P0122
Throttle Position Sensor Circuit Low
Medium — service soonPowertrain (engine & transmission)
System
Powertrain (engine & transmission)
Type
Generic (standardized)
Subsystem
Fuel & air metering
What it means
The throttle-position sensor is sending a lower-than-expected voltage to the ECU.
Symptoms
Hesitation, stalling, erratic idle, or limp mode.
Common causes
Faulty TPS, wiring/connector problem, or a dirty throttle body.
Recommended action
Check the sensor wiring and connector; clean the throttle body or replace the sensor as needed.
Related codes
P0300Random/Multiple Cylinder Misfire DetectedP0301Cylinder 1 Misfire DetectedP0302Cylinder 2 Misfire DetectedP0303Cylinder 3 Misfire DetectedP0304Cylinder 4 Misfire DetectedP0420Catalyst System Efficiency Below Threshold (Bank 1)P0430Catalyst System Efficiency Below Threshold (Bank 2)P0171System Too Lean (Bank 1)P0174System Too Lean (Bank 2)P0172System Too Rich (Bank 1)P0175System Too Rich (Bank 2)P0101Mass Air Flow (MAF) Circuit Range/Performance
FAQ — P0122
What does code P0122 mean?
Throttle Position Sensor Circuit Low. The throttle-position sensor is sending a lower-than-expected voltage to the ECU.
What are the symptoms of P0122?
Hesitation, stalling, erratic idle, or limp mode.
What causes P0122?
Faulty TPS, wiring/connector problem, or a dirty throttle body.
What should I do about P0122?
Check the sensor wiring and connector; clean the throttle body or replace the sensor as needed.
General reference based on the SAE J2012 standard. Exact causes for your vehicle may differ — when in doubt, consult a workshop.
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