Code
P044C
Generic
P — Powertrain
EGR Sensor C Circuit Low
Views:
UK: 12
EN: 21
RU: 9
AI status
Completed
Completed
100%
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
- Retrieve freeze frame, note engine conditions, and clear code. See if code returns immediately or intermittently.
- Perform a visual inspection of the EGR Sensor C connector, wiring harness along full route, and the sensor body for contamination or damage.
- Backprobe the sensor connector: verify 5 V reference present, sensor ground continuity, and measure signal voltage with key ON and engine OFF.
- 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.
- If reference or ground is missing, trace wiring back to PCM and repair connector/grounds as needed. Repair any chafed or damaged wires.
- 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.
- After repairs, clear codes and perform functional tests: command the EGR (if controller supports it) while monitoring sensor signal to confirm proper response.
- 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
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P044C
LAND ROVER
P — Powertrain
Exhaust Gas Recirculation Sensor C - low circuit. - Low circuit
Views:
UK: 4
EN: 9
RU: 3
AI status
Completed
Completed
100%
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
- Retrieve freeze frame, note engine conditions, and clear code. See if code returns immediately or intermittently.
- Perform a visual inspection of the EGR Sensor C connector, wiring harness along full route, and the sensor body for contamination or damage.
- Backprobe the sensor connector: verify 5 V reference present, sensor ground continuity, and measure signal voltage with key ON and engine OFF.
- 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.
- If reference or ground is missing, trace wiring back to PCM and repair connector/grounds as needed. Repair any chafed or damaged wires.
- 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.
- After repairs, clear codes and perform functional tests: command the EGR (if controller supports it) while monitoring sensor signal to confirm proper response.
- 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
Similar codes
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 1
LAND ROVER 2015 Discovery Sport HSE
HTML ManualWorkshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
