Code
P0447
Generic
P — Powertrain
EVAP System Vent Control Circuit Open
Views:
UK: 29
EN: 56
RU: 60
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the vent valve harness
- Disconnected, corroded, or damaged connector at vent valve
- Failed EVAP vent control valve (solenoid)
- Blown fuse or inline power feed open
- Poor or missing ground connection
- Aftermarket work or mechanical damage to harness
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed EVAP monitor or vehicle may not complete EVAP readiness
- Possible difficulty passing emissions test
- Usually no change in drivability; fuel odor not common but possible
- Check engine light may be steady
What to check
- Scan for additional EVAP or related codes and view freeze frame data
- Visual inspection of vent valve, connector, and wiring harness for damage or corrosion
- Backprobe vent valve connector to check for supply voltage and control signal
- Measure vent valve coil resistance with connector disconnected
- Check continuity between vent valve connector and PCM pin
- Verify relevant fuses and relays are intact
Signal parameters
- Nominal vehicle battery supply at power pin: ~12 V (with key ON)
- Control pin: typically switched by PCM (ground-side or voltage-side depending on vehicle)
- Vent solenoid coil resistance (typical range): roughly 10–100 Ω (varies by design) — open circuit indicates >>1 kΩ or infinite
- Continuity from valve connector to PCM control pin: near 0 Ω (typically
- Voltage drop on supply or ground under load should be minimal (
Diagnostic algorithm
- Connect an OBD-II scanner, confirm P0447 and note any related codes and freeze frame.
- Visually inspect EVAP vent valve, connector, and wiring for corrosion, breaks, pins pushed out, or recent service damage.
- Identify vent valve connector pins (power, control, ground). With key ON (engine off) measure battery voltage at the power pin; verify ground continuity to chassis ground.
- With connector disconnected, measure coil resistance across the valve pins. If infinite/open, replace the vent valve.
- Backprobe the control pin at the valve connector, command the vent valve ON with a scan tool and observe the control signal (voltage change or ground switching). If no control signal, check continuity from connector to PCM.
- Perform continuity test between the valve control pin and the PCM control pin. Repair open wiring or connectors if continuity is not present.
- Check relevant fuses and relays supplying the EVAP circuit and replace as needed.
- After repairs, clear codes and perform drive/EVAP readiness cycle to confirm the fault does not return.
- If wiring, connectors, valve, and fuses are good but P0447 persists, consider PCM output driver fault and consult manufacturer-specific diagnostics before replacing the PCM.
Likely causes
- Worn/chafed wire between PCM and vent valve resulting in open circuit
- Corroded or pushed-out connector at vent valve
- Failed vent solenoid coil (open winding)
- Blown fuse that supplies vent valve or PCM control circuit
- Loose or corroded ground at chassis or engine ground point
- Connector pins pushed out or bent inside the plug
Fault status
Status
Diagnostic Trouble Code P0447 — EVAP System Vent Control Circuit Open. The PCM detected an open or missing signal in the EVAP vent control circuit (open wiring, connector, or failed vent control valve).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0447
GWM
P — Powertrain
- The ventilation circuit for the fuel vapor outlet control system is open
Views:
UK: 20
EN: 25
RU: 28
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the vent valve harness
- Disconnected, corroded, or damaged connector at vent valve
- Failed EVAP vent control valve (solenoid)
- Blown fuse or inline power feed open
- Poor or missing ground connection
- Aftermarket work or mechanical damage to harness
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed EVAP monitor or vehicle may not complete EVAP readiness
- Possible difficulty passing emissions test
- Usually no change in drivability; fuel odor not common but possible
- Check engine light may be steady
What to check
- Scan for additional EVAP or related codes and view freeze frame data
- Visual inspection of vent valve, connector, and wiring harness for damage or corrosion
- Backprobe vent valve connector to check for supply voltage and control signal
- Measure vent valve coil resistance with connector disconnected
- Check continuity between vent valve connector and PCM pin
- Verify relevant fuses and relays are intact
Signal parameters
- Nominal vehicle battery supply at power pin: ~12 V (with key ON)
- Control pin: typically switched by PCM (ground-side or voltage-side depending on vehicle)
- Vent solenoid coil resistance (typical range): roughly 10–100 Ω (varies by design) — open circuit indicates >>1 kΩ or infinite
- Continuity from valve connector to PCM control pin: near 0 Ω (typically
- Voltage drop on supply or ground under load should be minimal (
Diagnostic algorithm
- Connect an OBD-II scanner, confirm P0447 and note any related codes and freeze frame.
