GM OBD Trouble Code 86

Engine Control Module Analog/Digital Error

The Engine Control Module (ECM) monitors its internal circuitry for problems. These have been designated analog/digital faults.

Fault Code Description

  • 86 - Engine Control Module Analog/Digital Error


  • The Check Engine Light will illuminate when code 86 is present

Common Problems

  • In most cases, an internal ECM fault has triggered the code 86. If that is the case, the EMC should be replaced.

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