P3425 Fault Code Troubleshooting help please!

[Wally604]

Hey, first post (it’s a long one), so I’ll do my best to provide all the information I have. I have a 2010 1500 5.7L Hemi. Since I bought it I’ve had the Diablo Predator hooked up to lowest or middle setting. No problems (except when my recalled driveshaft fell off in Montana, and a problem with the blend door actuator). A week ago my check engine ligh came on, so I stopped driving it and used my work vehicle.

1. I bought a cheap scanner on Amazon and recieved a P3425 code (Cylinder 4 deactivation/intake - Valve control circuit open)

2. Researched possible causes and thought I would start with an oil change.

3. Hooked up Predator and returned to factory setting before doing ANYTHING.

4. Check engine light disappeared.

5. Hooked up scanner and it didn’t detect any faults. But still had the original fault stored in the memory.

6. Got an oil change anyways.

7. Noticed my blend door actuator that had been giving me a headache for years is about 95% effective now! Bonus

So what gives? I deffinetley don’t want to drive if the problem still exists. I want to repair it or have it repaired if it’s beyond my scope. I will say that my K&N air filter is deffinetley due for a cleaning. Thanks for any information, my apologies for the long post.

 

[ram1500rsm]

It seems something with that Diablo tune?
When was the last time you updated the device?
Drive it around with the stock tune and see if p3425 is set again.

 

[Wally604]

I’ve actually never updated the device. I’m crossing my fingers that it was due to the tune. I forgot to mention that the check engine light came on when I started on a large hill and put my foot in to it. For now I’ll keep a close eye on it and clean the air filter. I have the Haynes manual, but I’m having a hard time locating the solenoid to check the wiring and connections. But I have to assume that if it’s a short, it would’ve come back right away....or sometime soon. Thanks for the advice!

 

[jljbtm]

I think codes are stored for a while like x amount of key starts if the problem goes away or doesn't return I should say then the light will go out. So you might just drive it for another week and see if the code disappears. That does seem too easy

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