- Visually inspect EVAP vent valve, connector, and wiring for corrosion, breaks, pins pushed out, or recent service damage.
- Identify vent valve connector pins (power, control, ground). With key ON (engine off) measure battery voltage at the power pin; verify ground continuity to chassis ground.
- With connector disconnected, measure coil resistance across the valve pins. If infinite/open, replace the vent valve.
- Backprobe the control pin at the valve connector, command the vent valve ON with a scan tool and observe the control signal (voltage change or ground switching). If no control signal, check continuity from connector to PCM.
- Perform continuity test between the valve control pin and the PCM control pin. Repair open wiring or connectors if continuity is not present.
- Check relevant fuses and relays supplying the EVAP circuit and replace as needed.
- After repairs, clear codes and perform drive/EVAP readiness cycle to confirm the fault does not return.
- If wiring, connectors, valve, and fuses are good but P0447 persists, consider PCM output driver fault and consult manufacturer-specific diagnostics before replacing the PCM.
Likely causes
- Worn/chafed wire between PCM and vent valve resulting in open circuit
- Corroded or pushed-out connector at vent valve
- Failed vent solenoid coil (open winding)
- Blown fuse that supplies vent valve or PCM control circuit
- Loose or corroded ground at chassis or engine ground point
- Connector pins pushed out or bent inside the plug
Fault status
Status
Diagnostic Trouble Code P0447 — EVAP System Vent Control Circuit Open. The PCM detected an open or missing signal in the EVAP vent control circuit (open wiring, connector, or failed vent control valve).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0447
HUMMER
P — Powertrain
Evaporative Emission Control System Vent Control Circuit Open
Views:
UK: 20
EN: 34
RU: 42
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the vent valve harness
- Disconnected, corroded, or damaged connector at vent valve
- Failed EVAP vent control valve (solenoid)
- Blown fuse or inline power feed open
- Poor or missing ground connection
- Aftermarket work or mechanical damage to harness
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed EVAP monitor or vehicle may not complete EVAP readiness
- Possible difficulty passing emissions test
- Usually no change in drivability; fuel odor not common but possible
- Check engine light may be steady
What to check
- Scan for additional EVAP or related codes and view freeze frame data
- Visual inspection of vent valve, connector, and wiring harness for damage or corrosion
- Backprobe vent valve connector to check for supply voltage and control signal
- Measure vent valve coil resistance with connector disconnected
- Check continuity between vent valve connector and PCM pin
- Verify relevant fuses and relays are intact
Signal parameters
- Nominal vehicle battery supply at power pin: ~12 V (with key ON)
- Control pin: typically switched by PCM (ground-side or voltage-side depending on vehicle)
- Vent solenoid coil resistance (typical range): roughly 10–100 Ω (varies by design) — open circuit indicates >>1 kΩ or infinite
- Continuity from valve connector to PCM control pin: near 0 Ω (typically
- Voltage drop on supply or ground under load should be minimal (
Diagnostic algorithm
- Connect an OBD-II scanner, confirm P0447 and note any related codes and freeze frame.
- Visually inspect EVAP vent valve, connector, and wiring for corrosion, breaks, pins pushed out, or recent service damage.
- Identify vent valve connector pins (power, control, ground). With key ON (engine off) measure battery voltage at the power pin; verify ground continuity to chassis ground.
- With connector disconnected, measure coil resistance across the valve pins. If infinite/open, replace the vent valve.
- Backprobe the control pin at the valve connector, command the vent valve ON with a scan tool and observe the control signal (voltage change or ground switching). If no control signal, check continuity from connector to PCM.
