Generic
Type:
    Powertrain - Ignition System or Misfire - ISO/SAE Controlled
Description:
    Timing Reference High Resolution Signal "A" Too Few Pulses

GM
Type:
    Powertrain - Ignition System or Misfire - ISO/SAE Controlled
Description:
    Dl High-resolution Signal Circuit Conditions
Cause:
    Engine running, then the PCM detected that Dl Low-resolution signals were received without receiving any Dl high-resolution signals, condition met for less than 1 second