P1351
System
Powertrain (Ignition)
Scanner required
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Ignition Control Module Circuit Voltage (GM)

Understand P1351, common causes, and the right TOPDON scanner to diagnose it.

Ignition control module supply voltage fault on distributor-based GM systems.

Common symptoms

  • No-start
  • Stalling
  • No spark

Typical causes

  • Failed ignition module
  • Wiring to ICM
  • Corrosion at distributor

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

Recommended TOPDON scanners

Frequently asked questions

Can I diagnose P1351 with a basic code reader?
P1351 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 P1351?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.