P3459 OBD-II Trouble Code: TP, MAP, or MAF Sensors

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

SCHEDULE P3459 DIAGNOSTIC Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of diagnosing the P3459 code

P3459 is a diagnostic trouble code (DTC) for "TP, MAP, or MAF Sensors". 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 P3459 DIAGNOSTIC Get a fair and transparent estimate upfront

Check Engine Light

P3459 code definition

The P349 code reflects that there is a problem with your vehicle’s TP, MAP, or MAF sensors.

What the P3459 code means

The control module in your vehicle is responsible for making sure that your ride is as safe, smooth and efficient as possible, even carrying out certain processes in service of this without letting you know.

One method of doing this is called cylinder deactivation mode. Basically, your vehicle is able to store a range of calculated values that would be enough to switch from V8 to V4 mode – again, without ever having to bother you.

The reason your vehicle does this is to increase fuel efficiency. Under light load conditions, your vehicle simply doesn’t need all eight cylinders – or all the gas they entail – to get the job done. So if the path ahead gets easier, special valve filters will stop intake and exhaust valves on certain cylinders from opening. All of this happens within milliseconds!

Unfortunately, sometimes, it should happen, but it doesn’t. When P3459 is stored, it’s because cylinders one and seven on the left bank and four and six on the right bank aren’t being shut down as they should, meaning your vehicle never enters V4 mode.

What causes the P3459 code?

There are actually a number of reasons that could contribute to the P3459 code being stored:

  • A defective cylinder deactivation solenoid
  • A cylinder deactivation solenoid harness is either open or shorted
  • A cylinder deactivation solenoid circuit has incurred a poor electrical connection
  • A problem with the engine’s mechanics
  • Low oil pressure
  • Something blocking the oil

What are the symptoms of the P3459 code?

There are really only a couple of symptoms that you may notice if your vehicle’s PCM has stored the P3459 code. First, you’ll probably see the Check Engine Light come on.

The other symptom you may take note of is that your vehicle’s fuel economy begins to suffer. This one is tough, though, because you may not use cylinder deactivation mode that much, meaning your fuel economy wouldn’t hurt by a lot either. However, by not being able to lay off extraneous cylinders, most of you will feel it at the pump a bit.

How does a mechanic diagnose the P3459 code?

A qualified mechanic will begin their diagnosis by using a scanner to confirm all the codes your PCM has stored. This will include the details regarding P3459. They’ll then inspect your vehicle’s cylinders and move onto the TP, MAF and MAF sensors. Your mechanic will also want to examine whether or not oil is able to transfer freely without issue.

Common mistakes when diagnosing the P3459 code

Again, one of the biggest mistakes with diagnosing the P3459 code is simply that it’s so easy to miss the problem in the first place. You may not even know it was a problem until you bring your vehicle in for some other reason.

This is why it’s a good idea to keep an eye on the MPG you generally get and take note if it begins changing unexpectedly. One possible explanation would be that your vehicle can’t shift to V4 mode when it would be prudent.

How serious is the P3459 code?

The problems related to the P3459 code definitely aren’t the kind that could damage your vehicle or put your life at risk. As we mentioned already, what it will do is end up costing you at the pump, so it’s probably worth having a professional fix it for you.

What repairs can fix the P3459 code?

Given that it’s a pretty simple problem, your mechanic shouldn’t have to do too much to fix it. They should only have to do one of the following:

Additional comments for consideration regarding the P3459 code

The problems that cause P3459 should serve as a good reminder to always take your vehicle to a qualified mechanic when you see the Check Engine light, even if it seems like nothing is wrong.

Need help with a P3459 code?

YourMechanic can have a certified mobile mechanic to your home or office right away if your vehicle is suffering. Just call us at 1-800-701-6230 or complete our online form here and you’ll receive a free quote with your appointment.

P3459
trouble codes
Check Engine Light

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

SCHEDULE P3459 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

3,936

Rating Summary
3,597
169
44
25
101
3,597
169
44
25
101

Peter

40 years of experience
1059 reviews
Peter
40 years of experience
Very happy with Peter. He didn't just go ahead with what was scheduled, when he noticed something else more serious. He did a thorough check engine light diagnosis and gave us a new estimate, showing me everything and explaining it so even I could understand. By doing this he saved us a bunch of money because the labor for today's job is included in the more serious job that is needed.
2005 CHEVROLET EQUINOX - CHECK ENGINE LIGHT IS ON - AVONDALE, ARIZONA

Jay

34 years of experience
566 reviews
Jay
34 years of experience
Very helpful and experienced.
2003 MITSUBISHI MONTERO - CHECK ENGINE LIGHT IS ON - REDLANDS, CALIFORNIA

Eric

12 years of experience
86 reviews
Eric
12 years of experience
Showed up on time and was extremely helpful
2006 TOYOTA HIGHLANDER - CHECK ENGINE LIGHT IS ON - WASHINGTON, DISTRICT OF COLUMBIA

Henry

31 years of experience
96 reviews
Henry
31 years of experience
Very Friendly and on time
2011 CHEVROLET MALIBU - CHECK ENGINE LIGHT IS ON - BLACKWOOD, NEW JERSEY

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...

Related questions

Q: Code is P02990 what does it mean?

Hello, thanks for writing in about your Buick Cascada. Trouble code P0990 is a transmission fluid pressure fault. Possibly an internal fault in the transmission or there is a fluid leak. If the car didn't make it home, I suggest...

Q: Car Not Starting - 2013 Dodge Charger

Hey there. I would start with testing your battery and alternator with a multi-meter. Good batteries hold a charge of 12.6 volts or higher. If the battery is low, try to jump start it. If this starts your vehicle, test...

Q: Stalls out when I put in drive p1729

Given your mileage, it is likely the throttle body and idle air controller need cleaning. It is also possible the throttle position sensor (which communicates with the transmission) may also be failing. This would seem more likely since your replacement...

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