P2172 OBD-II Trouble Code: Throttle Actuator Control System - Sudden High Airflow Detected

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

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2172 code

P2172 is a diagnostic trouble code (DTC) for "Throttle Actuator Control System - Sudden High Airflow Detected". 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 $114.99 . 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 $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P2172 DIAGNOSTIC Get a fair and transparent estimate upfront

P2172 code definition

Throttle Actuator Control System - Sudden High Airflow Detected

What the P2172 code means

The P2172 code means that a large amount of airflow was suddenly inducted into the throttle actuator control system. The electronic control unit (ECU) detects this large amount of air and the P2172 diagnostic trouble code (DTC) is set. When the code is set, the Check Engine Light will be illuminated on the dashboard. When the code is set, the ECU will enable a failsafe mode to prevent any further damage. The failsafe mode will remain until the code is repaired or normal operation is detected.

What causes the P2172 code?

  • Stuck-open throttle plate
  • Manifold absolute pressure (MAP) sensor failure
  • Failed throttle body
  • Vacuum leak
  • Open or short in the wiring harness

What are the symptoms of the P2172 code?

How does a mechanic diagnose the P2172 code?

  • Qualified technicians will check for any codes stored in the vehicle's ECU first. These codes may include pending and history codes.

  • The freeze frame data found with any codes will also be stored in the ECU and will be noted.

  • Then all codes will be cleared and a test drive performed.

  • After the test drive, a visual inspection will be performed to look for any obvious faults.

  • The technician will use a multimeter to check for proper voltage at the MAP sensor.

  • Then the scan tool will be used to check the datastream and look at the fuel trims for a sign of a vacuum leak.

  • If a vacuum leak is suspected the intake system will be checked for vacuum leaks.

  • Lastly, the technician will remove the intake tube and inspect the throttle body and make sure it can operate.

Common mistakes when diagnosing the P2172 code

WIth many different systems having the potential to cause the P2172 code, it is easy for mistakes to be made. The most common mistake is confusing MAP sensor failure with a vacuum leak as they can have similar symptoms.

How serious is the P2172 code?

The P2172 code may prevent the vehicle from operating at all. This code has the potential to have no throttle response or not start at all. In cases where these occur, the vehicle should not be driven at all until repairs are made as it is not safe.

What repairs can fix the P2172 code?

  • Replacing the throttle body
  • Replacing the MAP sensor
  • Repairing a vacuum leak
  • Resolving an open or short in the wiring harness
  • Getting a sticking throttle body unstuck

Additional comments for consideration regarding the P2172 code

In some cases the throttle plate may be stuck open causing the P2172 code. If the throttle plate is stuck open there are usually 2 causes:

  1. mechanical failure
  2. carbon buildup that prevents the throttle from closing

The carbon buildup can be removed using throttle body cleaners to carefully dissolve the carbon and free up the throttle plate movement. Most of the time, the throttle is attempted to be cleaned before it is replaced as this is a much cheaper option.

Need help with a P2172 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
P2172

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2172 code.

SCHEDULE P2172 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7294)

Rating Summary
6779
246
57
39
173
6779
246
57
39
173
 at YourMechanic

Simon

30 years of experience
8 reviews
Simon
30 years of experience
Honda Element L4-2.4L - Check Engine Light is on Inspection - Albuquerque, New Mexico
Simon was Professional, knowledgeable and patient throughout the entire process. Would highly recommend!
 at YourMechanic

Luke

17 years of experience
134 reviews
Luke
17 years of experience
Chevrolet Equinox L4-2.4L - Check Engine Light is on - Austin, Texas
Luke was friendly and professional. He did a nice job of explaining the issue with my car so that I could understand it.
 at YourMechanic

Chuy

14 years of experience
386 reviews
Chuy
14 years of experience
Toyota Camry L4-2.5L - Check Engine Light is on - Chicago, Illinois
His explained everything very clearly on what I should do next with my car and what the cheapest solutions were.
 at YourMechanic

Jose

12 years of experience
31 reviews
Jose
12 years of experience
Chrysler Pacifica V6-3.8L - Check Engine Light is on - Redlands, California
Very friendly and punctual. Knows what he is talking about. Appreciate Jose working on my car. I would recommend him to customers.


Related questions

My car stalls with weather under 40' or moist out.

Hi there. There could be two things that are contributing to your issues with the vehicle that are playing a big roll in this. First check the manifold absolute pressure sensor (MAP (https://www.yourmechanic.com/services/manifold-absolute-pressure-sensor-map-sensor-replacement)) on the engine. Check to see if...

More related articles

P2438 OBD-II Trouble Code: Secondary Air Injection System Air Flow/Press Sensor Circuit High Bank 2
P2438 P2438 code definition A P2438 trouble code means that the PCM has detected a problem within the secondary air injection system. Another component that can cause a P2438 code to be stored is a problem with the pressure sensor...
P2315 OBD-II Trouble Code: Ignition Coil F Primary Control Circuit Low
P2315 P2315 code definition The P2315 diagnostic trouble code is an indication that there is a problem with the ignition coil F primary control circuit. Related Trouble Codes: P2300 OBD-II Trouble Code: Ignition Coil A Primary Control Circuit Low P2301...
P002A OBD-II Trouble Code: "B" Camshaft Profile Control Circuit/Open
Diagnostic Diagnostic Trouble Code (DTC): P002A What the P002A code means Engines operate by way of a system of moving parts that open the intake valves (for allowing gas into the cylinders) and exhaust valves (which carry the vapors away)....

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