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Also, here is a little
I can also take a video of what it's doing on my lunch and post it.
Yep;

Here is a little more info on DTC P-2172;

P2172 - High Airflow / Vacuum Leak Detected (instantaneous Accumulation)

P2172 Throttle Actuator Control System - Sudden High Air Flow Detected (obd-codes.com)

P2172 Throttle Actuator Control System - Sudden High Air Flow Detected OBD-II Trouble Code Technical Description Throttle Actuator Control System - Sudden High Air Flow Detected What does that mean?

This generic powertrain diagnostic trouble code (DTC) typically applies to all OBD-II equipped vehicles that use a drive-by-wire throttle control system including but not limited to vehicles from Dodge, Jeep, Chrysler, Volvo, Fiat, Mitsubishi, etc.

The P2172 OBD-II trouble code is one of a number of possible codes, that indicates that the Powertrain Control Module (PCM) has detected a malfunction in the operation of the Throttle Actuator Control System.

The PCM sets these when other codes are present that indicate an issue that may be safety related or cause damage to the engine or drivetrain components if not corrected in a timely manner.

This and related codes (P2172, P2173, P2174, and P2175) all indicate detected air flow problems.

Code P2172 is set by the PCM when sudden high air flow is detected in the throttle actuator control system. This code can be related to a Throttle Actuator Control System malfunction, but it is possible that another issue is setting this code.

The Throttle Actuator Control System is duty cycle controlled by the PCM and the function of the system is limited when other fault codes are detected.


Note: In the case of certain Dodge/Chrysler vehicles, this code may be described as "High Airflow/Vacuum Leak Detected" Code Severity & Symptoms The severity of this code can be moderate to severe based on the specific malfunction.

Symptoms of a P2172 trouble code may include: Malfunction Indicator Lamp (MIL) illumination Engine may not start Either no or low throttle response Automatic transmission will not shift Additional codes are possibly set Common Causes Of This DTC Code

Potential causes of the P2172 throttle engine code may include: Vacuum Leaks (most likely) Manifold Absolute Pressure Malfunction Abnormal System Voltages

P2172 Diagnostic and Repair Procedures

The first step in the troubleshooting process for any malfunction is to research the Technical Service Bulletins (TSB's) for the specific vehicle by year, model and power plant. In some circumstances this can save a lot of time in the long run by pointing you in the right direction.

For example, we are aware of a bulletin that applies to 2013-2015 Dodge Dart and Chrysler 200 cars, bulletin number 18-006-15 which involves this DTC and others, and the fix is to reprogram the PCM.

The second step for this code is to complete a PCM scan to identify other trouble codes. This code is an informational code and in most circumstances this code's function is to alert a driver that the PCM has initiated a fail-safe mode because of a malfunction or failure in a system that is not directly related to the Throttle Control Actuator
.

If other codes are identified, you should check for TSB's related to the specific vehicle and that code. If a TSB has not been generated you should follow the specific troubleshooting steps for that code to pinpoint the source of the malfunction that the PCM is detecting to put the engine in fail-safe or limp mode.

Once all other codes have been cleared or if no other codes are detected, if the Throttle Control Actuator code still exists the PCM and Throttle Control Actuator should be evaluated.

All wiring and connections should be visually inspected for obvious defects as a starting point.

Also, check MAP sensor circuitry. Common Mistake Replacing the Throttle Control Actuator or PCM when other malfunctions are setting this code. Rare Repair Replace Throttle Actuator Control Hopefully, the information in this article has been helpful to point you in the right direction to correct the problem with your Throttle Actuator Control System force code.

This article is strictly informational and the specific technical data and service bulletins for your vehicle should always take priority. Related DTC Discussions Register now to ask a question (free) There are currently no related topics in our forums. Post a new forum topic now. Need more help with a P2172 code?

If you still need help regarding the P2172 trouble code, please post your question in our FREE car repair forums.

Read more at: P2172 Throttle Actuator Control System - Sudden High Air Flow Detected
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You know just for kicks, you could completely disconnect your battery for 30 minutes & then reconnect it @msnowdon ;

This will perform a hard reset of the PCM and see if that changes your symptoms at all.

