P1128
Systeem
Powertrain (Throttle)
Scanner vereist
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Throttle Control Motor Circuit Low (GM)

Understand P1128, common causes, and the right FOXWELL scanner to diagnose it.

GM throttle actuator motor circuit shorted low — common after throttle body cleaning if connector not seated.

Veelvoorkomende symptomen

  • Engine power reduced
  • Pedal dead zone
  • Idle surge

Typische oorzaken

  • Short in TAC motor circuit
  • Failed throttle body
  • Water intrusion in connector

Welke scanner heb je nodig?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Gebruik live data en freeze frame voordat je onderdelen vervangt. ABS-, SRS- en U-codes vereisen meestal een full-system scanner.

Diagnosetips

  • Leg freeze frame vast wanneer de code voor het eerst verschijnt
  • Wis de code pas na het oplossen van de oorzaak
  • Controleer op gerelateerde pending codes
  • Controleer of accuspanning boven 12,4 V is voordat je sensoren suspecteert

Aanbevolen FOXWELL scanners

Veelgestelde vragen

Can I diagnose P1128 with a basic code reader?
P1128 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P1128?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.