Code
P0445
Generic
P — Powertrain
EVAP System Purge Control Valve A Circuit Shorted
Views:
UK: 26
EN: 42
RU: 40
AI status
Completed
Completed
100%
Causes
- Short to battery (B+) on purge valve control circuit
- Short to ground on purge valve control circuit
- Damaged, chafed, or pinched wiring harness or connector
- Corroded or loose connector pins at the purge valve
- Failed purge control solenoid (internal short)
- Blown fuse or failed driver in PCM/ECM
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Stored P0445 code (may be accompanied by other EVAP codes)
- Possible poor idle or drivability rarely (usually electrical issue only)
- Failed EVAP readiness test and emission test failure
- Possible faint odor of fuel vapor in some cases
What to check
- Read and record all stored codes and freeze-frame data; check for related EVAP codes
- Visual inspection of purge valve, wiring harness, and connector for damage, corrosion, or pinched wires
- Check related fuses and power supplies for the EVAP system
- Backprobe the purge valve connector with key ON (engine OFF) and observe voltages
- Use a scan tool to actuate the purge valve while monitoring circuit voltage
- Measure coil resistance of the purge valve with it disconnected from harness
Signal parameters
- Battery voltage at purge valve supply terminal with key ON (approx. 11.5–14.5 V)
- Control driver voltage: when PCM commands ON, driver should pull to near 0 V (ground) or use PWM; when OFF, driver typically high-impedance, so valve sees battery voltage
- Purge valve coil resistance (typical): approx. 15–72 ohms (varies by vehicle) — consult specific service data
- Short to ground: measured voltage near 0 V at harness connector regardless of command
- Short to battery: measured voltage near battery voltage at PCM control pin when circuit should be pulled low
Diagnostic algorithm
- Retrieve freeze-frame and other EVAP-related codes. Note vehicle conditions when code set.
- Visually inspect purge valve, connector, and wiring along full harness route for damage, chafing, melted insulation, or corrosion.
- With ignition ON (engine OFF), backprobe purge valve connector: verify battery presence at supply terminal and expected voltage at control terminal. Record values.
- Command purge valve ON using a good scan tool while observing control terminal: if driver should ground, voltage should drop near 0 V. If control terminal reads constant battery or constant 0 V regardless of command, suspect short to B+ or short to ground respectively.
- Disconnect the purge valve connector. Measure coil resistance across valve terminals with ohmmeter. Compare to specification. Very low resistance indicates internal short; open or very high indicates open circuit.
- With valve disconnected, check for shorts in harness: measure resistance from control wire to ground (should be high/OL) and to battery (should be high/OL) with key OFF. A low resistance indicates short to ground or B+ in the harness or at PCM.
- If harness checks show low resistance and short location not visible, isolate sections of harness (disconnect at known splice points) to narrow down location, or temporarily disconnect other components on same circuit if present.
- If harness appears good and short persists with harness disconnected from valve, suspect PCM driver fault — verify with manufacturer procedures before replacement.
- Repair or replace damaged wiring, connector, or purge valve as indicated. Replace blown fuses if present and verify PCM driver is not damaged.
- After repairs, clear codes and perform smoke/EVAP system readiness checks and a drive cycle to confirm no recurrence.
Likely causes
- Shorted or melted insulation where harness rubs on chassis or engine components
- Water intrusion/corrosion in purge valve connector causing low-resistance path
- Internal short inside the purge solenoid coil
- Connector pins pushed out, contacting ground or another terminal
- Aftermarket work or previous repairs with bundled/stressed wires
Fault status
Status
P0445 — EVAP purge control valve A circuit shorted. PCM detected an electrical short (to battery or to ground) in the purge valve control circuit. This will typically set the MIL and may prevent normal EVAP purge operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0445
GWM
P — Powertrain
- Short circuit in the fuel vapor eliminator control valve circuit
Views:
UK: 15
EN: 20
RU: 16
AI status
Completed
Completed
100%
Causes
- Short to battery (B+) on purge valve control circuit
- Short to ground on purge valve control circuit
- Damaged, chafed, or pinched wiring harness or connector
- Corroded or loose connector pins at the purge valve
- Failed purge control solenoid (internal short)
- Blown fuse or failed driver in PCM/ECM
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Stored P0445 code (may be accompanied by other EVAP codes)
- Possible poor idle or drivability rarely (usually electrical issue only)
- Failed EVAP readiness test and emission test failure
- Possible faint odor of fuel vapor in some cases
What to check
- Read and record all stored codes and freeze-frame data; check for related EVAP codes
- Visual inspection of purge valve, wiring harness, and connector for damage, corrosion, or pinched wires
- Check related fuses and power supplies for the EVAP system
- Backprobe the purge valve connector with key ON (engine OFF) and observe voltages
- Use a scan tool to actuate the purge valve while monitoring circuit voltage
- Measure coil resistance of the purge valve with it disconnected from harness
Signal parameters
- Battery voltage at purge valve supply terminal with key ON (approx. 11.5–14.5 V)
- Control driver voltage: when PCM commands ON, driver should pull to near 0 V (ground) or use PWM; when OFF, driver typically high-impedance, so valve sees battery voltage
- Purge valve coil resistance (typical): approx. 15–72 ohms (varies by vehicle) — consult specific service data
- Short to ground: measured voltage near 0 V at harness connector regardless of command
- Short to battery: measured voltage near battery voltage at PCM control pin when circuit should be pulled low
Diagnostic algorithm
- Retrieve freeze-frame and other EVAP-related codes. Note vehicle conditions when code set.
