Powertrain
Generic/SAE
OBD-II Fault Code
P0227: Throttle/Petal Position Sensor/Switch C Circuit Low Input
Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P0227.
Throttle / pedal sensor
Use this category to narrow your checks before replacing parts.
High
Severity is a general guide. Confirm with scan-tool data and vehicle symptoms.
What P0227 usually means
Throttle/Petal Position Sensor/Switch C Circuit Low Input.
Common symptoms
Check Engine light; Poor drivability or reduced fuel economy depending on fault; Reduced power / limp mode possible; Hesitation or unstable idle
Likely causes
Dirty throttle body; Faulty throttle/pedal position sensor; Wiring/connector fault; Adaptation needed; Low signal voltage; Weak power supply; High resistance/poor ground; Failed sensor
Diagnostic checks
Scan all modules and record freeze-frame data before clearing codes; Check battery voltage and related fuses; Inspect throttle body and connector; Check sensor correlation data with scan tool; Check sensor reference voltage, ground and signal voltage
Repair guidance
Clean throttle body if appropriate, repair wiring, perform throttle relearn, replace failed sensor/body after testing; Repair poor ground/power feed or replace confirmed faulty sensor
Verification after repair
Clear code, road-test through the same drive condition, then rescan