Code #12: No Distributor Reference Pulse.
Code #13: Oxygen Sensor Circuit.
Code #14: Shorted Coolant Sensor Circuit.
Code #15: Open Coolant Sensor Circuit.
Code #21: Throttle Position Sensor Circuit.
Code #23: Mixture Control Solenoid Circuit.
Code #24: Vehicle Speed Sensor Circuit.
Code #32: Baro Sensor Circuit Low.
Code #34: Vacuum Map Sensor Circuit.
Code #44: Oxygen Sensor Lean.
Code #45: Oxygen Sensor Rich.
Code #51: Faulty or Mis-Installed PROM.
Code #52: Faulty ECM.
Code #53: Faulty ECM.
Code #54: Shorted Mixture Control Solenoid.
Code #55: Faulty Oxygen Sensor or ECM.
Article ID: 693
Created: August 1, 2014
Last Updated: August 1, 2014
Online URL: https://www.corvetteactioncenter.com/tech/knowledgebase/article/1981-corvette-ecm-codes-693.html