- Visually inspect purge valve, connector, and wiring along full harness route for damage, chafing, melted insulation, or corrosion.
- With ignition ON (engine OFF), backprobe purge valve connector: verify battery presence at supply terminal and expected voltage at control terminal. Record values.
- Command purge valve ON using a good scan tool while observing control terminal: if driver should ground, voltage should drop near 0 V. If control terminal reads constant battery or constant 0 V regardless of command, suspect short to B+ or short to ground respectively.
- Disconnect the purge valve connector. Measure coil resistance across valve terminals with ohmmeter. Compare to specification. Very low resistance indicates internal short; open or very high indicates open circuit.
- With valve disconnected, check for shorts in harness: measure resistance from control wire to ground (should be high/OL) and to battery (should be high/OL) with key OFF. A low resistance indicates short to ground or B+ in the harness or at PCM.
- If harness checks show low resistance and short location not visible, isolate sections of harness (disconnect at known splice points) to narrow down location, or temporarily disconnect other components on same circuit if present.
- If harness appears good and short persists with harness disconnected from valve, suspect PCM driver fault — verify with manufacturer procedures before replacement.
- Repair or replace damaged wiring, connector, or purge valve as indicated. Replace blown fuses if present and verify PCM driver is not damaged.
- After repairs, clear codes and perform smoke/EVAP system readiness checks and a drive cycle to confirm no recurrence.
Likely causes
- Shorted or melted insulation where harness rubs on chassis or engine components
- Water intrusion/corrosion in purge valve connector causing low-resistance path
- Internal short inside the purge solenoid coil
- Connector pins pushed out, contacting ground or another terminal
- Aftermarket work or previous repairs with bundled/stressed wires
Fault status
Status
P0445 — EVAP purge control valve A circuit shorted. PCM detected an electrical short (to battery or to ground) in the purge valve control circuit. This will typically set the MIL and may prevent normal EVAP purge operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0445
HUMMER
P — Powertrain
Evaporative Emission Control System Purge Control Valve Circuit Shorted
Views:
UK: 14
EN: 25
RU: 21
AI status
Completed
Completed
100%
Causes
- Short to battery (B+) on purge valve control circuit
- Short to ground on purge valve control circuit
- Damaged, chafed, or pinched wiring harness or connector
- Corroded or loose connector pins at the purge valve
- Failed purge control solenoid (internal short)
- Blown fuse or failed driver in PCM/ECM
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Stored P0445 code (may be accompanied by other EVAP codes)
- Possible poor idle or drivability rarely (usually electrical issue only)
- Failed EVAP readiness test and emission test failure
- Possible faint odor of fuel vapor in some cases
What to check
- Read and record all stored codes and freeze-frame data; check for related EVAP codes
- Visual inspection of purge valve, wiring harness, and connector for damage, corrosion, or pinched wires
- Check related fuses and power supplies for the EVAP system
- Backprobe the purge valve connector with key ON (engine OFF) and observe voltages
- Use a scan tool to actuate the purge valve while monitoring circuit voltage
- Measure coil resistance of the purge valve with it disconnected from harness
Signal parameters
- Battery voltage at purge valve supply terminal with key ON (approx. 11.5–14.5 V)
- Control driver voltage: when PCM commands ON, driver should pull to near 0 V (ground) or use PWM; when OFF, driver typically high-impedance, so valve sees battery voltage
- Purge valve coil resistance (typical): approx. 15–72 ohms (varies by vehicle) — consult specific service data
- Short to ground: measured voltage near 0 V at harness connector regardless of command
- Short to battery: measured voltage near battery voltage at PCM control pin when circuit should be pulled low
Diagnostic algorithm
- Retrieve freeze-frame and other EVAP-related codes. Note vehicle conditions when code set.
- Visually inspect purge valve, connector, and wiring along full harness route for damage, chafing, melted insulation, or corrosion.
- With ignition ON (engine OFF), backprobe purge valve connector: verify battery presence at supply terminal and expected voltage at control terminal. Record values.
- Command purge valve ON using a good scan tool while observing control terminal: if driver should ground, voltage should drop near 0 V. If control terminal reads constant battery or constant 0 V regardless of command, suspect short to B+ or short to ground respectively.
- Disconnect the purge valve connector. Measure coil resistance across valve terminals with ohmmeter. Compare to specification. Very low resistance indicates internal short; open or very high indicates open circuit.
