P3450 OBD-II Trouble Code: Cylinder 7 Deactivation/Intake Valve Cotrol Performance

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P3450 code

P3450 is a diagnostic trouble code (DTC) for "Cylinder 7 Deactivation/Intake Valve Cotrol 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 for $99.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 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 $99.99 $20.0
Toyota $99.99 $20.0
BMW $109.99 $20.0
SCHEDULE P3450 DIAGNOSTIC Get a fair and transparent estimate upfront

P3450 code definition

The P3450 code is detected when the measurements from the MAP sensor, TP sensor or the MAF sensor are not within the range of the calculated values for cylinder deactivation mode.

This can be associated with OBD-II codes: P3401, P3402, P3403, P3404, P3409, P3410, P3411, P3412, P3417, P3418, P3419, P3420, P3425, P3426, P3427, P3428, P3433, P3434, P3435, P3436, P3441, P3442, P3443, P3444, P3449, P3450, P3451, P3452, P3457, P3458, P3459 and P3460.

What the P3450 code means

Fuel economy is managed by the ECM or engine control module. It will deactivate engine cylinders one through seven on the left bank of the engine and four through six on the right bank, transitioning into a V4 function. It will be able to return to its V8 functions when idling, starting or when using heavier throttling. The recording of the P3450 code means intake and exhaust valves may not open on required cylinders.

What causes the P3450 code?

There are several factors that can cause this code:

  • Low oil pressure
  • Impaired oil movement in the engine
  • Defective mechanical issues in the engine
  • Malfunctioning cylinder deactivation solenoid
  • Open or shorted cylinder deactivation solenoid harness
  • Poor electrical connection in the cylinder deactivation solenoid circuit

What are the symptoms of the P3450 code?

Typically, there are only a few signs from the P3450 code, with one being the service engine light illuminating and the other being performance issues. They ECM is able to usually manage switching between V8 and V4 operations in a matter of milliseconds, and a driver should never notice. With this code, the ECM may not sequence quickly, the valve lifter oil manifold solenoids may not energize quickly and the lifters may not deactivate within the two revolutions of the crankshaft.

How does a mechanic diagnose the P3450 code?

A P3450 is diagnosed using an OBD-II scanner, and the technician will first clear the codes and test to verify the information, including the use of the freeze frame data. They must also look at the order of multiple codes to rule out any other issues that may cause this problem.
They will then test the cylinder deactivation solenoid #7 to determine if it is working properly or if it has any debris. They will use a scanning tool for this, and also check oil passages to determine if the entire engine block is in need of disassembly and clearing of passages.

Common mistakes when diagnosing the P3450 code

A main issue is blocked oil passages and yet many mechanics may mistakenly overlook this simple test before they begin to tackle the repair. All oil passages must be scanned and cleared of debris or dirt as they reduce oil pressure and block the deactivation solenoid and their lifters from functioning properly and taking the engine from V8 to V4 function.

How serious is the P3450 code?

The P3450 code will not prevent the car from driving, but it will stop the vehicle from functioning on four cylinders for optimal efficiency during light driving. Though it is not considered a threat or risk to the vehicle, it does reduce fuel efficiency over the long run and put unneeded wear on specific cylinders.

What repairs can fix the P3450 code?

The repairs needed for the P3450 code can include:

  • Testing and replacing cylinder deactivation solenoid #7 if needed
  • Replacing lifters in the engine if needed
  • Cleaning the lifter oil passages and the cylinder deactivation solenoid oil passages of debris
  • Disassembling the entire engine should the passages be packed heavily with debris or oil sludge

Additional comments for consideration regarding the P3450 code

Because this code so often occurs with other codes of a similar nature, the repair can become extremely time consuming and costly. Taking apart the engine to properly clean the passages is a very in-depth (though not complicated) job, and something that should not be done without the fullest diagnostics beforehand.

Need help with a P3450 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
P3450

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P3450 code.

SCHEDULE P3450 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6529)

Rating Summary
6050
228
53
36
162
6050
228
53
36
162
 at YourMechanic

Kevin

24 years of experience
449 reviews
Kevin
24 years of experience
Toyota Camry L4-2.2L - Check Engine Light is on - Stone Mountain, Georgia
He is a very knowledgeable Mechanic, and told me where exactly to get my exhaust leak fix. Very honest and thorough Mechanic.
 at YourMechanic

Raymond

27 years of experience
144 reviews
Raymond
27 years of experience
Chevrolet Suburban 1500 - Check Engine Light is on - Apple Valley, California
Raymond is an excellent mechanic, I feel he is very honest and trustworthy. I would recommend him to everyone.
 at YourMechanic

Diana

18 years of experience
46 reviews
Diana
18 years of experience
Ford Escape V6-3.0L - Check Engine Light is on - Union, New Jersey
Fantastic service. Super knowledgeable and courteous. Something you don't get in the brick and mortar shops. A+++++++++
 at YourMechanic

Rusty

23 years of experience
462 reviews
Rusty
23 years of experience
Audi A4 L4-2.0L - Check Engine Light is on - Fort Worth, Texas
Rusty was knowledgeable, friendly, and helpful. He took the time to talk with me about my car and the various repair options I should consider. Highly recommended, and would use him again with high confidence.


More related articles

P2431 OBD-II Trouble Code: Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank 1
P2431 P2431 code definition Secondary Air Injection System Air Flow / Pressure Sensor Circuit Range / Performance Bank 1 What the P2431 code means The secondary air injection system is used to add air into the exhaust to reduce vehicle...
P0963 OBD-II Trouble Code: Pressure Control Solenoid A Control Circuit High
P9063 means there is an issue with the pressure control solenoid A control circuit due to low or dirty transmission fluid, faulty wiring or solenoid.
P0408 OBD-II Trouble Code: Exhaust Gas Recirculation Sensor B Circuit High
Trouble code P0408 means the PCM has detected an issue with the exhaust gas recirculation (EGR) system, often due to a faulty EGR temperature sensor.

Related questions

2 major issues

The code P0453 is for the purge control valve; it's most likely bad and needs to be replaced. The ticking noise is possibly the oil pressure dropping too low at idle and the camshaft followers are getting noisy. Have the...

The engine turned off on me while I was driving.

Hi there. The first thing that I recommend doing is check for any codes that the engine may have stored. The ECM may have the engine management system shut down for an issue with the traction control system malfunctioning. Perform...

My Check Engine Light came on 2 days after we replaced our battery

The Check Engine Light may or may not be related to the battery change on any late-model car like this one - even a simple operation like changing a battery is not so simple. There are a number of settings...

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