Technical Description of OBD-II Trouble Code
The Throttle Actuator Control System has Detected a Sudden Low Air Flow
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, Ram, Chrysler, Jeep, Porsche, etc.
The P2174 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. This code, along with related codes (P2172, P2173, P2174, and P2175), all point to detected air flow problems.
Code P2174 is triggered by the PCM when a sudden decrease in air flow is detected in the throttle actuator control system.
This code may be related to a malfunction in the Throttle Actuator Control System, but it is also 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.
Code Severity & Symptoms
The severity of this code can range from moderate to severe depending on the specific malfunction. Symptoms of a P2174 trouble code may include:
Common Causes Of This DTC Code
Potential causes of the P2174 throttle engine code may include:
P2174 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.
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, its function is to alert 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 important 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 malfunction that the PCM is detecting, which is causing the engine to enter fail-safe or limp mode.
Once all other codes have been cleared or if no other codes are detected, and the Throttle Control Actuator code still persists, 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 when other malfunctions are causing this code to be set.
Rare Repair
Replacing the Throttle Actuator Control
Hopefully, the information provided in this article has been helpful in guiding you towards resolving the issue with your Throttle Actuator Control System. However, it is important to prioritize the specific technical data and service bulletins for your vehicle.
