load, rpm, temperature) in PCM

What to check

  • Read and record freeze frame and live data with a scan tool (EGR sensor C voltage/position)
  • Visually inspect EGR sensor connector, pins and wiring for corrosion, damage, or disconnection
  • Backprobe signal wire and monitor voltage with ignition ON, engine OFF
  • Check sensor ground for continuity to chassis/ECM ground
  • Check for short to battery by measuring voltage on signal wire relative to ground
  • Wiggle harness while monitoring to detect intermittent faults

Signal parameters

  • Reference supply: typically +5 V (verify exact value for vehicle)
  • Expected sensor signal range: about 0.5 V to 4.5 V (varies by design) — code triggers when signal exceeds calibrated high threshold
  • Typical behavior: sensor voltage should change smoothly with EGR position (voltage increases as EGR opens for voltage-type position sensor)
  • Ground continuity: near 0 ohms to chassis/ECM ground; any significant resistance may affect signal

Diagnostic algorithm

  1. Retrieve codes and freeze-frame data with a diagnostic scanner; note engine temperature, RPM, throttle position and other PIDs when code set.
  2. Visually inspect the EGR sensor C connector and harness for corrosion, bent pins, melted insulation or repairs. Repair as needed.
  3. With ignition ON (engine OFF), backprobe the signal wire at the sensor and measure voltage. If voltage is above the expected range (close to battery voltage), suspect short to +B or failed sensor.
  4. Check reference voltage from ECM to sensor (should be ~5 V or manufacturer-specified). If reference absent, test ECM output and related fuses/power feeds.
  5. Measure continuity/resistance between sensor ground and chassis/ECM ground. Repair any high-resistance grounds.
  6. Inspect and test the signal wire for short to power: disconnect sensor harness and measure voltage at the harness connector. If signal still high with sensor disconnected, wiring is shorted to battery voltage upstream — trace and repair.
  7. If wiring checks good, swap with a known-good identical sensor (if available) or bench-test sensor per manufacturer procedure. Replace sensor if it fails.
  8. If wiring and sensor test good, suspect ECM input fault. Confirm with a second technician or manufacturer diagnostic information before replacing ECM.
  9. After repairs, clear codes and perform required drive cycle or active tests to confirm the fault does not return.
  10. Safety note: avoid shorting terminals when probing; disconnect battery when repairing wiring.

Likely causes

  • Connector corrosion or bent pins at the EGR sensor harness
  • Short to battery voltage on the sensor signal wire
  • Defective EGR position sensor C (internal short or failed regulator)
  • Bad ground at sensor or shared ground point with high resistance
  • Wiring chafe or damage near engine harness causing intermittent shorts

Fault status

⚠️ Status
EGR Sensor C signal circuit reports a high-voltage/over-range condition; ECM has flagged EGR sensor C circuit high.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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