P3408 OBD-II Trouble Code: Cylinder 1 Deactivation/Exhaust Valve Malfunction

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P3408 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P3408 code

P3408 is a diagnostic trouble code (DTC) for "Cylinder 1 Deactivation/Exhaust Valve Malfunction". 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P3408 DIAGNOSTIC Get a fair and transparent estimate upfront

P2408 code definition

P2408 is the fault code for Cyl1 Exhaust Valve Ctrl Circ High. Cyl1 specifies that the issue is likely taking place in engine cylinder number 1.

What the P2408 code means

Late model vehicles with eight or more cylinders are designed so that half of the cylinders deactivate, by way of the ECM (engine control module) disabling the fuel injectors. This deactivation conserves fuel economy under light load operating conditions when all cylinders aren’t needed. The ECM (engine control module) receives information about operating conditions from various sensors, like the MAF (mass airflow) sensor, and commands the cylinders on or off based upon that data. When the ECM receives a signal from these sensors that is not within the reference range, it will set a code alerting you to the situation – in this case a code that tells you the problem is happening at the exhaust valve of cylinder 1.

What causes the P2408 code?

Cylinder deactivation can be affected by a number of problems, including:

  • A faulty MAP, MAF, or TP sensor
  • A bad valve lifter
  • Low oil pressure caused by sludge or dirt in oil passages
  • A short or damage in the wiring or connectors
  • Abnormal fuel pressure

On rare occasions, this problem may be caused by a faulty PCM or ECM, but this is typically not the case.

What are the symptoms of the P2408 code?

Cylinder deactivation malfunctions may cause the Check Engine light to come on. The vehicle will not be able to switch to V4 mode, and you may experience vibrations. If the issue is not addressed, you may notice a loss in fuel efficiency.

How does a mechanic diagnose the P2408 code?

Steps that may be done to diagnose P2408 include:

Common mistakes when diagnosing the P2408 code

The complete recommended diagnostic protocol should be carried out. If parts are replaced without testing all associated components, expensive, unnecessary repairs may result. Special attention should be paid to making sure the oil pressure is correct and cleaning out oil passages if it’s not.

How serious is the P2408 code?

This isn’t a code that will stop the vehicle from operating; however, over time additional damage could occur due to added stress on the engine from running in a way it wasn’t designed to run. It’s best to have a qualified mechanic assess the problem as soon as possible.

What repairs can fix the P2408 code?

A cylinder 1 deactivation malfunction may involve one or more of the following repairs:

Additional comments for consideration regarding the P2408 code

While your home scanner may give you a general idea of your vehicle’s problem, a qualified technician is equipped with tools that provide much more detailed information that can help in the diagnosis and repair of a cylinder deactivation circuit problem. The complex network of circuitry and sensors can make it difficult to pinpoint the issue without the proper tools and a considerable amount of time and effort. Consulting a professional can make the job faster and more efficient, and get your vehicle running smoothly and back on the road again.

Need help with a P2408 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

P3408
trouble codes
Check Engine Light

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P3408 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

4,810

Rating Summary
4,424
187
47
28
124
4,424
187
47
28
124

Joel

19 years of experience
741 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

Christopher

15 years of experience
41 reviews
Christopher
15 years of experience
Honda Accord - Check Engine Light is on - Fairburn, Georgia
Christopher was excellent! He explained everything in detail to make sure I understood. He was professional and provided me with the next course of actions to resolve my care issues. I'm glad he was sent to service my car.

Alexander

18 years of experience
58 reviews
Alexander
18 years of experience
Saab 9-7x - Check Engine Light is on - Kissimmee, Florida
He was very friendly and very helpful . I felt like it was being around a close friend , also gave me so very good advice on my car & future advice about it . Highly recommend mechanic, would use his services again .

Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Jeep Patriot - Check Engine Light is on - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

More related articles

P0014 OBD-II Trouble Code: Camshaft Position B - Timing Over-Advanced or System Performance (Bank 1)
P0014 code definition Camshaft Position “B” - Timing Over-Advanced or System Performance (Bank 1) What the P0014 code means P0014 is the...
P2049 OBD-II Trouble Code: Reductant Injector Circuit High Voltage Bank 1 Unit 1
P2049 P2049 code definition Reductant Injector Circuit High Voltage Bank 1 Unit 1 What the P2049 code means This code indicates there is a problem with the electrical circuit that controls the reductant injector. What causes the P2049 code?...
P2138 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation
P2138 Code Definition Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation What the P2138 code means The P2138 trouble code indicates that the...

Related questions

Getting Red Lighting Bolt Warning Light and Check Engine Light

Hi there. Assuming the Check Engine Light and red lightning bolt were on before your vehicle experienced the no start condition. This would indicate a malfunction in the electronic throttle control system. The computer has recognized the fault and stored...

Check engine light on, lost engine power 2x, now get 5-6 mpg less..ideas?

You will need to have the engine computer scanned again to get the codes and then properly diagnose any codes that are received. Fuel evaporative codes may cause the truck to run richer than normal but should not cause the...

Car smoking and won't go into reverse without stalling.

I would ask for help from a mechanic to check the code that is turning on the check engine light. The code in the computer will give the mechanic a starting point for his diagnosis. There are many reasons why...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com