What Is the P2173 Code?
Symptoms
Causes
Seriousness
Can I Still Drive?
Diagnose
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The P2173 code is a generic powertrain code that indicates a problem in the throttle actuator control system. In particular, it means the Engine Control Module (ECM) is detecting more air entering the intake manifold than the corresponding throttle position. The code, just like most OBD-II error codes, may be caused by a variety of factors, including a faulty throttle body, a vacuum leak, or a damaged actuator.
More About Error Code P2173
The throttle actuator control system is responsible for controlling the opening and closing of the throttle plates in the intake manifold. The throttle plates regulate the amount of air that enters the engine, which is necessary for proper engine operation.
Error code P2173 is typically triggered when the amount of air flowing into the engine exceeds the desired limits set by the manufacturer. When this happens, the throttle actuator is unable to control the airflow and maintain proper engine function.
The P2173 code is not the only error code linked to the throttle actuator control system. There are additional error codes that especially relate to the throttle position sensor and the electronic throttle control system. These include:
- P2111 – Throttle Actuator Control System – Stuck Open
- P2112 – Throttle Actuator Control System – Stuck Closed
- P0120 – Throttle/Pedal Position Sensor/Switch A Circuit
- P0121 – Throttle/Pedal Position Sensor/Switch A Circuit Range/Performance Problem
- P2135 – Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
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What Are the Symptoms of a P2173 Code?
When your car has an active P2173 fault code, it may exhibit the following symptoms:
- Lack of throttle response
- Engine hesitation
- Engine idling
- Engine power loss
- Annoying check engine light
What Are Some Causes of a P2173 Code?
A P2173 trouble code may be triggered by any of the following issues:
- Vacuum leaks
- Faulty throttle body
- ECM or PCM malfunction
- Malfunctioning accelerator pedal position sensor
- Defective throttle position sensor
- Brake vacuum implausible signal
- Assembly failure or component malfunction
- Circuit resistance or issues with electrical components
- Throttle Actuator Control System (TACS) circuit malfunction
- Abnormal system voltages: For example, if the voltage supplied to the throttle actuator is too low or too high, it can cause the actuator to open or close too much. This can lead to irregular airflow to the engine and subsequently trigger the error code.
- Wiring harness issues: Faulty or bad wiring of harnesses between the throttle body and engine control module can cause the code to appear.
How Serious Is the P2173 Code?
Diagnostic trouble code P2173 is triggered when the airflow into the engine is implausibly high, which essentially makes it a relatively serious code.
As such, the code can lead to various engine problems, such as engine hesitation, lack of throttle response, engine power message, as well as driveability issues like low engine power mode, and poor fuel mileage.
Can I Still Drive with a P2173 Code?
No. It is not advisable to continue driving with the P2173 code as it can lead to engine failure. Usually, engine failure causes problems with certain drivetrain components, such as the timing belt, valves, or water pump. The error code can also lead to failed emissions tests.
How Easy Is It to Diagnose a P2173 Code?
Diagnosing a P2173 code is fairly easy, as it only requires an OBD-II scanner and a visual inspection of the throttle actuator control system.
However, the risk of misdiagnosis is very high if you’re not a seasoned technician, which is why we recommend seeking advice from expert mechanics first.
The following are some of the steps that a professional mechanic will go through to identify the cause of the problem:
- Check for any obvious defects in the throttle actuator control system, such as a disconnected vacuum hose or damage in the wiring harness.
- Use the OBD-II scanner to check for all the active error codes.
- Check the throttle body connector and throttle body mechanism for any signs of damage or wear.
- Test the throttle position sensor and accelerator pedal position sensor using a multimeter to ensure they are functioning properly and sending the correct signals to the engine control module.
- Check the duty cycle of the throttle control actuator to ensure it is operating within its specified range.
- Inspect the electronic throttle control system actuator and its circuits to see if they’re performing properly.
- Inspect the auxiliary emission controls, EGR valve, and PCV valve to ensure that they are not malfunctioning.
- Test the air metering and fuel delivery systems for any issues that may be causing the P2173 code.
- Perform a road test to verify the diagnosis and ensure that the issue has been resolved.
How Difficult Is It to Inspect a P2173 Code?
Inspecting and repairing the P2173 code can be a complex process that requires the use of specialized diagnostic equipment and good technical expertise. The average cost of inspection largely depends on how hard it is to diagnose the problem, and the number of parts affected.
Since it affects parts that are very close to the engine, and potentially the engine itself, the average auto repair labor rates can exceed several thousand dollars. Nonetheless, you should not attempt to repair the damages yourself as it could lead to more damage.
Need Additional Help with Your P2173 Code?
It’s common for error code P2173 to appear in most OBD-II-equipped vehicles, including popular models like Jeep Compass, Patriot, and Caliber. The good news is you can use KBB.com to find a reliable service center in your neighborhood and have your vehicle fixed.
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