- Perform continuity test between the valve control pin and the PCM control pin. Repair open wiring or connectors if continuity is not present.
- Check relevant fuses and relays supplying the EVAP circuit and replace as needed.
- After repairs, clear codes and perform drive/EVAP readiness cycle to confirm the fault does not return.
- If wiring, connectors, valve, and fuses are good but P0447 persists, consider PCM output driver fault and consult manufacturer-specific diagnostics before replacing the PCM.
Likely causes
- Worn/chafed wire between PCM and vent valve resulting in open circuit
- Corroded or pushed-out connector at vent valve
- Failed vent solenoid coil (open winding)
- Blown fuse that supplies vent valve or PCM control circuit
- Loose or corroded ground at chassis or engine ground point
- Connector pins pushed out or bent inside the plug
Fault status
Status
Diagnostic Trouble Code P0447 — EVAP System Vent Control Circuit Open. The PCM detected an open or missing signal in the EVAP vent control circuit (open wiring, connector, or failed vent control valve).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0447
LAND ROVER
P — Powertrain
Fan control circuit of the emissions control system by open evaporation
Views:
UK: 17
EN: 32
RU: 33
AI status
Completed
Completed
100%
Causes
- Open or broken wiring in the vent valve harness
- Disconnected, corroded, or damaged connector at vent valve
- Failed EVAP vent control valve (solenoid)
- Blown fuse or inline power feed open
- Poor or missing ground connection
- Aftermarket work or mechanical damage to harness
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Failed EVAP monitor or vehicle may not complete EVAP readiness
- Possible difficulty passing emissions test
- Usually no change in drivability; fuel odor not common but possible
- Check engine light may be steady
What to check
- Scan for additional EVAP or related codes and view freeze frame data
- Visual inspection of vent valve, connector, and wiring harness for damage or corrosion
- Backprobe vent valve connector to check for supply voltage and control signal
- Measure vent valve coil resistance with connector disconnected
- Check continuity between vent valve connector and PCM pin
- Verify relevant fuses and relays are intact
Signal parameters
- Nominal vehicle battery supply at power pin: ~12 V (with key ON)
- Control pin: typically switched by PCM (ground-side or voltage-side depending on vehicle)
- Vent solenoid coil resistance (typical range): roughly 10–100 Ω (varies by design) — open circuit indicates >>1 kΩ or infinite
- Continuity from valve connector to PCM control pin: near 0 Ω (typically
- Voltage drop on supply or ground under load should be minimal (
Diagnostic algorithm
- Connect an OBD-II scanner, confirm P0447 and note any related codes and freeze frame.
- Visually inspect EVAP vent valve, connector, and wiring for corrosion, breaks, pins pushed out, or recent service damage.
- Identify vent valve connector pins (power, control, ground). With key ON (engine off) measure battery voltage at the power pin; verify ground continuity to chassis ground.
- With connector disconnected, measure coil resistance across the valve pins. If infinite/open, replace the vent valve.
- Backprobe the control pin at the valve connector, command the vent valve ON with a scan tool and observe the control signal (voltage change or ground switching). If no control signal, check continuity from connector to PCM.
- Perform continuity test between the valve control pin and the PCM control pin. Repair open wiring or connectors if continuity is not present.
- Check relevant fuses and relays supplying the EVAP circuit and replace as needed.
- After repairs, clear codes and perform drive/EVAP readiness cycle to confirm the fault does not return.
- If wiring, connectors, valve, and fuses are good but P0447 persists, consider PCM output driver fault and consult manufacturer-specific diagnostics before replacing the PCM.
Likely causes
- Worn/chafed wire between PCM and vent valve resulting in open circuit
- Corroded or pushed-out connector at vent valve
- Failed vent solenoid coil (open winding)
- Blown fuse that supplies vent valve or PCM control circuit
- Loose or corroded ground at chassis or engine ground point
- Connector pins pushed out or bent inside the plug
Fault status
Status
Diagnostic Trouble Code P0447 — EVAP System Vent Control Circuit Open. The PCM detected an open or missing signal in the EVAP vent control circuit (open wiring, connector, or failed vent control valve).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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