P3466 OBD-II Trouble Code: Cylinder 9 Deactivation/Intake Valve Malfunction

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P3466 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P3466 code

P3466 is a diagnostic trouble code (DTC) for "Cylinder 9 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 $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P3466 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P3466 code definition

P3466 is code for Cyl9 Deactivation/Intake Valve Ctrl Perf. Cyl9 narrows the issue down to engine cylinder number 9, while “Perf” indicates a performance problem. Other P3400 series codes may also be present, alerting you to an issue with another cylinder.

What the P3466 code means

In order to maximize fuel economy, protect the engine from undue stress, and reduce emissions, most late model vehicles with more eight or more cylinders feature a deactivation process that turns off half of the cylinders when the vehicle is operating under light load conditions. This happens by way of the MAF (mass airflow), MAP (manifold absolute pressure), and TP (throttle pressure) sensors telling the ECM to turn off the fuel injectors to certain cylinders. When cylinder 9 fails to deactivate, the intake valve which provides fuel to the engine doesn’t shut down the way it’s supposed to. The ECM receives a message about this failure and kicks out the P3466 code.

What causes the P3466 code?

The causes of this code range from minor malfunctions to major issues, and may include:

  • A bad sensor, such as the mass airflow sensor or manifold absolute pressure sensor
  • A bad deactivation solenoid
  • A short in the wiring or harness
  • Poor fuel pressure
  • A valve lifter malfunction
  • Low oil pressure
  • A loose deactivation solenoid connection
  • A mechanical problem in the engine

Very rarely, a faulty PCM may be to blame; however, this is rarely the cause of a deactivation fault.

What are the symptoms of the P3466 code?

When a cylinder doesn’t deactivate as it should, the ECM will shut off the cylinder, which may cause misfires and/or vibrations when the vehicle is running. The Service Engine Soon light may come on as well.

How does a mechanic diagnose the P3466 code?

The mechanic will make sure the vehicle has proper oil levels and pressure, followed by verifying the Diagnostic Trouble Codes using a scanner, assessing and diagnosing any other codes that are stored in the powertrain control module at the same time. The codes should then be cleared from the scanner. The mechanic will then test the cylinder deactivation solenoid using a scan tool. If the solenoid is malfunctioning, the oil passages will be checked and cleared of debris and other obstructions. If your technician determines that the solenoid is functioning and there are no oil blockages, the valve lifters may be the source of the problem.

Common mistakes when diagnosing the P3466 code

Replacing parts without following the entire recommended diagnostic procedure can result in costly repairs without solving the problem. The oil passageways can easily be overlooked when diagnosing this code – these should always be checked for any possible obstruction.

How serious is the P3466 code?

Any time you get a code related to the deactivation system, particularly if your vehicle is exhibiting observable symptoms, you should have it diagnosed and repaired as soon as possible. While the vehicle will likely still run, the engine won’t function as it’s supposed to, which can cause damage in the future.

What repairs can fix the P3466 code?

Fixing a deactivation solenoid performance problem may include:

Additional comments for consideration regarding the P3466 code

The process of narrowing down exactly what’s causing a deactivation control malfunction can be painstaking, and requires specialized tools like a scanner that can give additional information about the fault. In addition, if the entire engine must be taken apart to clean the oil passageways, this is a major undertaking that requires a high level of automotive knowledge. It is always best to consult a professional if you have doubts about attempting this repair on your own.

Need help with a P3466 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
Check Engine Light
P3466

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P3466 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,696

Rating Summary
3,372
162
42
24
96
3,372
162
42
24
96

Peter

40 years of experience
1059 reviews
Peter
40 years of experience
Very professional. Very informative. Great guy.
2011 JEEP COMPASS - CHECK ENGINE LIGHT IS ON - GLENDALE, ARIZONA

Abdul

8 years of experience
279 reviews
Abdul
8 years of experience
After using a local mechanic and DIY techniques to pass emission inspection, I turned to yourmechanic.com again. Abdul came to my home and inspected my vehicle. Within an hour, he inspected and performed major repair. He tested his work to confirm accuracy, and he cleaned up any debris. Great job! I am still grateful for this service and the professional, knowledgeable mechanics.
2007 TOYOTA CAMRY - CHECK ENGINE LIGHT IS ON - SMYRNA, GEORGIA

Peter

33 years of experience
346 reviews
Peter
33 years of experience
Very professional and honest.
1999 NISSAN PATHFINDER - CHECK ENGINE LIGHT IS ON - CHULA VISTA, CALIFORNIA

Duane

22 years of experience
323 reviews
Duane
22 years of experience
Great and knowledgeable!
2009 AUDI TT QUATTRO - CHECK ENGINE LIGHT IS ON - LAKESIDE, CALIFORNIA

More related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...
P0291OBD-II Trouble Code: Cylinder 11 Injector Circuit Low
P0291 code definition When your vehicle’s PCM registers the P0291 code, it means that a voltage reading came from the fuel injector circuit – for cylinder number 11’s fuel injector –...

Related questions

Q: power shuts down,but will run and drive very slow

For issues like this you should have the system computer scanned and have any codes diagnosed by a mechanic. The cost to have the problem properly diagnosed far out weighs throwing parts at the problem hoping to fix it. The...

Q: Q: bad o2 sensors

Diagnostic Trouble Codes can never be used to "directly" condemn parts. In the case of an oxygen sensor, the oxygen sensor output must be evaluated on a scope to determine if the sensor itself is bad or if you perhaps...

Q: The code read P0341, how do I know if it's the chain or the cam sensor?

There is a technical service bulletin for the Acura TSX stating that the code may be caused from the timing chain getting stretched until the tensioner cannot keep it tight any longer. This is a result of not getting oil...

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.

1-800-701-6230 · hi@yourmechanic.com