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.

Check Engine Light
trouble codes
P3492

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

(6,328)

Rating Summary
5,857
225
52
35
159
5,857
225
52
35
159

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Toyota Corolla - Check Engine Light is on - New Braunfels, Texas
As always, punctual and professional. He explains the problem thoroughly. I feel confident in his work and knowledge.

Greg

22 years of experience
86 reviews
Greg
22 years of experience
Mazda 3 - Check Engine Light is on - Queen Creek, Arizona
Greg was scheduled for 1:00 but he was able to come earlier and let us know right away. He was very thorough and spent his time going thru the entire car.

Gustavo

17 years of experience
296 reviews
Gustavo
17 years of experience
Lincoln Aviator - Check Engine Light is on - San Antonio, Texas
Made call before appt. -courteous-knowledgeable-got part need & did prompt repair after computer check.

Claud

8 years of experience
325 reviews
Claud
8 years of experience
Chevrolet Trax - Check Engine Light is on - Grosse Pointe, Michigan
Very good experience. He arrived on time. Explained what he was going to do. Completed the work and was thorough in what I needed for my next service in plain language vs car jargon. I'm a raving fan of Claud!


More related articles

P2749 OBD-II Trouble Code: Intermediate Shaft Speed Sensor C Circuit
P2749 means a signal sent to the PCM was erratic, irrational or incorrect due to a defective valve, wiring issues, or faulty shift solenoids.
P2043 OBD-II Trouble Code: Reductant Temperature Sensor Circuit Range/Performance
P2043 P2043 code definition Reductant Temperature Sensor Circuit Range/Performance What the P2043 code means This code indicates that the powertrain control module has detected a malfunction with the reductant injector air pressure/temperature sensor. This sensor is used to reduce gases...
P0413 OBD-II Trouble Code: Secondary Air Injection System Switching Valve A Circuit Open
P0413 means theres a issue with the vehicle’s air injection system due to faulty air injection pump, faulty wiring or faulty air bypass solenoid.

Related questions

Engine light on. I have code p0013

Hi there. It is possible that the wrong oil was used or this can occur if a poor quality oil filter was installed. Most of the time though on this vehicle it is caused by a failure in one of...

Car won't start key turns and lights dim when it cranks. I just don't hear a buzzing sound from the fuel pump when turn key to on

Code U1100 signifies a communications error which is either a module fault or a deficiency in the wiring harness between communicating modules. There's a possibility that a dying battery is a cause of such a code (and a cause of...

Gas gauge not working properly.

I would have a technician check the codes on the computer. It may help find the problem your having. The gas gauge not working could be the sending unit in the tank or the wiring going to the gauge. I...

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