Subaru P2122 Error Code: How to Fix It

Q: Can I drive with Subaru error code P2122?

You can drive short distances, but the vehicle may enter limp mode with reduced power and poor acceleration. Avoid highway driving and repair the issue promptly to prevent potential safety hazards or engine damage.

Q: What causes Subaru P2122 error code?

Common causes include faulty throttle position sensor, damaged wiring harness, corroded connectors, carbon buildup on the throttle body, or a failing accelerator pedal position sensor. Electrical issues in the sensor circuits are the most frequent culprits.

Q: How much does it cost to fix P2122 on a Subaru?

Costs range from $50-150 for cleaning and minor repairs to $200-600 for sensor replacement. Professional diagnosis typically costs $100-150, while throttle body or pedal sensor replacement can cost $300-600 including labor.

Q: Will P2122 clear itself on Subaru vehicles?

The code will not clear itself automatically. Even if the underlying problem is temporarily resolved, the code remains stored until manually cleared with an OBD2 scanner or the issue is permanently fixed.

Q: Is P2122 the same as P2120 or P2121 on Subaru?

No, these are different codes for the same throttle position sensor system. P2120 indicates a circuit malfunction, P2121 shows circuit range problems, while P2122 specifically indicates a low input signal from sensor D circuit.

Abstract

The Subaru P2122 error code indicates a problem with the throttle position sensor D circuit showing a low input signal. This sensor monitors your accelerator pedal position and communicates with the engine control module to regulate throttle response. When this circuit fails, you may experience reduced power, poor acceleration, or the vehicle entering limp mode.