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Home / DTC / P1478 — EXH GAS RCYL SOL FLT (OPEN)

P1478 — EXH GAS RCYL SOL FLT (OPEN)

Detailed page for trouble code P1478.

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Code

P1478

DAEWOO P — Powertrain

EXH GAS RCYL SOL FLT (OPEN)

Brand: DAEWOO
Type: P — Powertrain
Views: UK: 2 EN: 6 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in the EGR solenoid control circuit
  • Disconnected, corroded or damaged connector at the EGR solenoid
  • Failed EGR solenoid (internal open coil)
  • Blown fuse or loss of power/ground to the circuit
  • Faulty ECM driver/output for the EGR solenoid

Symptoms

  • Malfunction indicator lamp (MIL/Check Engine) illuminated
  • Rough idle or hesitation
  • Reduced drivability or transient stumble under load
  • Possible increased NOx emissions / failed emissions test
  • Engine ping or knock under certain conditions
  • Possible poor fuel economy

What to check

  • Read/record freeze frame and full scan-tool data for related codes and EGR command status.
  • Visually inspect EGR solenoid connector and wiring for corrosion, damage, or disconnection.
  • Check relevant fuses and ground points for continuity and good connection.
  • Backprobe connector with key ON and measure supply voltage to the solenoid (reference circuit) and ground.
  • Measure EGR solenoid coil resistance with the connector disconnected; compare to specification.
  • Command EGR solenoid ON via scan tool while monitoring voltage/ground at connector; confirm ECM is commanding.

Signal parameters

  • Coil resistance: typically in the low tens of ohms (example ~10–40 Ω) — consult factory spec for exact value
  • Supply voltage (key ON): ~12 V present at reference/power terminal (if circuit is power-fed)
  • Control signal: usually a ground-side switch or PWM from ECM when commanded (duty varies 0–100%)
  • When commanded ON: measured voltage across coil should show applied supply and a switching/ground reference or a change in continuity
  • No continuity (infinite Ω) across coil = open circuit

Diagnostic algorithm

  1. Retrieve trouble code(s) and freeze-frame data; note conditions when P1478 set.
  2. Perform a visual inspection of EGR solenoid, connector, and harness. Repair any obvious damage.
  3. Check fuses and battery/ignition power to the circuit and verify good ground at chassis/engine ground points.
  4. Disconnect EGR solenoid connector and measure coil resistance with a multimeter. If infinite/open, replace solenoid.
  5. With connector back-probed, key ON (engine OFF) verify reference/power voltage present at power terminal (if applicable).
  6. Use scan tool to command EGR solenoid ON while observing control terminal: expect a switched ground or PWM signal. If no command signal, suspect ECM or wiring between ECM and connector.
  7. If ECM commands but solenoid shows no response and coil has proper resistance, check for voltage drop or poor ground; bench-test solenoid by applying fused 12 V to confirm operation.
  8. If wiring is open or shorted, repair/replace harness and connectors. If solenoid is confirmed bad, replace solenoid.
  9. After repairs, clear codes, perform functional tests and road test to confirm issue is resolved and code does not return.
  10. If all wiring and solenoid check out and ECM output is absent or faulty, follow factory ECM diagnostic procedures before replacement.

Likely causes

  • Broken or disconnected connector/harness to EGR solenoid
  • Open coil inside the EGR solenoid (component failure)
  • Wire chafing or break between ECM and solenoid
  • Blown fuse or poor ground
  • ECM output driver failure (least common)

Fault status

⚠️ Status
Open circuit detected in exhaust gas recirculation (EGR) solenoid control. ECM logged a circuit open fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0401 P0402 P0404 P0405 P0445
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Code

P1478

DODGE P — Powertrain

Battery Temp Sensor Voltage Out Of Limit

Brand: DODGE
Type: P — Powertrain
Views: UK: 14 EN: 21 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in the EGR solenoid control circuit
  • Disconnected, corroded or damaged connector at the EGR solenoid
  • Failed EGR solenoid (internal open coil)
  • Blown fuse or loss of power/ground to the circuit
  • Faulty ECM driver/output for the EGR solenoid

