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Home / DTC / P041C — EGR Temperature Sensor B Circuit Low

P041C — EGR Temperature Sensor B Circuit Low

Detailed page for trouble code P041C.

34,405codes
59brands
11,914generic
22,491specific
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P041C

Generic P — Powertrain

EGR Temperature Sensor B Circuit Low

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

Causes

  • Short to ground on the EGR temperature sensor B signal wire
  • Open or high-resistance connection in the sensor circuit
  • Failed EGR temperature sensor (thermistor shorted or out-of-spec)
  • Corroded, damaged, or disconnected connector
  • Faulty ECM or poor ECM reference/ground (less common)
  • Water intrusion or contamination at the sensor or connector

Symptoms

  • Check Engine Light (MIL) illuminated
  • Stored P041C diagnostic trouble code
  • Possible reduced or disabled EGR operation (depending on strategy)
  • Rough idle or hesitation if EGR is disabled
  • Increased NOx/emissions or failed emissions test
  • Intermittent faults if wiring is damaged/loose

What to check

  • Retrieve freeze frame and live data with a scan tool; observe EGR temperature B sensor value and compare to other related temps
  • Perform a visual inspection of the sensor, connector, and wiring for damage, corrosion, or water ingress
  • Backprobe the sensor connector to measure signal voltage with ignition on and engine operating (or per service manual)
  • Measure sensor resistance at ambient temperature with connector disconnected (compare to spec or expected thermistor behaviour)
  • Wiggle test wiring while monitoring live data to identify intermittent opens/shorts
  • Check ECM grounds and reference voltages for integrity

Signal parameters

  • Typical sensor type: NTC thermistor (resistance decreases as temperature increases)
  • Typical signal voltage range (vehicle dependent): ~0.1–4.5 V across operating temperature range
  • Typical mid-range (around 20–25°C): ~2.0–3.0 V (consult vehicle spec for exact values)
  • Resistance at ~25°C: commonly in the low kΩ range (often ~2–20 kΩ depending on design) — verify OEM spec
  • Low-circuit condition: signal voltage significantly below expected at a given temp or near 0 V (indicates short to ground or sensor failure)

Diagnostic algorithm

  1. Connect an OEM-compatible scan tool and confirm P041C is current or stored. Record freeze-frame data and live EGR temp B readings.
  2. Visually inspect the EGR temp B sensor, harness, and connector for damage, corrosion, pin push-out, or contamination. Repair any obvious faults and retest.
  3. With ignition off, disconnect the sensor. Inspect connector pins and measure resistance of the sensor across its terminals. Compare resistance to expected thermistor behaviour (resistance should change with temperature).
  4. With ignition on (engine off) backprobe the signal wire and measure voltage between signal and ground. Confirm the presence of expected reference/pull-up voltage (refer to service manual).
  5. Start engine and monitor live EGR temp B voltage/temperature. Perform a wiggle test on harness and connector while watching for intermittent changes.
  6. Check for shorts to ground: disconnect sensor and measure continuity between signal wire and chassis ground. No direct short should be present. If continuity exists, trace and repair the short.
  7. If wiring and connector are OK but sensor readings are out of range, install a known-good replacement sensor and retest.
  8. If replacement sensor does not clear code and wiring checks good, inspect ECU pins and grounds; consider ECU testing or replacement as last resort.
  9. After repairs, clear codes and perform a test drive to confirm the fault does not return and that live data behaves normally.

Likely causes

  • Damaged wiring harness rubbing through and contacting chassis ground
  • Failed sensor element (thermistor shorted internally)
  • Loose or corroded connector pins causing low-voltage reading
  • Connector pin pushed out or mis-mated
  • Previous repair or routing error (pinched wire)

Fault status

⚠️ Status
P041C — EGR Temperature Sensor B Circuit Low: Control module detects sensor circuit voltage below expected range (low signal), suggesting a short to ground, open/failed sensor, or wiring/connector fault. Further diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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P041A P041B P041D P0117 P0118
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Code

P041C

ISUZU P — Powertrain

Intake Manifold Temperature Sensor Circuit High

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

Causes

  • Short to ground on the EGR temperature sensor B signal wire
  • Open or high-resistance connection in the sensor circuit
  • Failed EGR temperature sensor (thermistor shorted or out-of-spec)
  • Corroded, damaged, or disconnected connector
  • Faulty ECM or poor ECM reference/ground (less common)
  • Water intrusion or contamination at the sensor or connector

Symptoms

  • Check Engine Light (MIL) illuminated
  • Stored P041C diagnostic trouble code
  • Possible reduced or disabled EGR operation (depending on strategy)
  • Rough idle or hesitation if EGR is disabled
  • Increased NOx/emissions or failed emissions test
  • Intermittent faults if wiring is damaged/loose

What to check

  • Retrieve freeze frame and live data with a scan tool; observe EGR temperature B sensor value and compare to other related temps
  • Perform a visual inspection of the sensor, connector, and wiring for damage, corrosion, or water ingress
  • Backprobe the sensor connector to measure signal voltage with ignition on and engine operating (or per service manual)
  • Measure sensor resistance at ambient temperature with connector disconnected (compare to spec or expected thermistor behaviour)
  • Wiggle test wiring while monitoring live data to identify intermittent opens/shorts
  • Check ECM grounds and reference voltages for integrity

Signal parameters

  • Typical sensor type: NTC thermistor (resistance decreases as temperature increases)
  • Typical signal voltage range (vehicle dependent): ~0.1–4.5 V across operating temperature range
  • Typical mid-range (around 20–25°C): ~2.0–3.0 V (consult vehicle spec for exact values)
  • Resistance at ~25°C: commonly in the low kΩ range (often ~2–20 kΩ depending on design) — verify OEM spec
  • Low-circuit condition: signal voltage significantly below expected at a given temp or near 0 V (indicates short to ground or sensor failure)

