Skip the auto shop - Our mechanics make house calls

P2170 OBD-II Trouble Code: Exhaust Press Regulator Vent Solenoid Control Circuit Low

check engine light

What the P2170 code means

Your vehicle’s control module detects that the measured values from the MAP sensor, MAF sensor, and TP sensor are not within the range of the calculated values for cylinder deactivation mode.

What causes the P2170 code?

There are a few causes for the P2170 code. The common cause is a defective throttle position actuator, throttle position sensor, throttle actuator control motor, or pedal position sensor. Other causes may include corroded, shorted or open wiring or connectors in the throttle actuator motor or CAN Bus harness, and a broken ground wire or a loose control module ground strap.

What are the symptoms of the P2170 code?

You may notice black smoke when you start your vehicle, poor or no acceleration, misfiring when your vehicle is idle, a no start condition, or your vehicle may stall while you are driving.

How does a mechanic diagnose the P2170 code?

First, a mechanic will scan and document the codes in your vehicle’s ECM. He or she will then diagnose the problem according to the manufacturer’s pinpoint test, which prevents injury from the throttle plates shutting on your fingers. Next the mechanic will clear the ECM code P2170 and then test to see whether the code reappears. He or she will then monitor the throttle position sensors one and two when the accelerator is depressed. He or she will do this in order to see if the TACM moves within the correct parameters. He or she will then test and confirm if the connector and wiring to the TACM are in good working order. Make sure that, if you are doing this yourself, you begin with a thorough visual inspection and make notes of what you see. Also be sure to always retest the system after you complete your repairs to make sure that the code does not reappear.

Common mistakes when diagnosing the P2170 code

Common mistakes when diagnosing the P2170 code include clearing ECM memory codes before you check the freeze frame data. Always check the freeze frame data first, and work in the order that the codes appear. Another common mistake is moving the throttle plates by hand, which will cause other codes to appear in your vehicle’s memory. Also, make sure that you clear all ECM codes after the 2170 codes are fixed.

How serious is a P2170

A P2170 is very serious and, in most instances, should be handled by a professional technician. If this code appears, you will not be able to drive your vehicle. And not only is a P2170 a serious problem, but it is also difficult to fix, requiring that you have particular diagnostic equipment. If you do not have this equipment, your best bet may be to consult a professional technician and have him or her solve the issue for you.

What repairs can fix the P2170 code?

The most common repairs for this code are replacing the throttle actuator assembly and repairing the wiring or connection to the actuator assembly. It may also be necessary for you to replace the entire throttle body, which usually includes the throttle position sensor and the actuator motor. In addition, you may need to replace your pedal sensor. Be sure to consult your vehicle service manual for your manufacturer’s recommendations.

Additional comments for consideration regarding the P2170 code

A P2170 can become complicated and may require that you dissemble your vehicle’s engine, which is time consuming and complicated if you do not have the proper training. Doing this on your own may involve probing thousands of circuits independently to discover the exact malfunction. Therefore, it is important to do the correct amount of research before you begin to work. If you are wanting to do this yourself, you should probably contact a professional technician to ask questions about the best way to solve your problem.

Need help with a P2170 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 at (https://www.yourmechanic.com) or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

How Long Does a Throttle Return Spring Last?
Not all vehicles on the road feature an electronic throttle control (ETC), which is also called drive-by-wire. For vehicles that don't offer this system, they have a throttle cable instead that...
P0121 OBD-II Trouble Code: TPS "A" Circuit Range Performance Problem
P0121 code definition Throttle Pedal Position Sensor/Switch (TPS) A Circuit Range Performance Problem...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...


Related questions

Q: Engine problems.

Hello. From what you describe it would appear likely that the backfiring and performance issues are a result of the fuel problem. A rich fuel mixture can be caused by a wide variety of issues. A few things I would...

Q: Service engine soon light is on can not get it off how do I turn it off

To get the check engine light off you will need to get a check engine light inspection having a mechanic like one from YourMechanic come to you and scan the computer. Once the codes are diagnosed then the mechanic can...

Q: The Check Engine Light came on, I hooked it up to my scanner and got the code P0308 (cylinder #8 misfire).

An easy way to isolate if the ignition coil is the problem is to swap the #8 coil with another cylinder. Swap the #8 coil with the coil from the adjacent cylinder, then clear the codes. If the code remains...