Symptoms

  • Malfunction indicator lamp (MIL/Check Engine) illuminated
  • Rough idle or hesitation
  • Reduced drivability or transient stumble under load
  • Possible increased NOx emissions / failed emissions test
  • Engine ping or knock under certain conditions
  • Possible poor fuel economy

What to check

  • Read/record freeze frame and full scan-tool data for related codes and EGR command status.
  • Visually inspect EGR solenoid connector and wiring for corrosion, damage, or disconnection.
  • Check relevant fuses and ground points for continuity and good connection.
  • Backprobe connector with key ON and measure supply voltage to the solenoid (reference circuit) and ground.
  • Measure EGR solenoid coil resistance with the connector disconnected; compare to specification.
  • Command EGR solenoid ON via scan tool while monitoring voltage/ground at connector; confirm ECM is commanding.

Signal parameters

  • Coil resistance: typically in the low tens of ohms (example ~10–40 Ω) — consult factory spec for exact value
  • Supply voltage (key ON): ~12 V present at reference/power terminal (if circuit is power-fed)
  • Control signal: usually a ground-side switch or PWM from ECM when commanded (duty varies 0–100%)
  • When commanded ON: measured voltage across coil should show applied supply and a switching/ground reference or a change in continuity
  • No continuity (infinite Ω) across coil = open circuit

Diagnostic algorithm

  1. Retrieve trouble code(s) and freeze-frame data; note conditions when P1478 set.
  2. Perform a visual inspection of EGR solenoid, connector, and harness. Repair any obvious damage.
  3. Check fuses and battery/ignition power to the circuit and verify good ground at chassis/engine ground points.
  4. Disconnect EGR solenoid connector and measure coil resistance with a multimeter. If infinite/open, replace solenoid.
  5. With connector back-probed, key ON (engine OFF) verify reference/power voltage present at power terminal (if applicable).
  6. Use scan tool to command EGR solenoid ON while observing control terminal: expect a switched ground or PWM signal. If no command signal, suspect ECM or wiring between ECM and connector.
  7. If ECM commands but solenoid shows no response and coil has proper resistance, check for voltage drop or poor ground; bench-test solenoid by applying fused 12 V to confirm operation.
  8. If wiring is open or shorted, repair/replace harness and connectors. If solenoid is confirmed bad, replace solenoid.
  9. After repairs, clear codes, perform functional tests and road test to confirm issue is resolved and code does not return.
  10. If all wiring and solenoid check out and ECM output is absent or faulty, follow factory ECM diagnostic procedures before replacement.

Likely causes

  • Broken or disconnected connector/harness to EGR solenoid
  • Open coil inside the EGR solenoid (component failure)
  • Wire chafing or break between ECM and solenoid
  • Blown fuse or poor ground
  • ECM output driver failure (least common)

Fault status

⚠️ Status
Open circuit detected in exhaust gas recirculation (EGR) solenoid control. ECM logged a circuit open fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0401 P0402 P0404 P0405 P0445
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1478

JEEP P — Powertrain

Battery Temp Sensor Voltage Out Of Limit

Brand: JEEP
Type: P — Powertrain
Views: UK: 19 EN: 17 RU: 20
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in the EGR solenoid control circuit
  • Disconnected, corroded or damaged connector at the EGR solenoid
  • Failed EGR solenoid (internal open coil)
  • Blown fuse or loss of power/ground to the circuit
  • Faulty ECM driver/output for the EGR solenoid

Symptoms

  • Malfunction indicator lamp (MIL/Check Engine) illuminated
  • Rough idle or hesitation
  • Reduced drivability or transient stumble under load
  • Possible increased NOx emissions / failed emissions test
  • Engine ping or knock under certain conditions
  • Possible poor fuel economy

What to check

  • Read/record freeze frame and full scan-tool data for related codes and EGR command status.
  • Visually inspect EGR solenoid connector and wiring for corrosion, damage, or disconnection.
  • Check relevant fuses and ground points for continuity and good connection.
  • Backprobe connector with key ON and measure supply voltage to the solenoid (reference circuit) and ground.
  • Measure EGR solenoid coil resistance with the connector disconnected; compare to specification.
  • Command EGR solenoid ON via scan tool while monitoring voltage/ground at connector; confirm ECM is commanding.

