The P0122 OBD-II code indicates a problem with the Throttle/Pedal Position Sensor/Switch “A” Circuit Low Input. This code is part of the OBD-II system which monitors the performance of various components in your vehicle’s engine.
What Does the P0122 Code Mean?
OBD-II Code P0122 is defined as a Throttle/Pedal Position Sensor/Switch “A” Circuit Low Input. This means that the Powertrain Control Module (PCM) has detected a low voltage signal coming from the throttle or pedal position sensor, which measures the position of the accelerator pedal and relays that information to the PCM.
What Causes the P0122 Code?
The P0122 code can be triggered by various issues, including:
- Defective Throttle Position Sensor or Switch
- Torn or jammed floor mats interfering with the pedal
- Faulty or corroded wiring or connections related to the Throttle/Pedal Position Sensor/Switch
What Are the Symptoms of the P0122 Code?
Common symptoms associated with the P0122 code include:
- Illumination of the Check Engine Light
- Possible hard starting of the engine
- Engine hesitation during acceleration
- No noticeable symptoms in some cases
How Serious Is the P0122 Code?
The P0122 code is classified as urgent. If not addressed promptly, it can lead to significant malfunctions that may endanger the vehicle’s performance and the safety of the driver and passengers. The PCM may limit the vehicle’s speed to 20 mph or less to protect the engine, which can leave you stranded or in unsafe situations.
How to Diagnose the P0122 Code
Diagnosing the P0122 code involves several steps:
- Record freeze frame data and perform a test drive to replicate the conditions that triggered the code.
- Monitor engine load, Mass Air Flow, RPM, and road speed using a data streaming scan tool.
- Check the Throttle/Pedal Position Sensor connector for a steady 5-volt reference voltage and a good ground.
- Perform tests on the Throttle/Pedal Position Sensor output and observe voltage changes as you manually operate the throttle or pedal.
Common Repairs for the P0122 Code
Common repairs that may be necessary for resolving the P0122 code include:
- Replacing the Throttle Position Sensor or Switch if defective
- Repairing or replacing damaged wiring or connections
- Clearing out any obstructions such as jammed floor mats
How Much Does It Cost to Fix the P0122 Code?
The cost to fix the P0122 code can vary widely based on the underlying issue. Basic repairs, such as cleaning connections, may cost less than $100, while replacing the Throttle Position Sensor can range from $100 to $300 depending on labor rates and parts.
Can I Fix the P0122 Code Myself?
While some DIY enthusiasts may be able to address minor issues such as cleaning connections or checking for obstructions, it is recommended to have a professional perform a full diagnosis of the P0122 code to ensure that all potential causes are thoroughly evaluated and repaired as necessary.
