Lexus GX 460 P0121/P0123 no-throttle-response diagnosis This Lexus GX guide is based on 1 documented technical case, including 1 confirmed successful repair outcome. It summarizes the captured evidence without assuming every vehicle with a similar symptom has the same cause. Documented applicability includes 2013.
What Drivers or Technicians Reported
Documented complaints included: Accelerator pedal produces no throttle response with MIL.
Fault Codes Seen in Supporting Cases
Codes included P0121, P0123. A code is a diagnostic clue, not automatic proof that a specific part failed.
Causes Confirmed in Documented Cases
ECM failure supported by successful replacement after TPS signal/power/ground checks
What the Diagnostic Process Found
TPS signal scoped without a glitch; power and ground reported good
Repairs That Corrected Documented Cases
Replace ECM
Lexus GX Diagnosis in Hickory, NC
Mich's Foreign Cars has served Hickory and the surrounding Western North Carolina area since 1983. We specialize in European and foreign vehicles and use professional diagnostic equipment to identify the cause before recommending repairs. If your Lexus GX is showing this symptom or fault pattern, call Mich's Foreign Cars at 828-324-6012 to schedule diagnosis.