P0123: Throttle/Pedal Position Sensor/Switch A Circuit High Input
Can you still drive? Do not drive if the engine is racing or behaving erratically. If the vehicle is in limp mode, drive carefully and directly to a repair facility.
What Does P0123 Mean?
Code P0123 is triggered when the throttle position sensor sends a voltage signal that is higher than the expected maximum. This tells the ECU the throttle is wide open when it may not be, leading to incorrect fuel delivery and potential safety concerns. The engine may race or the vehicle may enter limp mode.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Short circuit in TPS wiring
- Faulty throttle position sensor
- Corroded TPS connector
- Misadjusted TPS
Symptoms
- Check engine light on
- Engine racing at idle
- Vehicle in limp mode
- Surging or uncontrolled acceleration feeling
- Poor throttle response
Diagnostic Steps
- 1Read and document freeze frame data
- 2Check TPS voltage with key on, engine off at closed throttle
- 3Inspect TPS wiring for shorts to the 5V reference circuit
- 4Check for corrosion at the TPS connector
- 5Replace TPS if voltage is stuck high or reads above specification
Recommended Parts & Tools
throttle position sensor
electrical connector cleaner
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $50 - $400 |
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Chat with AI About P0123Commonly Affected Vehicles
Related Recalls
1 Active Recall — 2026 Jeep Cherokee
The following NHTSA safety recalls have been issued for this vehicle. Contact your dealer to check if your vehicle is affected.
EXTERIOR LIGHTING:BRAKE LIGHTS
Chrysler (FCA US, LLC) is recalling certain 2024-2026 Jeep Wagoneer S, 2025-2026 Ram 1500 Pickup, Ram 2500 Pickup, Ram 3500 Pickup, Ram 3500 Cab Chassis, Ram 4500 Cab Chassis, Ram 5500 Cab Chassis, and 2026 Jeep Cherokee vehicles. Due to an improperly designed trailer tow module, the trailer lights may fail to illuminate and the trailer brakes may fail.
Remedy: Dealers will replace the trailer tow module, free of charge. Owner notification letters were mailed beginning March 17, 2026. Owners may contact FCA US, LLC customer service at 1-800-853-1403. FCA US, LLC's number for this recall is 03D. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on February 10, 2026.
Data provided by the National Highway Traffic Safety Administration (NHTSA).
Frequently Asked Questions
Why is my engine racing with P0123?
The high TPS voltage tells the ECU the throttle is wide open. The engine computer injects more fuel accordingly, causing the engine to race even though you are not pressing the gas pedal.
Can a dirty throttle body cause P0123?
A dirty throttle body alone usually does not cause P0123, but carbon buildup can sometimes affect the TPS mounting or movement, contributing to abnormal readings.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
Related Codes
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