P3460 OBD-II Trouble Code: Cylinder 8 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 P3460 code

P3460 is a diagnostic trouble code (DTC) for "Cylinder 8 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 P3460 DIAGNOSTIC Get a fair and transparent estimate upfront

P3460 code definition

The P3460 code represents what’s known as Cyl8 Deactivation/Intake Valve Ctrl Circ Low. Cyl8 narrows the issue down to engine cylinder number 8. Other codes in the P3400 series may present concurrently with P3460, indicating a problem with another cylinder’s deactivation solenoid.

What the P3460 code means

V8 engines execute a process of deactivating four cylinders when operating under light load conditions, which helps maintain better fuel efficiency. The vehicle only operates on V8 mode during critical events, such as starting, idling, and medium to heavy operating conditions. This switch between modes is lightning fast and imperceptible to the driver. The mass airflow (MAF) sensor, MAP (manifold absolute pressure) sensor, and TP (throttle pressure) sensor are integral parts of the circuit in the cylinder deactivation process. When these sensors don’t send a signal to the ECM within the proper range, the deactivation process is affected and the vehicle will produce a P3400 code, or in the case of cylinder 8, a P3460.

What causes the P3460 code?

The network of components that work together in deactivating the cylinders means that the cause of the code could be the result of a number of issues:

  • Faulty MAP, MAF, or TP sensors
  • Malfunction in the valve lifters
  • Restricted oil pressure
  • Faulty connection in the cylinder deactivation solenoid circuit
  • A solenoid wiring harness short
  • Compromised fuel pressure
  • Mechanical condition of the engine
  • Rarely, a PCM (Powertrain Control Module) fault

What are the symptoms of the P3460 code?

The vehicle will only run in V8 mode, the engine may vibrate while running, and the Service Engine Soon or Check Engine light will likely illuminate.

How does a mechanic diagnose the P3460 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 P3460 code

Checking the oil passages for clogs is often overlooked. Checking the oil pressure helps determine whether debris and sludge may be an issue in the deactivation solenoid malfunction, and can help prevent replacing expensive, perfectly functional parts.

How serious is the P3460 code?

A vehicle storing this code may experience compromised fuel efficiency as well as engine vibration. The Check Engine light will likely come on and the vehicle will not be able to operate in V4 mode.

What repairs can fix the P3460 code?

The repair process for a Cylinder 8 deactivation malfunction will depend upon what is found in the diagnostic process, and could include the following:

Additional comments for consideration regarding the P3460 code

The cylinder deactivation process is complex, and involves a network of components each of which should be evaluated in determining the source of the malfunction. If a large amount of buildup is compromising the cylinders’ firing and deactivation processes, the entire engine may need to be taken apart and cleaned out. This is a major task best left to a professional technician. In addition, certain vehicle models may exhibit typical failures, so your mechanic will know what to look at first in that case.

Need help with a P3460 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
P3460
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P3460 code.

SCHEDULE P3460 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

5,606

Rating Summary
5,180
205
50
34
137
5,180
205
50
34
137

James

40 years of experience
34 reviews
James
40 years of experience
Ford F-150 - Check Engine Light is on - Chagrin Falls, Ohio
Jim was great! Arrived on time, quickly diagnosed the problem and recommended further work. Very helpful, I’ll use Jim again and recommend to family and friends.

Roberto

11 years of experience
137 reviews
Roberto
11 years of experience
Nissan Titan - Check Engine Light is on - Spring, Texas
Roberto was very thorough with his explanation of repairs needed. I will contact your mechanic for future repairs.

Matthew

32 years of experience
839 reviews
Matthew
32 years of experience
Kia Optima - Check Engine Light is on - Yorktown, Virginia
Matthew Lerman was God Sent, and thank God for Your Mechanic,, you have my Vote Looking , Looking forward for more Business. Very Honest Guy

Robert

20 years of experience
38 reviews
Robert
20 years of experience
Honda Accord - Check Engine Light is on - Brentwood, California
He came earlier than on time and got the job done faster than I seen anyone else have . Solid honest hard working dude.


More related articles

P0198 OBD-II Trouble Code: Engine Oil Temperature (EOT) Sensor High
P0198 P0198 code definition Engine Oil Temperature (EOT) Sensor High What the P0198 code means This code indicates there is higher voltage than expected in one or all of the circuits involving the EOT system (low oil engine temperature). What...
P0319 OBD-II Trouble Code: Rough Road Sensor B Signal Circuit
P0319 means the vehicle's crankshaft position changed due to defective, disconnected, or missing rough road sensors.
P0157 OBD-II Trouble Code: 02 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
P0157 code definition Oxygen Sensor Circuit Low Voltage (Bank 2 Sensor 2) What the P0157 code means The oxygen sensor that trouble...

Related questions

What would cause brand new O2 sensors to give codes 172, 173, 176, and 177, rich and lean conditions, both sides at the same time?

When it comes to across-the-board codes being set such as this, it is usually a result of something "upstream" creating the condition to set all these codes. For instance, it is rare for both O2 sensors to fail at exactly...

Hi, my engine light has started to flash and my car is shuddering and getting worse - especially when stationary. The engine light

Hello, thank you for writing in. The symptoms you are having can come from a range of different issues with the vehicle. There may be a sensor that is failing, low fuel pressure, a spark and ignition issue, or an...

P0420 code after idle relearn

Hi and thanks for contacting Your Mechanic. The P0420 code usually means that the catalytic converter has failed, however, it also relates to a mixture of fuel and air that is causing the catalytic converter to heat up too much....

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