P0321 OBD Trouble Code

1 result found

P0321 - GM
Type Powertrain - Ignition System or Misfire - ISO/SAE Controlled
Description

1C Module Spark Reference Circuit Conditions

Cause

Engine running below 1200 rpm, then the PCM detected 150 fuel control pulses with no spark reference (no 18X CKP pulses) signals

Try also: https://www.obd-codes.com/p0321