Signal parameters

  • Coil resistance: typically in the low tens of ohms (example ~10–40 Ω) — consult factory spec for exact value
  • Supply voltage (key ON): ~12 V present at reference/power terminal (if circuit is power-fed)
  • Control signal: usually a ground-side switch or PWM from ECM when commanded (duty varies 0–100%)
  • When commanded ON: measured voltage across coil should show applied supply and a switching/ground reference or a change in continuity
  • No continuity (infinite Ω) across coil = open circuit

Diagnostic algorithm

  1. Retrieve trouble code(s) and freeze-frame data; note conditions when P1478 set.
  2. Perform a visual inspection of EGR solenoid, connector, and harness. Repair any obvious damage.
  3. Check fuses and battery/ignition power to the circuit and verify good ground at chassis/engine ground points.
  4. Disconnect EGR solenoid connector and measure coil resistance with a multimeter. If infinite/open, replace solenoid.
  5. With connector back-probed, key ON (engine OFF) verify reference/power voltage present at power terminal (if applicable).
  6. Use scan tool to command EGR solenoid ON while observing control terminal: expect a switched ground or PWM signal. If no command signal, suspect ECM or wiring between ECM and connector.
  7. If ECM commands but solenoid shows no response and coil has proper resistance, check for voltage drop or poor ground; bench-test solenoid by applying fused 12 V to confirm operation.
  8. If wiring is open or shorted, repair/replace harness and connectors. If solenoid is confirmed bad, replace solenoid.
  9. After repairs, clear codes, perform functional tests and road test to confirm issue is resolved and code does not return.
  10. If all wiring and solenoid check out and ECM output is absent or faulty, follow factory ECM diagnostic procedures before replacement.

Likely causes

  • Broken or disconnected connector/harness to EGR solenoid
  • Open coil inside the EGR solenoid (component failure)
  • Wire chafing or break between ECM and solenoid
  • Blown fuse or poor ground
  • ECM output driver failure (least common)

Fault status

⚠️ Status
Open circuit detected in exhaust gas recirculation (EGR) solenoid control. ECM logged a circuit open fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0401 P0402 P0404 P0405 P0445
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1478

Other P — Powertrain

Cooling Fan Driver Fault

Brand: Other
Type: P — Powertrain
Views: UK: 18 EN: 22 RU: 23
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in the EGR solenoid control circuit
  • Disconnected, corroded or damaged connector at the EGR solenoid
  • Failed EGR solenoid (internal open coil)
  • Blown fuse or loss of power/ground to the circuit
  • Faulty ECM driver/output for the EGR solenoid

Symptoms

  • Malfunction indicator lamp (MIL/Check Engine) illuminated
  • Rough idle or hesitation
  • Reduced drivability or transient stumble under load
  • Possible increased NOx emissions / failed emissions test
  • Engine ping or knock under certain conditions
  • Possible poor fuel economy

What to check

  • Read/record freeze frame and full scan-tool data for related codes and EGR command status.
  • Visually inspect EGR solenoid connector and wiring for corrosion, damage, or disconnection.
  • Check relevant fuses and ground points for continuity and good connection.
  • Backprobe connector with key ON and measure supply voltage to the solenoid (reference circuit) and ground.
  • Measure EGR solenoid coil resistance with the connector disconnected; compare to specification.
  • Command EGR solenoid ON via scan tool while monitoring voltage/ground at connector; confirm ECM is commanding.

Signal parameters

  • Coil resistance: typically in the low tens of ohms (example ~10–40 Ω) — consult factory spec for exact value
  • Supply voltage (key ON): ~12 V present at reference/power terminal (if circuit is power-fed)
  • Control signal: usually a ground-side switch or PWM from ECM when commanded (duty varies 0–100%)
  • When commanded ON: measured voltage across coil should show applied supply and a switching/ground reference or a change in continuity
  • No continuity (infinite Ω) across coil = open circuit

