Code
P0404
Generic
P — Powertrain
EGR A Control Circuit Range/Performance
Views:
UK: 38
EN: 73
RU: 71
AI status
Completed
Completed
100%
Causes
- Open/short or high resistance in EGR control wiring or connectors
- Faulty EGR valve, EGR position sensor, or EGR solenoid/actuator
- Clogged carbon buildup in EGR passages or EGR port restricting movement
- Failed EGR position sensor or incorrect feedback signal
- Vacuum supply leak or weak vacuum (vacuum‑operated EGR systems)
- Faulty PCM or EGR driver circuit
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power, hesitation or surging under load
- Rough idle or stalling, especially when warm
- Decreased fuel economy
- Failed emissions test (elevated NOx or other emissions)
- Intermittent drivability complaints depending on operating conditions
What to check
- Scan for P0404 and any related or pending codes; record freeze frame and live data
- Inspect EGR valve/solenoid connectors and wiring for corrosion, breaks, pin damage, or poor fit
- Backprobe EGR control and feedback pins to verify voltage, ground, and duty signals with a scope or DVOM
- Check EGR valve movement (vacuum or electric) while commanding EGR open/closed from a scan tool
- Inspect and clean EGR passages, ports, and intake for carbon blocking
- Verify vacuum supply and check for leaks on vacuum‑operated EGR systems
Signal parameters
- Command signal: PWM duty cycle 0–100% when commanded by PCM (varies with load and speed)
- Control voltage: 0–12 V for many solenoids (check vehicle specifics); feedback sensor typically 0–5 V
- EGR position sensor feedback: usually 0.5–4.5 V range proportional to position
- At idle with EGR closed: command low duty/voltage and feedback near closed position; when commanded open, feedback should change noticeably
- Resistance of typical EGR solenoid: often tens to hundreds of ohms (refer to OEM spec)
Diagnostic algorithm
- Retrieve DTCs and freeze frame. Note engine conditions when fault set (temp, load, RPM).
- Visually inspect EGR valve/solenoid, harness, and connector for damage, corrosion, or loose pins.
- With a scan tool, monitor EGR command (duty/voltage) and EGR feedback/position while commanding EGR on/off. Confirm feedback changes appropriately.
- Backprobe the connector and verify power and ground are present at the component with ignition on and engine off as specified.
- Measure solenoid/actuator resistance; compare to spec. If out of range, replace the component.
- Operate the EGR valve manually (apply vacuum or test voltage) to confirm movement and verify flow to intake. If stuck, remove and clean port/valve or replace if mechanically failed.
- Inspect and clean EGR passages and intake ports of carbon deposits that could prevent correct operation.
- If wiring is suspected, perform wiggle tests, continuity and voltage drop tests, and repair any damaged wiring or connectors.
- If control signal from PCM is absent or incorrect but wiring to component is good, consider PCM driver failure — confirm with scope or known‑good module before replacing.
- Clear codes and perform test drive to confirm repair; recheck for recurrence and related codes.
