Ford Error Code P1390: How to Fix It

Q: Can I drive my Ford with P1390 code?

Yes, you can typically drive safely with P1390 as it's a low-severity code that won't cause immediate engine damage. However, you may experience slightly reduced fuel economy or performance, so it should be addressed promptly.

Q: What causes Ford P1390 error code?

P1390 is usually caused by PCM software issues, faulty wiring in the octane adjustment circuit, or internal PCM problems. It's less commonly caused by actual hardware failures and more often resolved with software updates.

Q: How much does it cost to fix Ford P1390?

If resolved with a software update, costs typically range from $100-200. If wiring repair or PCM replacement is needed, costs can range from $300-1200 depending on the specific issue and labor rates.

Q: Is P1390 covered under Ford warranty?

P1390 may be covered under Ford's powertrain warranty if your vehicle is still within the warranty period. Some Ford models have extended coverage for PCM-related issues through technical service bulletins.

Q: Will P1390 cause my Ford to fail emissions testing?

P1390 may prevent your vehicle from passing emissions testing in some states, as any stored diagnostic trouble codes can result in test failure. Clear the code and ensure it doesn't return before emissions testing.

Abstract

Ford error code P1390 indicates an octane adjust pin fault in your vehicle's engine control system. This code means the PCM (Powertrain Control Module) has detected an issue with the octane adjustment circuitry, which helps optimize engine timing based on fuel quality. While this is typically a low-severity issue that won't cause immediate damage, it should be addressed to ensure optimal engine performance.