P1605 Mazda 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 Mazda 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 Mazda Description
What are the Possible Causes of the DTC P1605 Mazda?
- 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 Mazda?
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 Mazda 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 Mazda Code
1. What does the OBDII code P1605 mean on a Mazda?
P1605 indicates a "PCM Keep Alive Memory Test Error," meaning the Powertrain Control Module (PCM) is unable to retain critical data when the vehicle is off.
2. What are the common symptoms of a P1605 code in a Mazda?
Symptoms may include difficulty starting the vehicle, stalling, erratic engine performance, or the Check Engine Light being illuminated.
3. What causes a P1605 code to appear?
Common causes include a weak or failing battery, corroded or damaged battery terminals, a faulty PCM, or wiring issues affecting the PCM's power supply.
4. Can a dead battery trigger the P1605 code?
Yes, a dead or weak battery can cause the PCM to lose its keep-alive memory, triggering the P1605 code.
5. How do I fix the P1605 code on my Mazda?
Start by checking the battery and battery connections for damage or corrosion. If the battery is healthy, inspect wiring to the PCM and replace the PCM if necessary.
6. Can I drive my car with a P1605 code?
While the car may still run, driving with a P1605 code can lead to poor engine performance or stalling, so it’s best to address the issue promptly.
7. How is the P1605 code diagnosed?
A technician will check the battery voltage, inspect PCM wiring for continuity, and test the PCM itself to determine the root cause.
8. Can a P1605 code clear itself?
The P1605 code may clear temporarily if the battery is recharged or connections are fixed, but the underlying problem must be resolved to prevent recurrence.
9. Does a bad PCM always cause the P1605 code?
No, while a faulty PCM can cause P1605, more common issues include battery or wiring problems affecting the keep-alive memory system.
10. How much does it cost to repair a P1605 code on a Mazda?
Costs vary depending on the issue. Battery replacement typically costs $100–$250, while PCM repair or replacement can exceed $500, including labor.
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