Likely causes
- Corroded or damaged connector/pin at EGR valve/solenoid
- Stuck or mechanically seized EGR valve due to carbon deposits
- Failed EGR solenoid/actuator that does not respond to command
- Broken or shorted harness between PCM and EGR component
- Bad EGR position sensor producing out‑of‑range feedback
Fault status
Status
PCM detected EGR A control or feedback signal out of expected range/performance. EGR command and/or position is not matching expected values, indicating a control circuit, actuator, sensor, or mechanical restriction issue.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P0404
GWM
P — Powertrain
- Incorrect indicator / not adjusted Exhaust gas recirculation sensor
Views:
UK: 24
EN: 42
RU: 32
AI status
Completed
Completed
100%
Causes
- Open/short or high resistance in EGR control wiring or connectors
- Faulty EGR valve, EGR position sensor, or EGR solenoid/actuator
- Clogged carbon buildup in EGR passages or EGR port restricting movement
- Failed EGR position sensor or incorrect feedback signal
- Vacuum supply leak or weak vacuum (vacuum‑operated EGR systems)
- Faulty PCM or EGR driver circuit
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power, hesitation or surging under load
- Rough idle or stalling, especially when warm
- Decreased fuel economy
- Failed emissions test (elevated NOx or other emissions)
- Intermittent drivability complaints depending on operating conditions
What to check
- Scan for P0404 and any related or pending codes; record freeze frame and live data
- Inspect EGR valve/solenoid connectors and wiring for corrosion, breaks, pin damage, or poor fit
- Backprobe EGR control and feedback pins to verify voltage, ground, and duty signals with a scope or DVOM
- Check EGR valve movement (vacuum or electric) while commanding EGR open/closed from a scan tool
- Inspect and clean EGR passages, ports, and intake for carbon blocking
- Verify vacuum supply and check for leaks on vacuum‑operated EGR systems
Signal parameters
- Command signal: PWM duty cycle 0–100% when commanded by PCM (varies with load and speed)
- Control voltage: 0–12 V for many solenoids (check vehicle specifics); feedback sensor typically 0–5 V
- EGR position sensor feedback: usually 0.5–4.5 V range proportional to position
- At idle with EGR closed: command low duty/voltage and feedback near closed position; when commanded open, feedback should change noticeably
- Resistance of typical EGR solenoid: often tens to hundreds of ohms (refer to OEM spec)
Diagnostic algorithm
- Retrieve DTCs and freeze frame. Note engine conditions when fault set (temp, load, RPM).
- Visually inspect EGR valve/solenoid, harness, and connector for damage, corrosion, or loose pins.
- With a scan tool, monitor EGR command (duty/voltage) and EGR feedback/position while commanding EGR on/off. Confirm feedback changes appropriately.
- Backprobe the connector and verify power and ground are present at the component with ignition on and engine off as specified.
- Measure solenoid/actuator resistance; compare to spec. If out of range, replace the component.
- Operate the EGR valve manually (apply vacuum or test voltage) to confirm movement and verify flow to intake. If stuck, remove and clean port/valve or replace if mechanically failed.
- Inspect and clean EGR passages and intake ports of carbon deposits that could prevent correct operation.
- If wiring is suspected, perform wiggle tests, continuity and voltage drop tests, and repair any damaged wiring or connectors.
- If control signal from PCM is absent or incorrect but wiring to component is good, consider PCM driver failure — confirm with scope or known‑good module before replacing.
- Clear codes and perform test drive to confirm repair; recheck for recurrence and related codes.
Likely causes
- Corroded or damaged connector/pin at EGR valve/solenoid
- Stuck or mechanically seized EGR valve due to carbon deposits
- Failed EGR solenoid/actuator that does not respond to command
- Broken or shorted harness between PCM and EGR component
- Bad EGR position sensor producing out‑of‑range feedback
Fault status
Status
PCM detected EGR A control or feedback signal out of expected range/performance. EGR command and/or position is not matching expected values, indicating a control circuit, actuator, sensor, or mechanical restriction issue.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P0404
HUMMER
P — Powertrain
Exhaust Gas Recirculation (EGR) Open Position Performance
Views:
UK: 31
EN: 50
RU: 56
AI status
Completed
Completed
100%
Causes
- Open/short or high resistance in EGR control wiring or connectors
- Faulty EGR valve, EGR position sensor, or EGR solenoid/actuator
- Clogged carbon buildup in EGR passages or EGR port restricting movement
- Failed EGR position sensor or incorrect feedback signal
- Vacuum supply leak or weak vacuum (vacuum‑operated EGR systems)
- Faulty PCM or EGR driver circuit
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power, hesitation or surging under load
- Rough idle or stalling, especially when warm
- Decreased fuel economy
- Failed emissions test (elevated NOx or other emissions)
- Intermittent drivability complaints depending on operating conditions
What to check
- Scan for P0404 and any related or pending codes; record freeze frame and live data
- Inspect EGR valve/solenoid connectors and wiring for corrosion, breaks, pin damage, or poor fit
- Backprobe EGR control and feedback pins to verify voltage, ground, and duty signals with a scope or DVOM
- Check EGR valve movement (vacuum or electric) while commanding EGR open/closed from a scan tool
- Inspect and clean EGR passages, ports, and intake for carbon blocking
- Verify vacuum supply and check for leaks on vacuum‑operated EGR systems
Signal parameters
- Command signal: PWM duty cycle 0–100% when commanded by PCM (varies with load and speed)
- Control voltage: 0–12 V for many solenoids (check vehicle specifics); feedback sensor typically 0–5 V
- EGR position sensor feedback: usually 0.5–4.5 V range proportional to position
- At idle with EGR closed: command low duty/voltage and feedback near closed position; when commanded open, feedback should change noticeably
- Resistance of typical EGR solenoid: often tens to hundreds of ohms (refer to OEM spec)
Diagnostic algorithm
- Retrieve DTCs and freeze frame. Note engine conditions when fault set (temp, load, RPM).
