Ford P1605 Error Code: How to Fix It

Q: What causes Ford P1605 error code?

Ford P1605 is caused by PCM keep-alive memory power loss, most commonly from battery disconnection, replacement, or temporary power loss. It can also occur due to weak battery voltage or loose battery connections.

Q: Can I drive with Ford P1605 code?

Yes, you can safely drive with P1605 code as it's informational only. However, the vehicle may experience temporary rough idle or slight performance issues until the PCM relearns engine parameters through normal driving.

Q: Will Ford P1605 clear itself?

P1605 may clear itself after several drive cycles as the PCM completes its relearn process, but manually clearing the code with an OBD2 scanner and performing a proper drive cycle is the most reliable method.

Q: How long does PCM relearn take after P1605?

PCM relearn typically takes 15-30 minutes of varied driving conditions. The process includes idle relearn, fuel trim adaptation, and transmission shift point relearning depending on your Ford model.

Q: Does P1605 affect Ford warranty?

P1605 does not affect your Ford warranty as it's a normal occurrence after battery service. However, if the code persists or causes drivability issues, warranty coverage may apply for diagnosis and repair.

Abstract

Ford error code P1605 indicates that your vehicle's Powertrain Control Module (PCM) has lost its keep-alive memory power, typically caused by a recent battery disconnection or replacement. This is usually a minor issue that resolves itself after driving, but may require manual reset procedures in some cases.