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P1605 Ford Code - PCM Keep Alive Memory Test Error Conditions

Quick Answer

The P1605 Ford code indicates a PCM (Powertrain Control Module) Keep Alive Memory Test Error Conditions. Common causes include Weak or dead battery, Faulty PCM, Electrical problems. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1605 Ford indicates PCM Keep Alive Memory Test Error Conditions.
Common causes
Common causes include Weak or dead battery, Faulty PCM, Electrical problems.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P1605 Ford Description

The P1605 Ford code indicates a PCM (Powertrain Control Module) Keep Alive Memory Test Error Conditions. The PCM is essentially the brain of the vehicle, responsible for controlling various systems such as the engine, transmission, and emissions. The Keep Alive Memory (KAM) is a small amount of memory within the PCM that stores essential data even when the vehicle is turned off. This data includes learned adjustments for optimal engine performance, idle speed, and emission control.

OBDII Code P1605 Ford - PCM Keep Alive Memory Test Error Conditions
P1605 Ford Code - PCM Keep Alive Memory Test Error Conditions

Common Causes of P1605 Ford

  1. Weak or dead battery.
  2. Faulty PCM.
  3. Electrical problems.
  4. Loose or corroded connections.
  5. Issues with the vehicle's wiring harness.

Symptoms of P1605 Ford

  1. Check Engine Light is illuminated.
  2. Poor fuel efficiency.
  3. Rough idling or stalling.
  4. Hesitation or lack of power during acceleration.
  5. Vehicle may fail to start.

How to Fix P1605 Ford

  1. Begin by checking the battery voltage and ensuring it is at the correct level. If the battery is weak or dead, recharge or replace it.
  2. Inspect the wiring harness and connections for any signs of damage, corrosion, or looseness. Repair or replace as needed.
  3. Perform a diagnostic scan to identify any specific fault codes and address them accordingly.
  4. If the PCM is determined to be faulty, it may need to be reprogrammed or replaced by a qualified technician.
  5. Clear the fault codes and reset the PCM to ensure proper operation.

Cost to Fix P1605 Ford

The typical repair costs for addressing a P1605 Ford code can vary depending on the specific cause of the issue. In general, the cost for parts such as a new PCM can range from $500 to $1000, while labor costs can range from $100 to $300. However, these costs can fluctuate based on factors such as the location, vehicle make and model, and the labor rates of the auto repair shop. It is advisable to obtain quotes from different shops to get a more accurate estimate.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1605 Ford Code

1. What does the OBDII code P1605 mean on a Ford vehicle?

P1605 indicates a "PCM Keep Alive Memory Test Error," meaning the Powertrain Control Module (PCM) has detected an issue with its ability to retain memory when the vehicle is off.

2. What are the common symptoms of the P1605 code?

Symptoms can include difficulty starting the vehicle, erratic engine performance, illuminated check engine light, and loss of stored PCM settings like idle and fuel trim data.

3. What causes the P1605 code to trigger?

Common causes include a weak or disconnected battery, corroded or loose battery terminals, faulty PCM, or damaged wiring to the PCM.

4. Can a dead battery cause the P1605 code?

Yes, a dead or weak battery can cause the PCM to lose its memory, triggering the P1605 code.

5. How do I fix the P1605 code on my Ford vehicle?

Start by checking the battery voltage and ensuring the terminals are clean and secure. If the battery and connections are fine, inspect the wiring to the PCM and test the PCM itself for faults.

6. Can I drive my car with the P1605 code?

While the car may still be drivable, it could experience performance issues. It's recommended to address the code promptly to avoid further complications.

7. Does the P1605 code always mean the PCM is bad?

No, the PCM is not always the issue. The problem could be related to battery voltage, wiring, or other electrical components.

8. How do I reset the P1605 code?

After repairing the issue, you can clear the code using an OBDII scanner. However, if the underlying problem isn’t resolved, the code will return.

9. How much does it cost to fix the P1605 code?

The cost depends on the root cause. Battery or wiring repairs are typically inexpensive, while PCM replacement can range from $500 to $1,500 or more.

10. Can a bad alternator cause the P1605 code?

Yes, a malfunctioning alternator can lead to inconsistent voltage, which may result in the PCM losing its memory and triggering the P1605 code.

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