- Visually inspect EGR valve/solenoid, harness, and connector for damage, corrosion, or loose pins.
- With a scan tool, monitor EGR command (duty/voltage) and EGR feedback/position while commanding EGR on/off. Confirm feedback changes appropriately.
- Backprobe the connector and verify power and ground are present at the component with ignition on and engine off as specified.
- Measure solenoid/actuator resistance; compare to spec. If out of range, replace the component.
- Operate the EGR valve manually (apply vacuum or test voltage) to confirm movement and verify flow to intake. If stuck, remove and clean port/valve or replace if mechanically failed.
- Inspect and clean EGR passages and intake ports of carbon deposits that could prevent correct operation.
- If wiring is suspected, perform wiggle tests, continuity and voltage drop tests, and repair any damaged wiring or connectors.
- If control signal from PCM is absent or incorrect but wiring to component is good, consider PCM driver failure — confirm with scope or known‑good module before replacing.
- Clear codes and perform test drive to confirm repair; recheck for recurrence and related codes.
Likely causes
- Corroded or damaged connector/pin at EGR valve/solenoid
- Stuck or mechanically seized EGR valve due to carbon deposits
- Failed EGR solenoid/actuator that does not respond to command
- Broken or shorted harness between PCM and EGR component
- Bad EGR position sensor producing out‑of‑range feedback
Fault status
Status
PCM detected EGR A control or feedback signal out of expected range/performance. EGR command and/or position is not matching expected values, indicating a control circuit, actuator, sensor, or mechanical restriction issue.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P0404
ISUZU
P — Powertrain
Exhaust Gas Recirculation Control Circuit Range/Performance
Views:
UK: 27
EN: 55
RU: 50
AI status
Completed
Completed
100%
Causes
- Open/short or high resistance in EGR control wiring or connectors
- Faulty EGR valve, EGR position sensor, or EGR solenoid/actuator
- Clogged carbon buildup in EGR passages or EGR port restricting movement
- Failed EGR position sensor or incorrect feedback signal
- Vacuum supply leak or weak vacuum (vacuum‑operated EGR systems)
- Faulty PCM or EGR driver circuit
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power, hesitation or surging under load
- Rough idle or stalling, especially when warm
- Decreased fuel economy
- Failed emissions test (elevated NOx or other emissions)
- Intermittent drivability complaints depending on operating conditions
What to check
- Scan for P0404 and any related or pending codes; record freeze frame and live data
- Inspect EGR valve/solenoid connectors and wiring for corrosion, breaks, pin damage, or poor fit
- Backprobe EGR control and feedback pins to verify voltage, ground, and duty signals with a scope or DVOM
- Check EGR valve movement (vacuum or electric) while commanding EGR open/closed from a scan tool
- Inspect and clean EGR passages, ports, and intake for carbon blocking
- Verify vacuum supply and check for leaks on vacuum‑operated EGR systems
Signal parameters
- Command signal: PWM duty cycle 0–100% when commanded by PCM (varies with load and speed)
- Control voltage: 0–12 V for many solenoids (check vehicle specifics); feedback sensor typically 0–5 V
- EGR position sensor feedback: usually 0.5–4.5 V range proportional to position
- At idle with EGR closed: command low duty/voltage and feedback near closed position; when commanded open, feedback should change noticeably
- Resistance of typical EGR solenoid: often tens to hundreds of ohms (refer to OEM spec)
Diagnostic algorithm
- Retrieve DTCs and freeze frame. Note engine conditions when fault set (temp, load, RPM).
- Visually inspect EGR valve/solenoid, harness, and connector for damage, corrosion, or loose pins.
