P1605 Ford Code - PCM Keep Alive Memory Test Error Conditions
Quick Answer
With the Key On Engine Off (KOEO) the Diagnostic Trouble Code (DTC) P1605 indicates Powertrain Control Module (PCM) has experienced power interrupt in the keep-alive power circuit. Common causes include Low battery charge, Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted. 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 Low battery charge, Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted.
- 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.
Code P1605 Ford Description
What are the Possible Causes of the DTC P1605 Ford?
- Low battery charge
- Faulty Powertrain Control Module (PCM)
- Powertrain Control Module harness is open or shorted
- Powertrain Control Module circuit poor electrical connection
How to Fix the DTC P1605 Ford?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1605 Ford code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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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