P0122 Code: Throttle/Pedal Position Sensor/Switch A Circuit Low Input
Note: We do not currently have verified model-specific diagnostic data for the Dodge Dart. The symptoms and fixes listed below are the standard generic OBD2 guidelines for the P0122 code. Always consult a factory service manual before replacing parts.
What does this mean?
Code P0122 signifies that the Powertrain Control Module (PCM) has detected a voltage signal from the Throttle Position Sensor (TPS) or Accelerator Pedal Position (APP) Sensor 'A' circuit that is consistently below its specified minimum operating threshold. This sensor is crucial for informing the PCM about the throttle plate's angle or the accelerator pedal's position, which directly influences fuel delivery and ignition timing. A low input typically indicates an open circuit, a short to ground, a faulty sensor, or an issue with the PCM itself, leading to incorrect throttle control and potential drivability problems.
How serious is this code?
A P0122 code can significantly impact vehicle drivability and safety. Symptoms may include an erratic idle, hesitation or surge during acceleration, a "limp mode" activation (reduced engine power), or even sudden engine stalling. These conditions can be unpredictable and dangerous, especially in traffic or at higher speeds, increasing the risk of an accident. It is advisable to address this issue promptly.
Diagnostic system: Sensor circuit and live data
On a Dodge Dart, the P0122 code should be diagnosed as part of the sensor circuit and live data group. Related codes and live data from this same system can change the repair priority, so avoid replacing parts from the code name alone.
Most Common Causes for Dodge Dart
- Faulty throttle position sensor (TPS)
- Damaged, chafed, or broken wiring harness
- Corroded or loose electrical connector
Symptoms to Watch For
- Check Engine Light is illuminated
- Poor acceleration or sluggish response
- Engine stalling or dying unexpectedly
- Vehicle enters reduced power / limp mode
- Rough or unstable idle
Before replacing parts, check these first
- Inspect the connector for corrosion, broken locks, oil intrusion, or heat damage.
- Verify 5V reference, ground, and signal with a multimeter where applicable.
- Compare live sensor data to realistic engine temperature, pressure, airflow, or throttle values.
- Check for blown fuses, weak battery voltage, and damaged connectors before buying major parts.
How to Diagnose
Common Mistakes
Replacing the named sensor without testing power, ground, signal, and wiring continuity first. Always confirm the fault with freeze-frame data, live data, visual inspection, and circuit checks before spending money on parts.
Frequently Asked Questions
Can I drive with the P0122 code?
If the check engine light is solid, you can usually drive to a safe location or mechanic. If the light is flashing, pull over immediately to prevent catastrophic engine or catalytic converter damage.
Will the P0122 code clear itself?
Once the underlying problem is fixed, the engine computer will run its self-checks. If it passes over several drive cycles, the light will turn off automatically. You can also clear it immediately using an OBD2 scanner.
Will this code fail an emissions test?
Yes. If the Check Engine Light is on due to the P0122 code, your Dodge will automatically fail an OBD2 plug-in emissions or smog test.
What should I check first for P0122?
Inspect the connector for corrosion, broken locks, oil intrusion, or heat damage. Verify 5V reference, ground, and signal with a multimeter where applicable. Compare live sensor data to realistic engine temperature, pressure, airflow, or throttle values.
Join the Discussion
Repair Estimate
Fuse, connector, wiring, cleaning, or basic inspection
Major component replacement after live data and circuit tests confirm failure
Sensor replacement can be moderate cost, but wiring and connector repairs are common and cheaper.
DIY Difficulty
Can usually be performed at home with basic hand tools.