- With a scan tool, monitor EGR command (duty/voltage) and EGR feedback/position while commanding EGR on/off. Confirm feedback changes appropriately.
- Backprobe the connector and verify power and ground are present at the component with ignition on and engine off as specified.
- Measure solenoid/actuator resistance; compare to spec. If out of range, replace the component.
- Operate the EGR valve manually (apply vacuum or test voltage) to confirm movement and verify flow to intake. If stuck, remove and clean port/valve or replace if mechanically failed.
- Inspect and clean EGR passages and intake ports of carbon deposits that could prevent correct operation.
- If wiring is suspected, perform wiggle tests, continuity and voltage drop tests, and repair any damaged wiring or connectors.
- If control signal from PCM is absent or incorrect but wiring to component is good, consider PCM driver failure — confirm with scope or known‑good module before replacing.
- Clear codes and perform test drive to confirm repair; recheck for recurrence and related codes.
Likely causes
- Corroded or damaged connector/pin at EGR valve/solenoid
- Stuck or mechanically seized EGR valve due to carbon deposits
- Failed EGR solenoid/actuator that does not respond to command
- Broken or shorted harness between PCM and EGR component
- Bad EGR position sensor producing out‑of‑range feedback
Fault status
Status
PCM detected EGR A control or feedback signal out of expected range/performance. EGR command and/or position is not matching expected values, indicating a control circuit, actuator, sensor, or mechanical restriction issue.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P0404
LAND ROVER
P — Powertrain
Exhaust gas recirculation control - circuit range/ performance
Views:
UK: 18
EN: 38
RU: 36
AI status
Completed
Completed
100%
Causes
- Open/short or high resistance in EGR control wiring or connectors
- Faulty EGR valve, EGR position sensor, or EGR solenoid/actuator
- Clogged carbon buildup in EGR passages or EGR port restricting movement
- Failed EGR position sensor or incorrect feedback signal
- Vacuum supply leak or weak vacuum (vacuum‑operated EGR systems)
- Faulty PCM or EGR driver circuit
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power, hesitation or surging under load
- Rough idle or stalling, especially when warm
- Decreased fuel economy
- Failed emissions test (elevated NOx or other emissions)
- Intermittent drivability complaints depending on operating conditions
What to check
- Scan for P0404 and any related or pending codes; record freeze frame and live data
- Inspect EGR valve/solenoid connectors and wiring for corrosion, breaks, pin damage, or poor fit
- Backprobe EGR control and feedback pins to verify voltage, ground, and duty signals with a scope or DVOM
- Check EGR valve movement (vacuum or electric) while commanding EGR open/closed from a scan tool
- Inspect and clean EGR passages, ports, and intake for carbon blocking
- Verify vacuum supply and check for leaks on vacuum‑operated EGR systems
Signal parameters
- Command signal: PWM duty cycle 0–100% when commanded by PCM (varies with load and speed)
- Control voltage: 0–12 V for many solenoids (check vehicle specifics); feedback sensor typically 0–5 V
- EGR position sensor feedback: usually 0.5–4.5 V range proportional to position
- At idle with EGR closed: command low duty/voltage and feedback near closed position; when commanded open, feedback should change noticeably
- Resistance of typical EGR solenoid: often tens to hundreds of ohms (refer to OEM spec)
Diagnostic algorithm
- Retrieve DTCs and freeze frame. Note engine conditions when fault set (temp, load, RPM).
- Visually inspect EGR valve/solenoid, harness, and connector for damage, corrosion, or loose pins.
- With a scan tool, monitor EGR command (duty/voltage) and EGR feedback/position while commanding EGR on/off. Confirm feedback changes appropriately.
- Backprobe the connector and verify power and ground are present at the component with ignition on and engine off as specified.
- Measure solenoid/actuator resistance; compare to spec. If out of range, replace the component.
- Operate the EGR valve manually (apply vacuum or test voltage) to confirm movement and verify flow to intake. If stuck, remove and clean port/valve or replace if mechanically failed.
- Inspect and clean EGR passages and intake ports of carbon deposits that could prevent correct operation.
- If wiring is suspected, perform wiggle tests, continuity and voltage drop tests, and repair any damaged wiring or connectors.
