AutoCodes – Jeep – P3402 Jeep

P3402 Jeep Code - Cylinder 1 Deactivation Control Performance

Quick Answer

When all the criteria has been met,power is supplied to each Multi-Displacement System (MDS) Solenoid when engine is making a transition from 8 cylinder mode to 4 cylinder mode. Common causes include Low oil pressure, Restricted oil passage, Engine mechanical condition. 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: P3402 Jeep indicates Cylinder 1 Deactivation Control Performance.
Common causes: Common causes include Low oil pressure, Restricted oil passage, Engine mechanical condition.
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.

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Code Popularity 1,911

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 05, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P3402 Jeep Description

When all the criteria has been met,power is supplied to each Multi-Displacement System (MDS) Solenoid when engine is making a transition from 8 cylinder mode to 4 cylinder mode. By actuating the solenoid, oil pressure is raised to the pair of lifter that coincide with each particular solenoid. The oil pressure pushes in the locking pins that allows the lifter to collapse, decoupling the valves and camshafts.

OBDII Code P3402 Jeep - Cylinder 1 Deactivation Control Performance - AutoCodes.com — P3402 Jeep Code - Cylinder 1 Deactivation Control Performance

What does this mean?

What are the Possible Causes of the DTC P3402 Jeep?

Low oil pressure
Restricted oil passage
Engine mechanical condition
Faulty Multiple Displacement System (MDS) Solenoid
Multiple Displacement System (MDS) Solenoid harness is open or shorted
Multiple Displacement System (MDS) Solenoid circuit poor electrical connection

How to Fix the DTC P3402 Jeep?

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 does this mean?

Code Tech Notes

Although in some cases changing the engine oil may fix the problem, usually the Multi Displacement System Solenoid may need to replaced.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P3402 Jeep 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P3402 Jeep Code

What does the OBDII code P3402 mean on a Jeep?

P3402 indicates a problem with the Cylinder 1 Deactivation Control Performance, usually related to the engine's Multi-Displacement System (MDS) not properly deactivating or reactivating cylinder 1.

What are the common symptoms of code P3402 on a Jeep?

Symptoms may include reduced fuel efficiency, rough engine performance, misfires, illuminated check engine light, and possible loss of power during acceleration.

What causes the P3402 code to appear on a Jeep?

Common causes include a malfunctioning MDS solenoid, low oil pressure, dirty or degraded engine oil, a faulty lifter, or wiring and connectivity issues in the MDS system.

Can low oil pressure trigger the P3402 code on a Jeep?

Yes, low oil pressure can prevent the MDS system from functioning correctly, leading to the P3402 code. Maintaining proper oil levels is crucial.

How can I diagnose the P3402 code on my Jeep?

Start by checking the engine oil level and condition, inspect the MDS solenoid for cylinder 1, and test for wiring or connector issues. A scan tool can also help monitor MDS activation and deactivation.

Can driving with the P3402 code damage my Jeep's engine?

Prolonged driving with this code can lead to further engine issues, such as excessive wear on cylinder 1 components, misfires, or damage to the MDS system.

How do I fix the P3402 code on a Jeep?

Common fixes include replacing the MDS solenoid for cylinder 1, addressing oil pressure issues, cleaning or replacing lifters, and repairing damaged wiring or connectors in the MDS system.

Does the P3402 code always require a solenoid replacement?

Not always. While a faulty MDS solenoid is a common cause, itâ€™s essential to check for other issues, such as low oil pressure or wiring problems, before replacing the solenoid.

Can dirty engine oil cause the P3402 code on a Jeep?

Yes, dirty or degraded oil can interfere with the MDS system's operation, leading to code P3402. Regular oil changes can help prevent this issue.

Is the P3402 code specific to Jeeps with MDS systems?

Yes, this code typically applies to Jeep models equipped with Multi-Displacement Systems, as it relates to the deactivation and reactivation of specific cylinders.