Exception in rendering!

Message: window is not defined

ReferenceError: window is not defined
    at new c (/tmp/execjs20161208-103658-11if5dkjs:136:3912)
    at m.mountComponent (/tmp/execjs20161208-103658-11if5dkjs:47:15602)
    at /tmp/execjs20161208-103658-11if5dkjs:49:31860
    at a.r.perform (/tmp/execjs20161208-103658-11if5dkjs:47:12503)
    at Object.a [as renderToString] (/tmp/execjs20161208-103658-11if5dkjs:49:31821)
    at r (/tmp/execjs20161208-103658-11if5dkjs:50:21164)
    at Object.S.ReactOnRails.serverRenderReactComponent (/tmp/execjs20161208-103658-11if5dkjs:32:6073)
    at eval (eval at <anonymous> (/tmp/execjs20161208-103658-11if5dkjs:173:8), <anonymous>:10:23)
    at eval (eval at <anonymous> (/tmp/execjs20161208-103658-11if5dkjs:173:8), <anonymous>:17:3)
    at /tmp/execjs20161208-103658-11if5dkjs:173:8

P3425 OBD-II Trouble Code: Cylinder 4 Deactivation/Intake Valve Control Circuit/Open

Check Engine Light

P3425 code definition

When the powertrain control module (PCM) detects that the measured values it’s getting from the mass air flow (MAF) sensor, the manifold absolute pressure (MAP) sensor, and/or the throttle position (TP) sensor are out of range or somehow irregular when compared with the proper values for the cylinder 4 deactivation mode, it will store the P3425 code.

What the P3425 code means

When driving under normal conditions without a heavy load, the PCM for an eight-cylinder vehicle will improve the vehicle’s fuel efficiency by deactivating four of its cylinders, including cylinder 4 on the right engine bank, essentially allowing it to perform as a four-cylinder vehicle.

Through the use of specially designed valve lifters, the intake and exhaust valves of the deactivated cylinders will be prevented from opening. When a P3425 code is set, it indicates that the PCM is not receiving the proper values from the MAP, MAF, and TP sensors to enter four-cylinder mode and deactivate cylinder 4.

What causes the P3425 code?

The P3425 code may be saved due to a number of causes, including:

  • Some restriction preventing the passage of oil.
  • Oil pressure that’s below normal levels.
  • A faulty or damaged cylinder deactivation solenoid.
  • A problem with the mechanical condition of the engine.
  • Poor electrical connection to the cylinder deactivation solenoid’s circuit.
  • An open or shorted cylinder deactivation solenoid harness.

What are the symptoms of the P3425 code?

In most cases, the only symptom of a P3425 code (or any code involving the deactivation of a cylinder) will be the illumination of the Check Engine Light. In some instances, though, you may notice that the engine vibrates more than usual when attempting to go into four-cylinder mode.

How does a mechanic diagnose the P3425 code?

The first thing involved with diagnosing a P3425 code is using an OBD-II scanner to read the code from the PCM. After reading the code and ensuring that no other codes have been stored, the mechanic will inspect the vehicle. If any other deactivation codes or other related codes have been stored, these should be resolved before moving on. After these are addressed, the mechanic will ensure that the oil pressure is correct and that the engine has the proper amount of oil.

Then the mechanic will clear all existing codes and test-drive the vehicle to ensure that they have been properly addressed. If the P3425 code is stored again, they will continue taking diagnostic steps to find the problem that’s causing the code to store and resolve it.

Common mistakes when diagnosing the P3425 code

If the engine’s oil passageways are restricted in any way, it can cause the P3425 code to be stored, and the solution will be simply to clean out the passageways and ensure that there is proper oil pressure in the engine. If this is the case, replacing or repairing other parts will not help resolve the problem or clear the code.

How serious is the P3425 code?

While this problem may not be life-threatening to your engine, it can wreak havoc on your fuel economy, as your vehicle will not be able to effectively transition into four-cylinder mode when operating under light conditions. If left unresolved for long enough, it may also have lasting negative effects on your engine, as well.

What repairs can fix the P3425 code?

Some of the most common fixes for a P3425 code include:

Additional comments for consideration regarding the P3425 code

Not only can it keep your vehicle from passing an OBD-II emissions test, but leaving a P3425 code and neglecting to resolve its underlying cause can create lasting damage for your vehicle.

Need help with a P3425 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

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...


Related questions

Q: Truck won't run like it used to

Hi, thanks for writing in. Believe it or not, this happens quite a bit when people swap OEM air filters to K&N or other products. It has nothing to do with the aftermarket part however. The P-0104 OBD-II error code...

Q: P0301 and P0411 codes on vw Passat 2003 1.8lt turbo

Fault code P0301 is a misfire on cylinder # 1 and P0411 is a fault for Incorrect Secondary Air Injection. Trouble code P0301 is most likely due to a faulty ignition coil. To verify before purchasing one, try swapping say...

Q: Tranny

The first thing that needs to be done is to scan the vehicle for all codes. Since the overdrive light is flashing, a simple code reader from your local parts store will not likely be of any help. Code readers...