Another easy & cost-free, trouble-shooting step;
 

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Discussion Starter · #23 ·
You know just for kicks, you could completely disconnect your battery for 30 minutes & then reconnect it @msnowdon ;

This will perform a hard reset of the PCM and see if that changes your symptoms at all.

Another easy & cost-free, trouble-shooting step;
I have done that because while working on it I had my battery disconnected the whole time.
 

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I have done that because while working on it I had my battery disconnected the whole time.
You could try unplugging all of the plugs/connections going into the PCM and re-seating them and make sure they are good, clean connections, that are making good contact.
 

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Done that too
From my DTC P-2172 Trouble Code post, a couple of posts earlier;

Once all other codes have been cleared or if no other codes are detected, if the Throttle Control Actuator code still exists the PCM and Throttle Control Actuator should be evaluated.

All wiring and connections should be visually inspected for obvious defects as a starting point.

For example, we are aware of a bulletin that applies to 2013-2015 Dodge Dart and Chrysler 200 cars, bulletin number 18-006-15 which involves this DTC and others, and the fix is to reprogram the PCM.

@msnowdon ;

Something else you have to consider, there is a possibility that your PCM was damaged, when your XK overheated.

I'm not saying that IS the problem, but, it is a realistic possibility.
 

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Discussion Starter · #28 ·
I wish I knew how badly it overheated. My wife was driving it at the time. I made it clear to her to shut it off if it the temp gauge started going past the middle. Anyway I was able to take a video during my lunch. It actually ran a little longer than usual. Here is the link:

 

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I wish I knew how badly it overheated. My wife was driving it at the time. I made it clear to her to shut it off if it the temp gauge started going past the middle. Anyway I was able to take a video during my lunch. It actually ran a little longer than usual. Here is the link:

Yeah, that sounds terrible;

On a positive note, at least you know the motor isn't seized, so, that's good.

Have you located & looked at the Throttle Control Actuator at all?
 

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Discussion Starter · #30 ·
Yeah, that sounds terrible;

On a positive note, at least you know the motor isn't seized, so, that's good.

Have you located & looked at the Throttle Control Actuator at all?
No. I'll have to find out where that is located. I removed the whole throttle body off the vehicle for cleaning. Is it in the electrical box attached to the body?
 

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No. I'll have to find out where that is located. I removed the whole throttle body off the vehicle for cleaning. Is it in the electrical box attached to the body?
I honestly don't know; Let me do little research and see what i can dig up.
 

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No. I'll have to find out where that is located. I removed the whole throttle body off the vehicle for cleaning. Is it in the electrical box attached to the body?
So, I found this;

Engineering Font Machine Auto part Science


It appears that the Throttle Actuator Control is the actual electric motor, within the throttle body;

Maybe you should consider replacing the throttle body.....
 

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Discussion Starter · #33 ·
The information you posted regarding the P2172 code mentions the PCM initiating a fail-safe mode because of a malfunction or failure in a system that is not directly related to the Throttle Control Actuator. That would make sense because I know it did overheat. Its the Jeep's method of preventing engine damage. This was also mentioned in another post which I referenced at the start of this post. Question is, ow do I get it out of fail-safe ( limp mode )?

It does sound like it has an exhaust leak at the back of the engine. Maybe it blew out an O2 sensor.
 

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make sure you fill it from the small allen keyed neck on top of the motor, not the radiator, run it for a bit with that open and keep filling it there. that should get rid of air bubbles. then i would disconnect the battery for 30 min and let the PCM reset it self. hoping these low buck things fix it. if you replace a sensor, get the mopar unit. too many of the cheap ones failing and making us think its something else.
Have you filled the system up like this personally?

The allen plug is a vent that lets the air out while you are filling the system. You fill untill fluid is coming out of the hole.

I dont think it's made to fill from the side?
 

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yes, i stuck a funnel in that 'port' and filled the system, then ran it until the thermostat opened and continued to fill it. have not had any issues in a 1,000 miles (not temp related anyway)

it is the "highest" point in the cooling system.
 
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I have done that because while working on it I had my battery disconnected the whole time.
@msnowdon ;

That absolutely is not the correct procedure when performing a hard reset of the PCM.

The hard reset of the PCM needs to be done AFTER the install of the new components has been completed & AFTER you have started and run the engine, with the new components installed.

In the end, it may not make a difference, but, that's the proper way to go about it.

What you did is not the same thing.
 
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