P1125
System
Powertrain (Throttle)
Scanner required
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Throttle Actuator Control Motor Circuit Open (GM)

Understand P1125, common causes, and the right SEAFLO pump to diagnose it.

GM electronic throttle actuator motor circuit open — throttle body may not respond to pedal input.

Common symptoms

  • Reduced engine power
  • Limp mode
  • Idle too high or too low

Typical causes

  • Failed throttle body motor
  • Open circuit in TAC harness
  • Connector at throttle body
  • Blown ETCS fuse

What scanner do you need?

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

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Frequently asked questions

Can I diagnose P1125 with a basic code reader?
P1125 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 P1125?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.