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Home / DTC / P044C — EGR Sensor C Circuit Low

P044C — EGR Sensor C Circuit Low

Detailed page for trouble code P044C.

34,332codes
59brands
11,841generic
22,491specific
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P044C

Generic P — Powertrain

EGR Sensor C Circuit Low

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to ground on the EGR Sensor C signal circuit
  • Failed EGR Sensor C (position/potentiometer or pressure sensor)
  • Damaged or corroded connector or wiring (chafing, pin pushed out)
  • Poor or missing sensor/PCM ground or reference voltage
  • Intermittent connector contact or water intrusion
  • PCM internal fault or software issue (less common)

Symptoms

  • Check Engine Light / MIL illuminated
  • Possible reduced engine performance or hesitation
  • Rough idle or stalling in some cases
  • Poor emissions or failed emissions test
  • EGR-related drivability issues (knock/ping under load) depending on system

What to check

  • Read freeze frame and freeze data, note conditions when code set
  • Visual inspection of EGR sensor C connector and wiring for damage, corrosion, or fluid intrusion
  • Backprobe signal, reference (usually 5 V) and ground at sensor connector with key ON, engine OFF
  • Verify signal voltage while commanding EGR or during normal operation using a scan tool
  • Check continuity/resistance of signal wire to PCM and for short to ground with harness disconnected
  • Wiggle test harness while monitoring live data to reproduce intermittent failures

Signal parameters

  • Expected reference voltage: approximately 5 V (key ON, engine OFF) on the sensor reference terminal
  • Expected sensor output: typically 0.5–4.5 V range depending on valve position or pressure; low fault when signal near 0–0.2 V
  • Expected sensor ground: near 0 V with good continuity to chassis and PCM ground
  • Resistance/continuity: signal circuit to PCM should show high resistance (open) only through expected sensor path; short to ground shows near 0 Ω

Diagnostic algorithm

  1. Retrieve freeze frame, note engine conditions, and clear code. See if code returns immediately or intermittently.
  2. Perform a visual inspection of the EGR Sensor C connector, wiring harness along full route, and the sensor body for contamination or damage.
  3. Backprobe the sensor connector: verify 5 V reference present, sensor ground continuity, and measure signal voltage with key ON and engine OFF.
  4. With harness disconnected from the sensor, measure resistance between the signal pin and chassis ground. A low resistance indicates a short to ground in the harness.
  5. If reference or ground is missing, trace wiring back to PCM and repair connector/grounds as needed. Repair any chafed or damaged wires.
  6. If reference and ground are good but signal remains low when sensor connected, swap in a known-good identical EGR sensor (if available) or replace the sensor.
  7. After repairs, clear codes and perform functional tests: command the EGR (if controller supports it) while monitoring sensor signal to confirm proper response.
  8. If wiring and sensor check good but fault remains, test or substitute the PCM connector/PCM as a last step and check for software/TSB updates.

Likely causes

  • Signal wire shorted to chassis ground due to damaged insulation
  • EGR sensor internal electronics failure producing near-zero output
  • Connector corrosion or bent pins preventing proper signal return
  • Lost 5V reference or sensor ground from wiring fault
  • Aftermarket work or recent repairs that disturbed the harness

Fault status

⚠️ Status
Engine Control Module detected low voltage on the EGR Sensor C circuit. MIL on and code stored. Electrical fault suspected in sensor circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P044C

LAND ROVER P — Powertrain

Exhaust Gas Recirculation Sensor C - low circuit. - Low circuit

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

Causes

  • Short to ground on the EGR Sensor C signal circuit
  • Failed EGR Sensor C (position/potentiometer or pressure sensor)
  • Damaged or corroded connector or wiring (chafing, pin pushed out)
  • Poor or missing sensor/PCM ground or reference voltage
  • Intermittent connector contact or water intrusion
  • PCM internal fault or software issue (less common)

Symptoms

  • Check Engine Light / MIL illuminated
  • Possible reduced engine performance or hesitation
  • Rough idle or stalling in some cases
  • Poor emissions or failed emissions test
  • EGR-related drivability issues (knock/ping under load) depending on system

What to check

  • Read freeze frame and freeze data, note conditions when code set
  • Visual inspection of EGR sensor C connector and wiring for damage, corrosion, or fluid intrusion
  • Backprobe signal, reference (usually 5 V) and ground at sensor connector with key ON, engine OFF
  • Verify signal voltage while commanding EGR or during normal operation using a scan tool
  • Check continuity/resistance of signal wire to PCM and for short to ground with harness disconnected
  • Wiggle test harness while monitoring live data to reproduce intermittent failures

Signal parameters

  • Expected reference voltage: approximately 5 V (key ON, engine OFF) on the sensor reference terminal
  • Expected sensor output: typically 0.5–4.5 V range depending on valve position or pressure; low fault when signal near 0–0.2 V
  • Expected sensor ground: near 0 V with good continuity to chassis and PCM ground
  • Resistance/continuity: signal circuit to PCM should show high resistance (open) only through expected sensor path; short to ground shows near 0 Ω

Diagnostic algorithm

  1. Retrieve freeze frame, note engine conditions, and clear code. See if code returns immediately or intermittently.
  2. Perform a visual inspection of the EGR Sensor C connector, wiring harness along full route, and the sensor body for contamination or damage.
  3. Backprobe the sensor connector: verify 5 V reference present, sensor ground continuity, and measure signal voltage with key ON and engine OFF.
  4. With harness disconnected from the sensor, measure resistance between the signal pin and chassis ground. A low resistance indicates a short to ground in the harness.
  5. If reference or ground is missing, trace wiring back to PCM and repair connector/grounds as needed. Repair any chafed or damaged wires.
  6. If reference and ground are good but signal remains low when sensor connected, swap in a known-good identical EGR sensor (if available) or replace the sensor.
  7. After repairs, clear codes and perform functional tests: command the EGR (if controller supports it) while monitoring sensor signal to confirm proper response.
  8. If wiring and sensor check good but fault remains, test or substitute the PCM connector/PCM as a last step and check for software/TSB updates.

Likely causes

  • Signal wire shorted to chassis ground due to damaged insulation
  • EGR sensor internal electronics failure producing near-zero output
  • Connector corrosion or bent pins preventing proper signal return
  • Lost 5V reference or sensor ground from wiring fault
  • Aftermarket work or recent repairs that disturbed the harness

Fault status

⚠️ Status
Engine Control Module detected low voltage on the EGR Sensor C circuit. MIL on and code stored. Electrical fault suspected in sensor circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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P0400 P0401 P0402 P0405 P0406 P0407
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