Diagnostic algorithm

  1. Connect an OEM-compatible scan tool and confirm P041C is current or stored. Record freeze-frame data and live EGR temp B readings.
  2. Visually inspect the EGR temp B sensor, harness, and connector for damage, corrosion, pin push-out, or contamination. Repair any obvious faults and retest.
  3. With ignition off, disconnect the sensor. Inspect connector pins and measure resistance of the sensor across its terminals. Compare resistance to expected thermistor behaviour (resistance should change with temperature).
  4. With ignition on (engine off) backprobe the signal wire and measure voltage between signal and ground. Confirm the presence of expected reference/pull-up voltage (refer to service manual).
  5. Start engine and monitor live EGR temp B voltage/temperature. Perform a wiggle test on harness and connector while watching for intermittent changes.
  6. Check for shorts to ground: disconnect sensor and measure continuity between signal wire and chassis ground. No direct short should be present. If continuity exists, trace and repair the short.
  7. If wiring and connector are OK but sensor readings are out of range, install a known-good replacement sensor and retest.
  8. If replacement sensor does not clear code and wiring checks good, inspect ECU pins and grounds; consider ECU testing or replacement as last resort.
  9. After repairs, clear codes and perform a test drive to confirm the fault does not return and that live data behaves normally.

Likely causes

  • Damaged wiring harness rubbing through and contacting chassis ground
  • Failed sensor element (thermistor shorted internally)
  • Loose or corroded connector pins causing low-voltage reading
  • Connector pin pushed out or mis-mated
  • Previous repair or routing error (pinched wire)

Fault status

⚠️ Status
P041C — EGR Temperature Sensor B Circuit Low: Control module detects sensor circuit voltage below expected range (low signal), suggesting a short to ground, open/failed sensor, or wiring/connector fault. Further diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P041A P041B P041D P0117 P0118
Repair manuals

Manual library for ISUZU

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Code

P041C

LAND ROVER P — Powertrain

Exhaust gas recirculation temperature sensor B - low circuit

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

Causes

  • Short to ground on the EGR temperature sensor B signal wire
  • Open or high-resistance connection in the sensor circuit
  • Failed EGR temperature sensor (thermistor shorted or out-of-spec)
  • Corroded, damaged, or disconnected connector
  • Faulty ECM or poor ECM reference/ground (less common)
  • Water intrusion or contamination at the sensor or connector

Symptoms

  • Check Engine Light (MIL) illuminated
  • Stored P041C diagnostic trouble code
  • Possible reduced or disabled EGR operation (depending on strategy)
  • Rough idle or hesitation if EGR is disabled
  • Increased NOx/emissions or failed emissions test
  • Intermittent faults if wiring is damaged/loose

What to check

  • Retrieve freeze frame and live data with a scan tool; observe EGR temperature B sensor value and compare to other related temps
  • Perform a visual inspection of the sensor, connector, and wiring for damage, corrosion, or water ingress
  • Backprobe the sensor connector to measure signal voltage with ignition on and engine operating (or per service manual)
  • Measure sensor resistance at ambient temperature with connector disconnected (compare to spec or expected thermistor behaviour)
  • Wiggle test wiring while monitoring live data to identify intermittent opens/shorts
  • Check ECM grounds and reference voltages for integrity

Signal parameters

  • Typical sensor type: NTC thermistor (resistance decreases as temperature increases)
  • Typical signal voltage range (vehicle dependent): ~0.1–4.5 V across operating temperature range
  • Typical mid-range (around 20–25°C): ~2.0–3.0 V (consult vehicle spec for exact values)
  • Resistance at ~25°C: commonly in the low kΩ range (often ~2–20 kΩ depending on design) — verify OEM spec
  • Low-circuit condition: signal voltage significantly below expected at a given temp or near 0 V (indicates short to ground or sensor failure)

Diagnostic algorithm

  1. Connect an OEM-compatible scan tool and confirm P041C is current or stored. Record freeze-frame data and live EGR temp B readings.
  2. Visually inspect the EGR temp B sensor, harness, and connector for damage, corrosion, pin push-out, or contamination. Repair any obvious faults and retest.
  3. With ignition off, disconnect the sensor. Inspect connector pins and measure resistance of the sensor across its terminals. Compare resistance to expected thermistor behaviour (resistance should change with temperature).
  4. With ignition on (engine off) backprobe the signal wire and measure voltage between signal and ground. Confirm the presence of expected reference/pull-up voltage (refer to service manual).
  5. Start engine and monitor live EGR temp B voltage/temperature. Perform a wiggle test on harness and connector while watching for intermittent changes.
  6. Check for shorts to ground: disconnect sensor and measure continuity between signal wire and chassis ground. No direct short should be present. If continuity exists, trace and repair the short.
  7. If wiring and connector are OK but sensor readings are out of range, install a known-good replacement sensor and retest.
  8. If replacement sensor does not clear code and wiring checks good, inspect ECU pins and grounds; consider ECU testing or replacement as last resort.
  9. After repairs, clear codes and perform a test drive to confirm the fault does not return and that live data behaves normally.

Likely causes

  • Damaged wiring harness rubbing through and contacting chassis ground
  • Failed sensor element (thermistor shorted internally)
  • Loose or corroded connector pins causing low-voltage reading
  • Connector pin pushed out or mis-mated
  • Previous repair or routing error (pinched wire)

Fault status

⚠️ Status
P041C — EGR Temperature Sensor B Circuit Low: Control module detects sensor circuit voltage below expected range (low signal), suggesting a short to ground, open/failed sensor, or wiring/connector fault. Further diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P041A P041B P041D P0117 P0118
320

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