P1128
System
Powertrain (Throttle)
Scanner som krävs
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.

Vanliga symptom

  • Engine power reduced
  • Pedal dead zone
  • Idle surge

Typiska orsaker

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

Vilken scanner behöver du?

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

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade FOXWELL-scannrar

Vanliga frågor

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.