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

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

SCHEDULE P2172 DIAGNOSTIC 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. 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 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 1-800-701-6220.

P2172
trouble codes
Check Engine Light

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

SCHEDULE P2172 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

4.8/5

Number of Reviews

4,810

Rating Summary
4,424
187
47
28
124
4,424
187
47
28
124

Joel

19 years of experience
741 reviews
Joel
19 years of experience
Acura RL - Check Engine Light is on - Jacksonville, Florida
very knowledgeable and precise. able to fix electrical issues in my car. Right on time for the appointment.

Christopher

15 years of experience
41 reviews
Christopher
15 years of experience
Honda Accord - Check Engine Light is on - Fairburn, Georgia
Christopher was excellent! He explained everything in detail to make sure I understood. He was professional and provided me with the next course of actions to resolve my care issues. I'm glad he was sent to service my car.

Alexander

18 years of experience
58 reviews
Alexander
18 years of experience
Saab 9-7x - Check Engine Light is on - Kissimmee, Florida
He was very friendly and very helpful . I felt like it was being around a close friend , also gave me so very good advice on my car & future advice about it . Highly recommend mechanic, would use his services again .

Matthew

31 years of experience
639 reviews
Matthew
31 years of experience
Jeep Patriot - Check Engine Light is on - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

More related articles

P2184 OBD-II Trouble Code: Engine Coolant Temperature Sensor 2 Circuit Low
P2184 P2184 code definition P2184 is an OBD-II generic code for the engine control module (ECM) detecting the engine coolant temperature sensor (ECT) #2 is indicating low range and does not correlate with ECT sensor #1. What causes the...
P0409 OBD-II Trouble Code: Exhaust Gas Recirculation Sensor "A" Circuit
P0409 P0409 code definition P0409 is a generic OBD2 diagnostic trouble code pointing to an issue with the exhaust gas recirculation circuit. This code may be seen with other EGR codes. What the P0409 code means The P0409 code is...
C1104 OBD-II Trouble Code: Traction Control Active Lamp - Circuit Short to Battery
Trouble code C1104 means the Engine Control Unit (ECU) has registered a short circuit issue in the traction control lamp.

Related questions

Camshaft timer is off.

You will want to have the fault codes read out of the engine computer to see where the fault lies. P0011, P0016, and P0017 all have to do with the camshaft actuator. These faults are saying the camshaft position does...

the car wont pass emmissions the code po420 comes up

Fault code P0420 indicates the catalytic converter is operating below proper efficiency. There are two oxygen (O2) sensors in the exhaust system. One just before and one just after the catalytic converter. The ecu reads the first O2 sensor to...

Check Engine Light blinking fast

You most likely have an engine misfire. The cause could be an ignition coil, spark plug, or plug boot problem, such as the valve cover leaking oil into the spark plug hole, shorting the coil out. I recommend that you...

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