OBD-II Code P2174 is defined as a Throttle Actuator Control System – Sudden Low Air Flow Detected. This code indicates that the engine control module (PCM) has detected an unexpected low airflow condition, which can affect engine performance.
What Does the P2174 Code Mean?
The P2174 code signifies that the electronic throttle control system (ETCS) is not functioning properly due to a sudden drop in airflow. This can lead to reduced engine performance and trigger the PCM to enter “limp home mode,” which restricts engine power to prevent further damage.
What Causes the P2174 Code?
Several factors can trigger the P2174 code, including:
- Accelerator Pedal Position (APP) assembly failure
- Clogged air filter
- Dirty or miscalibrated Mass Airflow (MAF) sensor
- Powertrain Control Module (PCM) failure
- Throttle control motor failure
- Wiring issues
What Are the Symptoms of the P2174 Code?
Drivers may experience the following symptoms when the P2174 code is present:
- Decreased engine performance
- Engine may enter limp home mode (reduced performance)
- Increased fuel consumption
How Serious Is the P2174 Code?
The P2174 code is considered urgent and requires immediate attention. Ignoring this code can lead to significant engine damage and unsafe driving conditions due to the potential for unintended acceleration.
How to Diagnose the P2174 Code
To diagnose the P2174 code, a mechanic should:
- Use an OBD-II scanner to confirm the code and check for related codes.
- Inspect the accelerator pedal position sensor and wiring for damage or corrosion.
- Examine the air intake system for clogs and ensure the air filter is clean.
- Test the MAF sensor for proper operation.
- Check the throttle control motor for functionality.
Common Repairs for the P2174 Code
Repairs for the P2174 code may include:
- Replacing or repairing the Accelerator Pedal Position (APP) assembly
- Cleaning or replacing the MAF sensor
- Replacing a clogged air filter
- Repairing or replacing damaged wiring
- Replacing the throttle control motor
- Reprogramming or replacing the PCM if necessary
How Much Does It Cost to Fix the P2174 Code?
The cost to fix the P2174 code can vary widely based on the specific issue and labor rates, but repairs can range from $100 to $1,500. Simple fixes like cleaning the MAF sensor may be less expensive, while replacing the PCM can be significantly more costly.
Can I Fix the P2174 Code Myself?
While some DIY enthusiasts may be able to address issues like cleaning the MAF sensor or replacing the air filter, diagnosing the P2174 code accurately often requires specialized tools and knowledge. If you are not experienced with automotive repairs, it is advisable to seek professional assistance to prevent further damage.
