Exception in rendering!

Message: window is not defined

ReferenceError: window is not defined
    at new c (/tmp/execjs20161209-4303-8y14vzjs:136:3912)
    at m.mountComponent (/tmp/execjs20161209-4303-8y14vzjs:47:15602)
    at /tmp/execjs20161209-4303-8y14vzjs:49:31860
    at a.r.perform (/tmp/execjs20161209-4303-8y14vzjs:47:12503)
    at Object.a [as renderToString] (/tmp/execjs20161209-4303-8y14vzjs:49:31821)
    at r (/tmp/execjs20161209-4303-8y14vzjs:50:21164)
    at Object.S.ReactOnRails.serverRenderReactComponent (/tmp/execjs20161209-4303-8y14vzjs:32:6073)
    at eval (eval at <anonymous> (/tmp/execjs20161209-4303-8y14vzjs:173:8), <anonymous>:10:23)
    at eval (eval at <anonymous> (/tmp/execjs20161209-4303-8y14vzjs:173:8), <anonymous>:17:3)
    at /tmp/execjs20161209-4303-8y14vzjs:173:8

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

Check Engine Light

P3408 code definition

P3408 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 P3408 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 P3408 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 P3408 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 P3408 code?

Steps that may be done to diagnose P3408 include:

Common mistakes when diagnosing the P3408 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 P3408 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 P3408 code?

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

Additional comments for consideration regarding the P3408 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 P3408 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 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Post a question and get free advice from our certified mechanics.

ASK A QUESTION

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222 code means The manufacturer specifies a range of acceptable voltage to be produced from the throttle position...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...


Related questions

Q: VSC and Traction control lights on after wheel alignment. Unable to reset/recalibrate

A faulted sensor like the steering angle sensor can cause these systems to malfunction. A steering angle reset is required with an alignment on these vehicles and involves a procedure that includes disconnecting the battery. If you'd like a fresh...

Q: Engine shaking when driving

The Check Engine flashing is indicating an engine misfire. The ignition will need to be checked and the engine scanned to see which code is retrieved for the misfire. I recommend seeking a certified mechanic, such as one from YourMechanic,...

Q: C121C torque request signal denied and P0334 Cam shaft sensor

The cam sensor code (actually P0344), is known problem, and there is a Technical Service Bulletin (232460) that addresses this fault and repair. Check with your Dodge dealer to understand what the TSB covers or not. The C121C code has...