- If control signal from PCM is absent or incorrect but wiring to component is good, consider PCM driver failure — confirm with scope or known‑good module before replacing.
- Clear codes and perform test drive to confirm repair; recheck for recurrence and related codes.
Likely causes
- Corroded or damaged connector/pin at EGR valve/solenoid
- Stuck or mechanically seized EGR valve due to carbon deposits
- Failed EGR solenoid/actuator that does not respond to command
- Broken or shorted harness between PCM and EGR component
- Bad EGR position sensor producing out‑of‑range feedback
Fault status
Status
PCM detected EGR A control or feedback signal out of expected range/performance. EGR command and/or position is not matching expected values, indicating a control circuit, actuator, sensor, or mechanical restriction issue.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P0404
MITSUBISHI
P — Powertrain
EGR control valve stuck
Views:
UK: 28
EN: 48
RU: 51
AI status
Completed
Completed
100%
Causes
- Open/short or high resistance in EGR control wiring or connectors
- Faulty EGR valve, EGR position sensor, or EGR solenoid/actuator
- Clogged carbon buildup in EGR passages or EGR port restricting movement
- Failed EGR position sensor or incorrect feedback signal
- Vacuum supply leak or weak vacuum (vacuum‑operated EGR systems)
- Faulty PCM or EGR driver circuit
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power, hesitation or surging under load
- Rough idle or stalling, especially when warm
- Decreased fuel economy
- Failed emissions test (elevated NOx or other emissions)
- Intermittent drivability complaints depending on operating conditions
What to check
- Scan for P0404 and any related or pending codes; record freeze frame and live data
- Inspect EGR valve/solenoid connectors and wiring for corrosion, breaks, pin damage, or poor fit
- Backprobe EGR control and feedback pins to verify voltage, ground, and duty signals with a scope or DVOM
- Check EGR valve movement (vacuum or electric) while commanding EGR open/closed from a scan tool
- Inspect and clean EGR passages, ports, and intake for carbon blocking
- Verify vacuum supply and check for leaks on vacuum‑operated EGR systems
Signal parameters
- Command signal: PWM duty cycle 0–100% when commanded by PCM (varies with load and speed)
- Control voltage: 0–12 V for many solenoids (check vehicle specifics); feedback sensor typically 0–5 V
- EGR position sensor feedback: usually 0.5–4.5 V range proportional to position
- At idle with EGR closed: command low duty/voltage and feedback near closed position; when commanded open, feedback should change noticeably
- Resistance of typical EGR solenoid: often tens to hundreds of ohms (refer to OEM spec)
Diagnostic algorithm
- Retrieve DTCs and freeze frame. Note engine conditions when fault set (temp, load, RPM).
- Visually inspect EGR valve/solenoid, harness, and connector for damage, corrosion, or loose pins.
- With a scan tool, monitor EGR command (duty/voltage) and EGR feedback/position while commanding EGR on/off. Confirm feedback changes appropriately.
- Backprobe the connector and verify power and ground are present at the component with ignition on and engine off as specified.
- Measure solenoid/actuator resistance; compare to spec. If out of range, replace the component.
- Operate the EGR valve manually (apply vacuum or test voltage) to confirm movement and verify flow to intake. If stuck, remove and clean port/valve or replace if mechanically failed.
- Inspect and clean EGR passages and intake ports of carbon deposits that could prevent correct operation.
- If wiring is suspected, perform wiggle tests, continuity and voltage drop tests, and repair any damaged wiring or connectors.
- If control signal from PCM is absent or incorrect but wiring to component is good, consider PCM driver failure — confirm with scope or known‑good module before replacing.
- Clear codes and perform test drive to confirm repair; recheck for recurrence and related codes.
Likely causes
- Corroded or damaged connector/pin at EGR valve/solenoid
- Stuck or mechanically seized EGR valve due to carbon deposits
- Failed EGR solenoid/actuator that does not respond to command
- Broken or shorted harness between PCM and EGR component
- Bad EGR position sensor producing out‑of‑range feedback
Fault status
Status
PCM detected EGR A control or feedback signal out of expected range/performance. EGR command and/or position is not matching expected values, indicating a control circuit, actuator, sensor, or mechanical restriction issue.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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