Technical Description of OBD-II Trouble Code
Detected High Air Flow in Throttle Actuator Control System
What does that signify?
This generic powertrain diagnostic trouble code (DTC) is applicable to all OBD-II equipped vehicles that utilize a drive-by-wire throttle control system, including but not limited to vehicles from Dodge, Jeep, Chrysler, Volvo, Fiat, Mitsubishi, etc.
The P2173 OBD-II trouble code is one of several codes that indicate a malfunction in the operation of the Throttle Actuator Control System, as detected by the Powertrain Control Module (PCM).
These codes are set by the PCM when other codes are present that indicate a safety-related issue or potential damage to the engine or drivetrain components if not addressed promptly. P2173 and related codes (P2172, P2173, P2174, and P2175) all indicate problems with detected air flow.
Code P2173 is triggered by the PCM when high air flow is detected in the throttle actuator control system.
This code may be associated with a malfunction in the Throttle Actuator Control System, although it is possible that another issue is causing this code to be set. The PCM controls the duty cycle of the Throttle Actuator Control System, and its function is limited when other fault codes are detected.
Note: In certain Jeep/Dodge/Chrysler vehicles, this code may be referred to as “High Airflow/Vacuum Leak Detected (Slow Accumulation)”
Code Severity & Symptoms
The severity of this code can range from moderate to severe, depending on the specific malfunction. Symptoms of a P2173 trouble code may include:
Common Causes Of This DTC Code
Possible causes of the P2173 throttle engine code may include:
P2173 Diagnostic and Repair Procedures
The first step in troubleshooting any malfunction is to research the Technical Service Bulletins (TSB’s) specific to the vehicle’s year, model, and power plant. This can save a significant amount of time by providing guidance in the right direction.
For example, there is a bulletin (number 18-019-08) that applies to certain 2007-2008 Dodge and Jeep vehicles (Compass, Patriot, Caliber) and addresses this DTC and others. The recommended fix is to reprogram the PCM.
The second step for this code is to perform a PCM scan to identify any other trouble codes. This code serves as an informational code, and in most cases, it alerts the driver that the PCM has initiated a fail-safe mode due to a malfunction or failure in a system unrelated to the Throttle Control Actuator.
If other codes are identified, it is advisable to check for TSB’s related to the specific vehicle and code. If no TSB has been issued, the specific troubleshooting steps for that code should be followed to pinpoint the source of the detected malfunction and the reason for the engine being in fail-safe or limp mode.
Once all other codes have been cleared or if no other codes are detected, the PCM and Throttle Control Actuator should be evaluated. It is recommended to visually inspect all wiring and connections for any obvious defects as a starting point.
Common Mistake
Replacing the Throttle Control Actuator or PCM without addressing other malfunctions that are triggering this code.
Rare Repair
Replacing the Throttle Actuator Control
We hope that the information provided in this article has been helpful in guiding you towards resolving the issue with your Throttle Actuator Control System. However, please note that this article is purely informational, and the specific technical data and service bulletins for your vehicle should always take precedence.