Diagnostic algorithm

  1. Retrieve trouble code(s) and freeze-frame data; note conditions when P1478 set.
  2. Perform a visual inspection of EGR solenoid, connector, and harness. Repair any obvious damage.
  3. Check fuses and battery/ignition power to the circuit and verify good ground at chassis/engine ground points.
  4. Disconnect EGR solenoid connector and measure coil resistance with a multimeter. If infinite/open, replace solenoid.
  5. With connector back-probed, key ON (engine OFF) verify reference/power voltage present at power terminal (if applicable).
  6. Use scan tool to command EGR solenoid ON while observing control terminal: expect a switched ground or PWM signal. If no command signal, suspect ECM or wiring between ECM and connector.
  7. If ECM commands but solenoid shows no response and coil has proper resistance, check for voltage drop or poor ground; bench-test solenoid by applying fused 12 V to confirm operation.
  8. If wiring is open or shorted, repair/replace harness and connectors. If solenoid is confirmed bad, replace solenoid.
  9. After repairs, clear codes, perform functional tests and road test to confirm issue is resolved and code does not return.
  10. If all wiring and solenoid check out and ECM output is absent or faulty, follow factory ECM diagnostic procedures before replacement.

Likely causes

  • Broken or disconnected connector/harness to EGR solenoid
  • Open coil inside the EGR solenoid (component failure)
  • Wire chafing or break between ECM and solenoid
  • Blown fuse or poor ground
  • ECM output driver failure (least common)

Fault status

⚠️ Status
Open circuit detected in exhaust gas recirculation (EGR) solenoid control. ECM logged a circuit open fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0401 P0402 P0404 P0405 P0445
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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
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Code

P1478

RAM P — Powertrain

Battery Temp Sensor Volts out of limit

Brand: RAM
Type: P — Powertrain
Views: UK: 4 EN: 6 RU: 6
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in the EGR solenoid control circuit
  • Disconnected, corroded or damaged connector at the EGR solenoid
  • Failed EGR solenoid (internal open coil)
  • Blown fuse or loss of power/ground to the circuit
  • Faulty ECM driver/output for the EGR solenoid

Symptoms

  • Malfunction indicator lamp (MIL/Check Engine) illuminated
  • Rough idle or hesitation
  • Reduced drivability or transient stumble under load
  • Possible increased NOx emissions / failed emissions test
  • Engine ping or knock under certain conditions
  • Possible poor fuel economy

What to check

  • Read/record freeze frame and full scan-tool data for related codes and EGR command status.
  • Visually inspect EGR solenoid connector and wiring for corrosion, damage, or disconnection.
  • Check relevant fuses and ground points for continuity and good connection.
  • Backprobe connector with key ON and measure supply voltage to the solenoid (reference circuit) and ground.
  • Measure EGR solenoid coil resistance with the connector disconnected; compare to specification.
  • Command EGR solenoid ON via scan tool while monitoring voltage/ground at connector; confirm ECM is commanding.

Signal parameters

  • Coil resistance: typically in the low tens of ohms (example ~10–40 Ω) — consult factory spec for exact value
  • Supply voltage (key ON): ~12 V present at reference/power terminal (if circuit is power-fed)
  • Control signal: usually a ground-side switch or PWM from ECM when commanded (duty varies 0–100%)
  • When commanded ON: measured voltage across coil should show applied supply and a switching/ground reference or a change in continuity
  • No continuity (infinite Ω) across coil = open circuit

Diagnostic algorithm

  1. Retrieve trouble code(s) and freeze-frame data; note conditions when P1478 set.
  2. Perform a visual inspection of EGR solenoid, connector, and harness. Repair any obvious damage.
  3. Check fuses and battery/ignition power to the circuit and verify good ground at chassis/engine ground points.
  4. Disconnect EGR solenoid connector and measure coil resistance with a multimeter. If infinite/open, replace solenoid.
  5. With connector back-probed, key ON (engine OFF) verify reference/power voltage present at power terminal (if applicable).
  6. Use scan tool to command EGR solenoid ON while observing control terminal: expect a switched ground or PWM signal. If no command signal, suspect ECM or wiring between ECM and connector.
  7. If ECM commands but solenoid shows no response and coil has proper resistance, check for voltage drop or poor ground; bench-test solenoid by applying fused 12 V to confirm operation.
  8. If wiring is open or shorted, repair/replace harness and connectors. If solenoid is confirmed bad, replace solenoid.
  9. After repairs, clear codes, perform functional tests and road test to confirm issue is resolved and code does not return.
  10. If all wiring and solenoid check out and ECM output is absent or faulty, follow factory ECM diagnostic procedures before replacement.

