P3409 OBD-II Trouble Code: Cylinder 2 Deactivation/Intake Valve Malfunction

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P3409 code

P3409 is a diagnostic trouble code (DTC) for "Cylinder 2 Deactivation/Intake 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 for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 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 $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P3409 DIAGNOSTIC Get a fair and transparent estimate upfront

P3409 code definition

The P3409 code is Cyl2 Deactivation/Intake Valve Control Circuit/Open. Cyl2 narrows the issue down to engine cylinder number 2. Other codes in the P3400 series may present concurrently with P3409, indicating a problem with another cylinder’s deactivation solenoid circuit.

What the P3409 code means

In an engine with eight or more cylinders, most modern vehicles are equipped with a feature which allows half of the cylinders to deactivate during times of light load operation. This enhances fuel economy and reduces emissions. The vehicle will only operate on all cylinders when needed – such as when starting, idling, or under heavier loads. If the MAF (mass airflow), MAP (manifold absolute pressure), or TP (throttle position) sensors send a signal to the ECM (engine control module) that is outside of the expected range, deactivation in one or more cylinders is affected and a P3400 code will set. In the case of P3409, this typically means that the intake control solenoid circuit has an open, a short, or high resistance.

What causes the P3409 code?

Several possible problems could cause the ECM to receive an inaccurate signal from the sensors, including:

  • A bad MAP, MAF, or TP sensor
  • Valve lifter malfunction
  • Low oil pressure caused by an obstructed oil passageway
  • A faulty cylinder deactivation solenoid circuit connection
  • A short in the solenoid wiring harness
  • Restricted fuel pressure
  • A mechanical problem in the engine
  • A faulty PCM or ECM (rare)

What are the symptoms of the P3409 code?

You may experience misfires and/or vibration when the engine is running, as well as an illuminated Check Engine light. The vehicle will only operate in the higher mode (V8, or V12 in the case of a 12-cylinder engine).

How does a mechanic diagnose the P3409 code?

Your professional will make sure the oil level and pressure are correct, and will verify the stored code using a code scanner. If there are other fault codes present, these should be addressed in the same order as the data indicates they occurred. Then the codes are cleared and the vehicle retested to be sure the code replicates. The technician will perform a visual inspection of the wiring and connections to check for corrosion or loose connectors. Next comes testing the cylinder deactivation solenoid with a scan tool. He or she will check the oil passages to see if there’s any sludge or blockage. If all of these tests turn out fine, the valve lifters may be inspected to see if they’re the source of the problem.

Common mistakes when diagnosing the P3409 code

It can be tempting to simply replace the deactivation solenoid and/or wiring, without checking for oil restriction, which is a common culprit in this issue.

How serious is the P3409 code?

This code may not seem serious at first, because the vehicle will likely continue to be operational. It can lead to further damage however, because the ECM turns off the faulty cylinder, causing the engine to run rough. It’s best to have the problem looked at as soon as you can.

What repairs can fix the P3409 code?

Repairing this code could involve one or more of the following:

Additional comments for consideration regarding the P3409 code

The engine cylinders are controlled by a complex network of components, which can make it difficult to narrow down the problem unless you’re a seasoned mechanic. Your professional has tools that provide more detailed information than most tools available to home users, allowing them to complete the diagnosis and repair much more quickly and efficiently. In addition, if the engine must be disassembled, this can be extremely time-consuming and labor-intensive unless handled by a pro.

Need help with a P3409 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.

Check Engine Light
trouble codes
P3409

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P3409 code.

SCHEDULE P3409 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7400)

Rating Summary
6879
249
58
41
173
6879
249
58
41
173
 at YourMechanic

David

13 years of experience
393 reviews
David
13 years of experience
Chevrolet Malibu L4-2.4L - Check Engine Light is on Inspection - Marietta, Georgia
He explained everything to me in detail on what I needed to know about my car. Definitely recommend him for getting the job done.
 at YourMechanic

Raymond

37 years of experience
402 reviews
Raymond
37 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Las Vegas, Nevada
Raymond did a great job however I was charged for two hours labor and he was only here less than 45 minutes. should I expect this on future appointments with your mechanic ?
 at YourMechanic

Shane

17 years of experience
217 reviews
Shane
17 years of experience
Volkswagen EuroVan V6-2.8L - Check Engine Light is on Inspection - Austin, Texas
Arrived on time. Explained the issues he found and how he will fix it. I have parts on order and will schedule an appointment to have Shane install the parts when they arrive.
 at YourMechanic

Kanstantsin

19 years of experience
51 reviews
Kanstantsin
19 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on Inspection - Littleton, Colorado
Kanstantsin arrived early. Was very courteous and professional. Will highly recommend to anyone. Thank you Kanstantsin.


More related articles

P0226 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance Problem
P0226 P0226 code definition Throttle/Pedal Position Sensor/Switch C Circuit Range/Performance Problem What the P0226 code means P0226 is a generic OBD-II code which indicates that the throttle/pedal position sensor/switch C circuit has a range or performance problem causing the sensor...
P2032 OBD-II Trouble Code: Exhaust Gas Temperature (EGT) Sensor Circuit Low Voltage Bank 1 Sensor 2
P2032 P2032 code definition Exhaust Gas Temperature (EGT) Sensor Circuit Low Voltage Bank 1 Sensor 2 What the P2032 code means This code indicates there is a problem with the catalytic converter or the system that monitors the efficiency of...
P0357 OBD-II Trouble Code: Ignition Coil G Primary/Secondary Circuit Malfunction
P0357 P0357 code definition When the P0357 code is stored, it means that the PCM has detected one or more ignition coils (https://www.yourmechanic.com/services/ignition-coil-replacement) is faulty to some degree. What the P0357 code means Most vehicles with an OBD-II system utilize...

Related questions

Car throws code: P0301 even after I have changed spark plugs, fuel injector, fuel filter, ignition coils.
The engine intake near cylinder one should be checked when first started to see if there is any vacuum leaks at intake gasket (https://www.yourmechanic.com/services/intake-manifold-gaskets-replacement) or the injector O-ring. If no vacuum leaks are found then you may be having a...
Bank 2 Sensor 1 PA03(?) code. Range performance issue?
Hello. The code (https://www.yourmechanic.com/services/check-engine-light-is-on-inspection) you have provided is not a valid automotive error code that I recognize. Based on your context I think it may be possible that there is an issue with the signal range of one of your...
limp mode
This problem may be a wire connection or TCM or PCM issue. The first thing that has to be done is to get communication with the TCM. The different computers communicate all to the engine computer and then to the...

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 (855) 347-2779 · hi@yourmechanic.com