- With valve disconnected, check for shorts in harness: measure resistance from control wire to ground (should be high/OL) and to battery (should be high/OL) with key OFF. A low resistance indicates short to ground or B+ in the harness or at PCM.
- If harness checks show low resistance and short location not visible, isolate sections of harness (disconnect at known splice points) to narrow down location, or temporarily disconnect other components on same circuit if present.
- If harness appears good and short persists with harness disconnected from valve, suspect PCM driver fault — verify with manufacturer procedures before replacement.
- Repair or replace damaged wiring, connector, or purge valve as indicated. Replace blown fuses if present and verify PCM driver is not damaged.
- After repairs, clear codes and perform smoke/EVAP system readiness checks and a drive cycle to confirm no recurrence.
Likely causes
- Shorted or melted insulation where harness rubs on chassis or engine components
- Water intrusion/corrosion in purge valve connector causing low-resistance path
- Internal short inside the purge solenoid coil
- Connector pins pushed out, contacting ground or another terminal
- Aftermarket work or previous repairs with bundled/stressed wires
Fault status
Status
P0445 — EVAP purge control valve A circuit shorted. PCM detected an electrical short (to battery or to ground) in the purge valve control circuit. This will typically set the MIL and may prevent normal EVAP purge operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0445
LAND ROVER
P — Powertrain
Control valve circuit of the control system evaporative emissions in short circuit
Views:
UK: 12
EN: 25
RU: 21
AI status
Completed
Completed
100%
Causes
- Short to battery (B+) on purge valve control circuit
- Short to ground on purge valve control circuit
- Damaged, chafed, or pinched wiring harness or connector
- Corroded or loose connector pins at the purge valve
- Failed purge control solenoid (internal short)
- Blown fuse or failed driver in PCM/ECM
Symptoms
- Malfunction indicator lamp (MIL) illuminated
- Stored P0445 code (may be accompanied by other EVAP codes)
- Possible poor idle or drivability rarely (usually electrical issue only)
- Failed EVAP readiness test and emission test failure
- Possible faint odor of fuel vapor in some cases
What to check
- Read and record all stored codes and freeze-frame data; check for related EVAP codes
- Visual inspection of purge valve, wiring harness, and connector for damage, corrosion, or pinched wires
- Check related fuses and power supplies for the EVAP system
- Backprobe the purge valve connector with key ON (engine OFF) and observe voltages
- Use a scan tool to actuate the purge valve while monitoring circuit voltage
- Measure coil resistance of the purge valve with it disconnected from harness
Signal parameters
- Battery voltage at purge valve supply terminal with key ON (approx. 11.5–14.5 V)
- Control driver voltage: when PCM commands ON, driver should pull to near 0 V (ground) or use PWM; when OFF, driver typically high-impedance, so valve sees battery voltage
- Purge valve coil resistance (typical): approx. 15–72 ohms (varies by vehicle) — consult specific service data
- Short to ground: measured voltage near 0 V at harness connector regardless of command
- Short to battery: measured voltage near battery voltage at PCM control pin when circuit should be pulled low
Diagnostic algorithm
- Retrieve freeze-frame and other EVAP-related codes. Note vehicle conditions when code set.
- Visually inspect purge valve, connector, and wiring along full harness route for damage, chafing, melted insulation, or corrosion.
- With ignition ON (engine OFF), backprobe purge valve connector: verify battery presence at supply terminal and expected voltage at control terminal. Record values.
- Command purge valve ON using a good scan tool while observing control terminal: if driver should ground, voltage should drop near 0 V. If control terminal reads constant battery or constant 0 V regardless of command, suspect short to B+ or short to ground respectively.
- Disconnect the purge valve connector. Measure coil resistance across valve terminals with ohmmeter. Compare to specification. Very low resistance indicates internal short; open or very high indicates open circuit.
- With valve disconnected, check for shorts in harness: measure resistance from control wire to ground (should be high/OL) and to battery (should be high/OL) with key OFF. A low resistance indicates short to ground or B+ in the harness or at PCM.
- If harness checks show low resistance and short location not visible, isolate sections of harness (disconnect at known splice points) to narrow down location, or temporarily disconnect other components on same circuit if present.
- If harness appears good and short persists with harness disconnected from valve, suspect PCM driver fault — verify with manufacturer procedures before replacement.
- Repair or replace damaged wiring, connector, or purge valve as indicated. Replace blown fuses if present and verify PCM driver is not damaged.
- After repairs, clear codes and perform smoke/EVAP system readiness checks and a drive cycle to confirm no recurrence.
Likely causes
- Shorted or melted insulation where harness rubs on chassis or engine components
- Water intrusion/corrosion in purge valve connector causing low-resistance path
- Internal short inside the purge solenoid coil
- Connector pins pushed out, contacting ground or another terminal
- Aftermarket work or previous repairs with bundled/stressed wires
Fault status
Status
P0445 — EVAP purge control valve A circuit shorted. PCM detected an electrical short (to battery or to ground) in the purge valve control circuit. This will typically set the MIL and may prevent normal EVAP purge operation.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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