Likely causes

  • Broken or disconnected connector/harness to EGR solenoid
  • Open coil inside the EGR solenoid (component failure)
  • Wire chafing or break between ECM and solenoid
  • Blown fuse or poor ground
  • ECM output driver failure (least common)

Fault status

⚠️ Status
Open circuit detected in exhaust gas recirculation (EGR) solenoid control. ECM logged a circuit open fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0401 P0402 P0404 P0405 P0445
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Code

P1478

VOLKSWAGEN P — Powertrain

EVAP Emission Control System LDP Clamped Tube Detected

Brand: VOLKSWAGEN
Type: P — Powertrain
Views: UK: 14 EN: 15 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or broken wiring in the EGR solenoid control circuit
  • Disconnected, corroded or damaged connector at the EGR solenoid
  • Failed EGR solenoid (internal open coil)
  • Blown fuse or loss of power/ground to the circuit
  • Faulty ECM driver/output for the EGR solenoid

Symptoms

  • Malfunction indicator lamp (MIL/Check Engine) illuminated
  • Rough idle or hesitation
  • Reduced drivability or transient stumble under load
  • Possible increased NOx emissions / failed emissions test
  • Engine ping or knock under certain conditions
  • Possible poor fuel economy

What to check

  • Read/record freeze frame and full scan-tool data for related codes and EGR command status.
  • Visually inspect EGR solenoid connector and wiring for corrosion, damage, or disconnection.
  • Check relevant fuses and ground points for continuity and good connection.
  • Backprobe connector with key ON and measure supply voltage to the solenoid (reference circuit) and ground.
  • Measure EGR solenoid coil resistance with the connector disconnected; compare to specification.
  • Command EGR solenoid ON via scan tool while monitoring voltage/ground at connector; confirm ECM is commanding.

Signal parameters

  • Coil resistance: typically in the low tens of ohms (example ~10–40 Ω) — consult factory spec for exact value
  • Supply voltage (key ON): ~12 V present at reference/power terminal (if circuit is power-fed)
  • Control signal: usually a ground-side switch or PWM from ECM when commanded (duty varies 0–100%)
  • When commanded ON: measured voltage across coil should show applied supply and a switching/ground reference or a change in continuity
  • No continuity (infinite Ω) across coil = open circuit

Diagnostic algorithm

  1. Retrieve trouble code(s) and freeze-frame data; note conditions when P1478 set.
  2. Perform a visual inspection of EGR solenoid, connector, and harness. Repair any obvious damage.
  3. Check fuses and battery/ignition power to the circuit and verify good ground at chassis/engine ground points.
  4. Disconnect EGR solenoid connector and measure coil resistance with a multimeter. If infinite/open, replace solenoid.
  5. With connector back-probed, key ON (engine OFF) verify reference/power voltage present at power terminal (if applicable).
  6. Use scan tool to command EGR solenoid ON while observing control terminal: expect a switched ground or PWM signal. If no command signal, suspect ECM or wiring between ECM and connector.
  7. If ECM commands but solenoid shows no response and coil has proper resistance, check for voltage drop or poor ground; bench-test solenoid by applying fused 12 V to confirm operation.
  8. If wiring is open or shorted, repair/replace harness and connectors. If solenoid is confirmed bad, replace solenoid.
  9. After repairs, clear codes, perform functional tests and road test to confirm issue is resolved and code does not return.
  10. If all wiring and solenoid check out and ECM output is absent or faulty, follow factory ECM diagnostic procedures before replacement.

Likely causes

  • Broken or disconnected connector/harness to EGR solenoid
  • Open coil inside the EGR solenoid (component failure)
  • Wire chafing or break between ECM and solenoid
  • Blown fuse or poor ground
  • ECM output driver failure (least common)

Fault status

⚠️ Status
Open circuit detected in exhaust gas recirculation (EGR) solenoid control. ECM logged a circuit open fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0401 P0402 P0404 P0405 P0445
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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