P3492 OBD-II Trouble Code: Cylinder 12 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 P3492 code

P3492 is a diagnostic trouble code (DTC) for "Cylinder 12 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. 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 P3492 DIAGNOSTIC Get a fair and transparent estimate upfront

P3492 code definition

P3492 is the fault code for what’s known as Cyl12 Deactivation/Intake Valve Ctrl Circ High. Cyl12 specifies that the issue is likely taking place in engine cylinder number 12. In some Dodge vehicles, this code indicates a problem with Cylinder 11.

What the P3492 code means

During the early 2000s, automakers began instituting a technology that allows some engine cylinders to deactivate under light operating conditions in order to improve fuel economy, make the engine run smoother with less throttling, and decrease emissions. This is accomplished by the PCM detecting the driving conditions and disabling the fuel injectors to half of the cylinders. P3492 is typically found in diesel vehicles with larger engines, and indicates that engine cylinder 12’s deactivation process is malfunctioning in some way, causing the circuit values to send a signal outside of the normal range.

What causes the P3492 code?

This code may have a variety of possible causes, including one or more of the following:

  • A bad sensor, such as the manifold absolute pressure sensor (MAP) or mass airflow (MAF) sensor
  • Faulty valve lifters (also known as tappets)
  • Compromised oil pressure
  • A loose or faulty cylinder deactivation solenoid connection
  • Damage or a short in the solenoid wiring or harness
  • Fuel pressure problems
  • Mechanical problems in the engine
  • A faulty PCM (Powertrain Control Module), very rarely

What are the symptoms of the P3492 code?

The vehicle’s Check Engine light may illuminate, and fuel economy may be affected over time. In addition, the vehicle will likely only run in the higher modes, such as V12 rather than V6, and there could be an increase in emissions being released.

How does a mechanic diagnose the P3492 code?

Diagnostics typically begin with reading the vehicle’s stored codes using a scanner. These codes should then be cleared, and the vehicle retested to see which, if any, codes reappear. Once it’s determined that the code is consistently present, your technician will test the oil pressure and levels. If these are normal, the deactivation solenoid may be tested with a scan tool which is used to manually activate and deactivate the component. If the solenoid doesn’t work properly, oil passages may need to be cleared of sludge and buildup. However, if there are no issues with the deactivation solenoid’s function, and the oil passages are cleared, your technician may need to assess the valve lifters and wiring and other involved components to locate the source of the fault.

Common mistakes when diagnosing the P3492 code

Oil blockages are easy to overlook when trying to determine the cause of a faulty cylinder deactivation solenoid circuit. In addition, MAF sensors are a common source of issues in diesel engines and may trigger this code along with other problems.

How serious is the P3492 code?

While the vehicle will still run while throwing this code, it is still a fairly serious issue and should be addressed by a professional as quickly as possible. Fuel efficiency and emissions will be affected and the failure to be able to run in lower modes could have a negative effect on the engine over time.

What repairs can fix the P3492 code?

Repairing a cylinder 12 deactivation solenoid circuit problem may involve one of the following:

Additional comments for consideration regarding the P3492 code

If there is excessive dirt or sludge in the oil passages, the entire engine may need to be disassembled and thoroughly cleaned. This is a major task, and one that is done most efficiently and effectively by a professional. Keep in mind that even accessing the codes from a diesel engine can be a challenge – while a run-of-the-mill OBD-II scanner may be used in some vehicles, others may require a much more expensive version, along with costly computer software for reading the data.

Need help with a P3492 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.

trouble codes
P3492
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P3492 code.

SCHEDULE P3492 DIAGNOSTIC
Get a $20 credit for the follow-up repair

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

5,626

Rating Summary
5,199
206
50
34
137
5,199
206
50
34
137

Robert

11 years of experience
104 reviews
Robert
11 years of experience
Nissan Quest - Check Engine Light is on - Alexandria, Virginia
Punctual. Knowledgeable. Professional. Empathic, went the extra mile to explain in lay words the mechanical jargon. Excellent manners and customer service oriented. Client’s best interest and safety was always his top priority. From now on your company has in me a client for life. Thanks Robert!!!! 

Chris

21 years of experience
1861 reviews
Chris
21 years of experience
Mercedes-Benz E320 - Check Engine Light is on - Ladera Ranch, California
Chris was friendly, professional and knowledgeable. He got to the point of my concerns, explained what he was finding on his system and gave me his recommendations. I fully appreciate him taking the time to explain everything and a bit of history on my vehicle. Thanks again Chris.

Michael

15 years of experience
574 reviews
Michael
15 years of experience
Hyundai Accent - Check Engine Light is on - Marietta, Georgia
I had a great experience with Michael. He's extremely professional, friendly, and understands his craft. Highly recommended.

Chris

15 years of experience
274 reviews
Chris
15 years of experience
Dodge Durango - Check Engine Light is on - San Diego, California
Showed up early, was a friendly dude, kept me informed via text, did clean work and finished early. Would hire again.


More related articles

P0970 OBD-II Trouble Code: Pressure Control Solenoid “C” Control Circuit Low
P0970 means there is a discrepancy between the desired hydraulic pressure and the actual hydraulic pressure due to faulty solenoids.
P0888 OBD-II Trouble Code: Transmission Relay Sense Circuit (or Relay Output Always Off)
P0888 means a problem with the transmission control relay which may result in failure to switch gears and vehicle operating in "limp" mode.
P0675 OBD-II Trouble Code: Cylinder 5 Glow Plug Circuit
P0675 means that there is an issue in engine cylinder 5's glow plug circuit due to a problem directly related to the glow plug itself.

Related questions

Engine light on windshield wiper does not work

Hi there - check fuses for the windshield wiper issue, that is the most likely problem with that component. If the fuse is good, the switch is the next likely component issue. I would recommend having an electrical components are...

Check Engine code P0128

The cooling system temperature is regulated by thermostat, and the cooling fans order to keep it at optimal temperature for the motor to operate. It does this by keeping the thermostat closed and the fans off until the coolant reaches...

I have a 06 Infiniti M45. The service engine light came on. Got the codes of p0420 and p0430. Wondering if I need to replace both O2 sensors.

Hi there. When the codes P0420 and P0430 come up, usually the catalytic converter has failed, but before you determine if you need to replace the catalytic converter, consider checking the following: A damaged or failed oxygen sensor on...

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