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P3401 is a diagnostic trouble code (DTC) for "Cylinder 1 Deactivation Intake Valve Control Circuit Open". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Cylinder 1 Deactivation Intake Valve Control Circuit Open
P3401 is an OBD-II generic code for the engine control module (ECM) detecting that the intake control solenoid for cylinder number 1 is either shorted, open, or has a high resistance.
The engine control module controls the 4 or 8 cylinder modes of the engine by controlling the intake deactivating solenoids for four of the engine cylinders. The ECM can detect each of the four solenoids individually for shorts, open circuits, or high resistance.
The code is set when the cylinder number one has one of these three problems when the engine is commanded to go to four cylinder operation.
The Check Engine Light will be illuminated and the code is set in ECM memory as a fault.
The engine is commanded back to the eight cylinder operation and stays that way until the repairs are made. The ECM will turn off the fuel injector for the faulty cylinder.
The engine will misfire due to the turned off injector and solenoid failure.
Scans for codes and documents the codes in the ECM to look at the freeze frame data for failure.
Checks the solenoid wiring connections for problems with loose or corroded connections
Checks the number one intake deactivation solenoid for the proper resistance
Follows the manufacturer pinpoint tests for the diagnosis and replacement of the solenoid
Clearing ECM memory codes before checking the freeze frame data for the main failure problem, so the failure may be duplicated and repaired
Failing to clear the ECM codes after the codes are fixed so the ECM will enable the system to normal again
Code P3401 is a code putting the engine into failure mode and turning off the number one injector causing a misfire in that cylinder.
Code P3401 is for a shorted or open circuit for the 4 to 8 cylinder solenoid for the number 1 cylinder and can also be accompanied by the other 3 cylinders fault codes if the vehicle is having problems with the common power and ground they use in the harness for all the cylinders.
Follow the pinpoint test for the first code received and follow that one till it is finished and move to the next code. The same problem may be causing all the codes, but go to each one to make sure to fix the vehicle properly.
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