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Home / DTC / P0490 — EGR A Control Circuit High

P0490 — EGR A Control Circuit High

Detailed page for trouble code P0490.

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Code

P0490

Generic P — Powertrain

EGR A Control Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 16 EN: 19 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to battery voltage on the EGR control circuit
  • Corroded, damaged, or disconnected connector or wiring
  • Faulty EGR solenoid/actuator or valve
  • Poor or missing ground at the EGR circuit
  • Faulty ECM or driver transistor
  • Incorrect repairs or aftermarket modifications affecting wiring

Symptoms

  • Check Engine light (MIL) illuminated
  • Reduced engine performance or hesitation
  • Rough idle or increased idle variation
  • Poor fuel economy
  • Failed emissions test or increased exhaust emissions
  • Possible limp-home mode on some vehicles

What to check

  • Read and record freeze frame and live data with a scan tool; confirm P0490 and note related codes
  • Perform a visual inspection of EGR harness and connector for damage, corrosion, or water
  • Backprobe the EGR control connector and measure voltage and/or duty cycle while commanding the EGR ON/OFF with a scan tool
  • Measure coil resistance of the EGR solenoid/actuator (compare to manufacturer spec)
  • Check continuity between ECM pin and EGR connector pin; check for short to battery or open circuit
  • Wiggle test wiring while monitoring signal to see if fault is intermittent

Signal parameters

  • With key ON engine OFF: control circuit may show battery voltage or reference voltage depending on vehicle design; consult vehicle wiring diagram
  • When commanded OFF: output should be at the expected inactive level (low or high depending on driver type); a sustained higher-than-expected voltage indicates fault
  • When commanded ON: circuit should show a change (switch to ground, switch to supply, or PWM duty change) consistent with OEM expected behavior
  • Typical EGR solenoid coil resistance is often in the tens of ohms (commonly 10–60 Ω) — check the specific service data for the vehicle
  • Use oscilloscope to confirm expected PWM duty cycle or switched waveform when the ECM commands the valve

Diagnostic algorithm

  1. Connect a scan tool, confirm P0490 and note any additional EGR or related codes. Record freeze-frame/live data.
  2. Visually inspect EGR valve/solenoid, connector, and harness for damage, corrosion, loose pins, or heat damage.
  3. With battery voltage present, backprobe the connector. With key ON engine OFF, observe connector voltage. Compare to expected for that design (reference OEM data).
  4. Command the EGR ON/OFF from the scan tool. Observe the control signal change. If the signal is higher than expected when commanded, suspect short to voltage or driver fault.
  5. Remove connector and measure coil resistance of the EGR solenoid. If out of spec or open/shorted, replace the solenoid/valve.
  6. Check continuity between the EGR connector signal pin and the ECM pin. Check for short to battery (voltage present on harness when disconnected) and for short to ground.
  7. Verify good ground(s) for the EGR circuit. Repair any poor ground connections.
  8. If wiring and component test normal, consider ECM output driver failure. Before ECM replacement, confirm with wiring pin-to-pin tests and, if possible, substitute known-good ECM or perform bench/technical procedures per manufacturer.
  9. Repair or replace faulty wiring, connector, or EGR valve/solenoid. Clear codes and perform road/functional test to confirm repair and that the DTC does not return.

Likely causes

  • Pinched or chafed harness contacting a power source (short to 12V)
  • Water intrusion or corrosion in the EGR connector causing high voltage reading
  • Stuck/open EGR control valve with internal shorted coil
  • Loose or broken ground at the valve or engine block
  • ECM output stage failed and driving high

Fault status

⚠️ Status
EGR A control circuit voltage higher than expected; ECM detected abnormal high signal on EGR A control circuit and set DTC P0490.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0491 P0401 P0402 P0403 P0404
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Code

P0490

LAND ROVER P — Powertrain

Exhaust Gas Recirculation Control - High Circuit

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 7 EN: 10 RU: 16
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Short to battery voltage on the EGR control circuit
  • Corroded, damaged, or disconnected connector or wiring
  • Faulty EGR solenoid/actuator or valve
  • Poor or missing ground at the EGR circuit
  • Faulty ECM or driver transistor
  • Incorrect repairs or aftermarket modifications affecting wiring

Symptoms

  • Check Engine light (MIL) illuminated
  • Reduced engine performance or hesitation
  • Rough idle or increased idle variation
  • Poor fuel economy
  • Failed emissions test or increased exhaust emissions
  • Possible limp-home mode on some vehicles

What to check

  • Read and record freeze frame and live data with a scan tool; confirm P0490 and note related codes
  • Perform a visual inspection of EGR harness and connector for damage, corrosion, or water
  • Backprobe the EGR control connector and measure voltage and/or duty cycle while commanding the EGR ON/OFF with a scan tool
  • Measure coil resistance of the EGR solenoid/actuator (compare to manufacturer spec)
  • Check continuity between ECM pin and EGR connector pin; check for short to battery or open circuit
  • Wiggle test wiring while monitoring signal to see if fault is intermittent

Signal parameters

  • With key ON engine OFF: control circuit may show battery voltage or reference voltage depending on vehicle design; consult vehicle wiring diagram
  • When commanded OFF: output should be at the expected inactive level (low or high depending on driver type); a sustained higher-than-expected voltage indicates fault
  • When commanded ON: circuit should show a change (switch to ground, switch to supply, or PWM duty change) consistent with OEM expected behavior
  • Typical EGR solenoid coil resistance is often in the tens of ohms (commonly 10–60 Ω) — check the specific service data for the vehicle
  • Use oscilloscope to confirm expected PWM duty cycle or switched waveform when the ECM commands the valve

Diagnostic algorithm

  1. Connect a scan tool, confirm P0490 and note any additional EGR or related codes. Record freeze-frame/live data.
  2. Visually inspect EGR valve/solenoid, connector, and harness for damage, corrosion, loose pins, or heat damage.
  3. With battery voltage present, backprobe the connector. With key ON engine OFF, observe connector voltage. Compare to expected for that design (reference OEM data).
  4. Command the EGR ON/OFF from the scan tool. Observe the control signal change. If the signal is higher than expected when commanded, suspect short to voltage or driver fault.
  5. Remove connector and measure coil resistance of the EGR solenoid. If out of spec or open/shorted, replace the solenoid/valve.
  6. Check continuity between the EGR connector signal pin and the ECM pin. Check for short to battery (voltage present on harness when disconnected) and for short to ground.
  7. Verify good ground(s) for the EGR circuit. Repair any poor ground connections.
  8. If wiring and component test normal, consider ECM output driver failure. Before ECM replacement, confirm with wiring pin-to-pin tests and, if possible, substitute known-good ECM or perform bench/technical procedures per manufacturer.
  9. Repair or replace faulty wiring, connector, or EGR valve/solenoid. Clear codes and perform road/functional test to confirm repair and that the DTC does not return.

Likely causes

  • Pinched or chafed harness contacting a power source (short to 12V)
  • Water intrusion or corrosion in the EGR connector causing high voltage reading
  • Stuck/open EGR control valve with internal shorted coil
  • Loose or broken ground at the valve or engine block
  • ECM output stage failed and driving high

Fault status

⚠️ Status
EGR A control circuit voltage higher than expected; ECM detected abnormal high signal on EGR A control circuit and set DTC P0490.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0491 P0401 P0402 P0403 P0404
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Short description

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Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
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  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

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Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
Download

Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
Download
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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