P1605 — Powertrain Control Module Keep Alive Memory Test Error

What Does P1605 Mean?

P1605 is a manufacturer-specific diagnostic trouble code: Powertrain Control Module Keep Alive Memory Test Error. This code applies to MAZDA, VOLKSWAGEN, FORD, LINCOLN, MERCURY vehicles. Unlike generic OBD-II codes, manufacturer-specific codes are defined by the vehicle maker and may only apply to certain makes and models.

Symptoms of P1605

⚠️ Check Engine Light (MIL) illuminated
⚠️ Powertrain Control Module Keep Alive Memory Test Error not functioning as expected
⚠️ Related system may be in fail-safe mode
⚠️ Reduced engine performance

Common Causes

🔍 Faulty Powertrain Control Module Keep Alive Memory Test Error
🔍 Wiring or connector issue in Powertrain Control Module Keep Alive Memory Test Error circuit
🔍 Related mechanical or electrical fault
🔍 ECM/PCM issue (rare)

Frequently Asked Questions

What does P1605 mean?

P1605 indicates: Powertrain Control Module Keep Alive Memory Test Error. The vehicle's computer has detected that the Powertrain Control Module Keep Alive Memory Test Error is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code P1605?

You can drive short distances for essential trips, but schedule a diagnosis soon. Driving with P1605 for extended periods may cause additional problems.

How much does it cost to fix P1605?

Repair costs for P1605 typically range from $80 to $300, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Inspect Powertrain Control Module Keep Alive Memory Test Error and related wiring
🔧 Replace faulty Powertrain Control Module Keep Alive Memory Test Error

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P1605: Powertrain Control Module Keep Alive Memory Test Error