The Dodge Code P3400 is a cylinder deactivation system that supplies power to each MDS solenoid when the engine is making a transition from 8-cylinder mode to 4 cylinder mode. This system is meant to reduce fuel consumption and enhance engine performance. Unfortunately, when all criteria has not been met, it can lead to a host of issues, including insufficient oil pressure acting on the lifter locking pins, oil passages being restricted, and lifters and MDS solenoid malfunctions. In order to better understand what causes these issues and how to fix them, let’s take a closer look at the Dodge Code P3400.
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Causes and Solutions for Dodge Code P3400
| Cause | Solution |
|---|---|
| INSUFFICIENT OIL PRESSURE ACTING ON THE LIFTER LOCKING PINS | Replace the oil filter, change the oil, and check the oil pressure. |
| OIL PASSAGES RESTRICTED | Clean the oil passages and replace the oil pump if necessary. |
| LIFTER | Replace the lifters and inspect the camshaft. |
| MDS SOLENOID | Replace the MDS solenoid and inspect the wiring. |
Insufficient Oil Pressure Acting on the Lifter Locking Pins
The Dodge Code P3400 can cause insufficient oil pressure acting on the lifter locking pins. This can be caused by a clogged oil filter, old or low-grade oil, or an inadequate oil pump. To fix this issue, replacing the oil filter, changing the oil, and checking the oil pressure is recommended.
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Oil Passages Restricted
If the oil passages are restricted, this can cause the Dodge Code P3400 to activate. To fix this issue, cleaning the oil passages and replacing the oil pump, if necessary, is recommended.
Lifter Malfunction
When the lifters malfunction, this can lead to the Dodge Code P3400 being activated. To fix this issue, replacing the lifters and inspecting the camshaft is recommended.
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MDS Solenoid Malfunction
When the MDS solenoid malfunctions, this can lead to the Dodge Code P3400 being activated. Replacing the MDS solenoid and inspecting the wiring is recommended to fix this issue.
Conclusion
The Dodge Code P3400 is a cylinder deactivation system that can cause a host of issues if all criteria have not been met. In order to fix these issues, it is essential to understand the causes and appropriate solutions. By replacing the oil filter, changing the oil, checking the oil pressure, cleaning the oil passages and replacing the oil pump, replacing the lifters and inspecting the camshaft, and replacing the MDS solenoid and inspecting the wiring, these issues can be corrected, allowing the Dodge Code P3400 to function correctly.
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