P0122: Throttle Position Sensor/Switch Circuit Low Input
Can you still drive? Not recommended. The vehicle is likely in limp mode with severely reduced power. It may be unsafe in traffic situations requiring quick acceleration.
What Does P0122 Mean?
Code P0122 indicates that the throttle position sensor is producing an abnormally low voltage signal. This typically means the sensor output is below 0.2 volts, which the ECM interprets as a fault. The vehicle may enter limp mode with very limited throttle response as a safety measure.
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
- Failed throttle position sensor
- Open circuit in signal wire
- Corroded connector pins
- Damaged wiring between TPS and ECM
- Faulty throttle body assembly
Symptoms
- Check engine light on
- Vehicle in limp mode with limited power
- Very sluggish acceleration
- High idle speed
- Transmission stuck in one gear
Diagnostic Steps
- 1Check TPS connector for loose or corroded pins
- 2Measure TPS signal voltage with key on engine off
- 3Test TPS reference voltage (should be approximately 5V)
- 4Check signal wire continuity to ECM
- 5Inspect wiring harness for damage or chafing
- 6Test ground circuit for proper continuity
Recommended Parts & Tools
throttle position sensor
throttle body assembly
wiring repair kit
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $50 - $500 |
Get a Personalized AI Diagnostic Report
Get a detailed AI diagnosis for code P0122 specific to your vehicle. Includes step-by-step repair instructions, exact parts needed, and a cost breakdown tailored to your make and model.
Chat with AI About P0122Commonly Affected Vehicles
Related Recalls
Frequently Asked Questions
What is limp mode?
Limp mode is a safety feature that severely limits engine power and transmission function when a critical sensor fails. It allows you to slowly drive to a repair shop.
Can I drive in limp mode?
You can drive short distances at low speeds, but the vehicle will have very limited power. Avoid highways and situations requiring quick acceleration.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
Related Codes
Affiliate Disclosure: This page contains affiliate links. If you purchase products through these links, we may earn a small commission at no additional cost to you. This helps us maintain this free resource. We only recommend products we believe will help you diagnose and repair your vehicle. Prices shown are estimates and may vary.