P1445 is a manufacturer-specific OBD-II diagnostic trouble code. Because it is manufacturer-specific, its exact definition depends on the vehicle application, often relating to the evaporative emission control system.
The exact application must be verified before diagnosis. The code indicates a detected condition in the relevant circuit or sensor, but testing is required to identify the root cause.
Quick Navigation
Key Takeaways
- P1445 is a manufacturer-specific code, meaning its exact definition varies by automaker and vehicle application.
- On many Ford and Mazda applications, it indicates a high voltage condition in the purge flow sensor circuit.
- On certain Nissan and Volkswagen applications, it may relate to the EVAP purge volume control solenoid or valve circuit.
- Diagnosis requires verifying the exact factory definition and testing the relevant wiring, sensors, or EVAP components.
P1445 Code Description and Implications
P1445 is a manufacturer-specific powertrain code. Because the second digit is “1”, the definition is controlled by the automaker rather than the SAE standardized list.
Some Ford, Mazda, and Jaguar applications: P1445 indicates a high voltage signal or circuit malfunction in the evaporative emission (EVAP) purge flow sensor.
Certain Nissan, Infiniti, and Volkswagen applications: P1445 may indicate an electrical fault in the EVAP purge volume control solenoid valve or purge valve circuit.
When the control module detects an unexpected voltage or circuit condition, it sets this error code. Because this is a manufacturer-specific code, the exact definition and diagnostic steps vary by automaker.
Common Causes of the P1445 Code
Possible causes depend entirely on the specific vehicle application.
For purge flow sensor applications, causes include damaged wiring, corroded connectors, a failed sensor, or a blocked EVAP hose.
For purge solenoid applications, causes may include a stuck or failed solenoid valve, wiring shorts or opens, or a clogged charcoal canister.
In rare cases, an internal control module fault can trigger the code.
Symptoms Associated With P1445
The primary symptom is an illuminated check engine light.
Because this code relates to the EVAP system, drivers rarely experience rough idling, stalling, or severe power loss.
The vehicle will likely fail an emissions inspection because the EVAP monitor cannot complete or has detected a fault.
In some cases, a noticeable fuel odor may be present if the purge valve is stuck open.
Diagnosing the P1445 Trouble Code
Diagnosis must begin by confirming the exact factory definition for the specific make, model, and year.
For purge flow sensor applications, technicians inspect the sensor wiring for shorts to voltage and test the sensor’s signal output against manufacturer specifications.
For purge valve applications, diagnosis involves checking the valve’s internal resistance, verifying power and ground circuits, and testing for vacuum flow.
Technicians also inspect the EVAP system hoses and charcoal canister for physical blockages or leaks.
Repairing the P1445 Issue
Repairs follow the confirmed diagnosis for the specific application.
If wiring damage or a short circuit is found, repairing the harness and clearing the code resolves the electrical fault.
If the purge flow sensor or purge control solenoid fails the electrical and functional tests, replacing the confirmed failed component is required.
If a blocked EVAP line or clogged charcoal canister is found, clearing the restriction restores proper system flow.
Cost Considerations for P1445 Repairs
Repair costs vary depending on the underlying fault and the vehicle application.
Replacing an EVAP purge solenoid or flow sensor involves standard parts and labor.
If the repair requires replacing the charcoal canister due to internal contamination, parts costs increase.
Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.
Prevention Strategies for Future Occurrences
Inspecting exposed EVAP system wiring and vacuum hoses can help identify developing damage from road debris, heat, or corrosion.
Avoiding overfilling the fuel tank helps prevent liquid fuel from entering the charcoal canister, which can degrade the canister and contaminate the purge valve.
Troubleshooting Tips and Best Practices
Never assume a manufacturer-specific code has a universal meaning. Always verify the exact factory service information for your specific vehicle.
Do not replace the purge flow sensor or solenoid without first verifying the wiring, connectors, and actual vacuum flow through the EVAP lines.
If P1445 is accompanied by other EVAP system codes, the diagnosis must address the combined system faults rather than treating them in isolation.
More OBD-II Codes
| P1431 | P1432 | P1433 | P1441 |
| P1444 | P1446 | P1447 | P1448 |
| P1449 | P1450 | P0440 | P0441 |
| P0442 | P0446 | P0455 | P0456 |
| P1456 | P1457 | P0171 | P0174 |
| P0300 | P0420 | P0430 | P1475 |
Frequently Asked Questions
Is P1445 a generic OBD-II code?
No. P1445 is a manufacturer-specific code, meaning its exact definition and diagnostic procedure depend entirely on the vehicle’s make, model, and application.
Can I drive my vehicle with a P1445 code?
Yes, you can generally drive the vehicle, as EVAP faults rarely affect drivability. However, the vehicle will likely fail an emissions inspection until repaired.
Will a P1445 code cause poor fuel economy?
Rarely. EVAP system faults typically do not affect engine performance. However, if the purge valve is mechanically stuck open, it could slightly alter fuel trims.
Does P1445 always mean the sensor is broken?
No. The code often points to an electrical fault like damaged wiring, a corroded connector, or a mechanical issue like a blocked EVAP vacuum line.
How do I clear a manufacturer-specific P1445 code?
Clearing the code requires fixing the underlying electrical, mechanical, or vacuum fault. Simply using a scan tool to erase the code will not repair the root cause.
What Should You Do About the P1445 Code?
Confirm the exact factory definition for your specific vehicle, then follow the applicable manufacturer diagnostic procedure for the relevant system and components.
Because P1445 is manufacturer-specific, testing the exact wiring circuits, sensors, or EVAP valves identified by the factory service information is required to find the root cause.
Once the fault is confirmed, perform the necessary repairs and verify the fix by clearing the codes and completing the EVAP monitor drive cycle.
