P3446 OBD-II Trouble Code: Cylinder 6 Exhaust Valve Control Performance

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P3446 code

P3446 is a diagnostic trouble code (DTC) for "Cylinder 6 Exhaust Valve Control Performance". 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 P3446 DIAGNOSTIC Get a fair and transparent estimate upfront

P3446 code definition

The P3446 code indicates that the PCM has detected a range of voltage values from the mass airflow sensor, the intake control manifold absolute pressure sensor, and the throttle position sensor, all within cylinder 6, that are not within the correct range, as compared to the manufacturer’s specifications. This code is very similar to the P3478 code, which represents the same issue within cylinder 10.

What the P3446 code means

In order to provide maximum fuel efficiency, certain cylinders are shut down during specific driving conditions. The PCM will instruct the cylinder deactivation solenoids to begin the process, which involves restricting the flow of oil to the valve lifts, which then stops the exhaust valve from opening. Using the data from the various sensors, the PCM can tell if the exhaust valve is operating normally. If the data does not match the specified voltage reading, the PCM will store the P3446 code.

What causes the P3446 code?

The P3446 code could be caused by any of the following:

  • Low oil pressure
  • Faulty throttle position sensor
  • Clogged oil passages
  • Faulty lifters
  • Faulty cylinder deactivation solenoid
  • Faulty mass airflow sensor, or faulty intake control manifold absolute pressure sensor
  • Faulty electrical components within the circuit, including wiring, harnesses, or connectors

What are the symptoms of the P3446 code?

In addition to the illuminated Check Engine Light, drivers may notice that the engine vibrates during operation.

How does a mechanic diagnose the P3446 code?

With this type of code, it is important to check the PCM for other stored codes, and to diagnose and repair those codes first. If after repairing any other codes within the PCM, the P3446 code is still reappearing, then the mechanic should check the engine oil pressure and oil levels. A visual inspection of all electrical components should follow, and any damaged elements should be repaired or replaced as necessary.

The code should be cleared from the PCM, and the system should be retested after each potential repair. The next step is to test the cylinder deactivation solenoid using a scan tool, and then to examine the oil passages for any debris that could be clogging them. Finally, the solenoid should be replaced if none of the other repairs have diagnosed the issue.

Common mistakes when diagnosing the P3446 code

The biggest mistake reported by technicians is forgetting to check the oil passages for clogs. This can cause a decrease in oil pressure, which prevents the cylinder deactivation solenoids from operating correctly. These passageways should always be checked and cleared if necessary.

How serious is the P3446 code?

This code represents an issue that should be repaired as soon as possible. If the P3446 code is ignored, it can lead to heavy damage to other areas of the engine, which can lead to expensive repairs in the future.

What repairs can fix the P3446 code?

In order to repair the P3446 code, a mechanic may attempt any of the following:

Need help with a P3446 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
P3446

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P3446 code.

SCHEDULE P3446 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

P0801 OBD-II Trouble Code: Reverse Inhibit Control Circuit Malfunction
P0801 means an issue with the reverse inhibitor switch making the vehicle unable to be placed in reverse or capable of doing so while driving forward.
P2510 OBD-II Trouble Code: ECM/PCM Power Relay Sense Circuit Range/Performance
P2510 P2510 trouble code definition ECM/PCM Power Relay Sense Circuit Range/Performance What the P2510 code means P2510 is an OBD-II generic code for the engine control module detecting the ignition relay is open or shorted causing the relay to not...
P0383 OBD-II Trouble Code: Glow Plug Control Module Control Circuit Low
Trouble code P0383 means the PCM has detected a low voltage reading of the glow plug heater circuit.

Related questions

MAF sensor

jeff engstrom

What sensor affects bank 2?

Code PO302 refers to a misfire. P1153 refers to the O2 sensor not switching often enough. This sensor monitors how often a lean to rich condition or rich to lean condition is present. When there is inconsistency in this, the...

Check Engine Light on again after thermostat replacement.

If the check engine light is coming on and a code like P1217 is in the computer then the computer is seeing an overheat conditions from the coolant sensor telling it your engine is overheating. This can be caused by...

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