ECM/PCM Code Description
Need a step-by-step guide?
Get an AI-powered repair guide with parts lists, cost estimates, and clear instructions for your 1994 Chevrolet.
DTC 13 - Oxygen Sensor (O2S) Circuit
DTC 14 - Engine Coolant Temperature (ECT) Sensor - high temperature
DTC 15 - Engine Coolant Temperature (ECT) Sensor - low temperature
DTC 19 - Intermittent 7X Reference Signal
DTC 21 - Throttle Position (TP) Sensor Circuit - signal voltage high
DTC 22 - Throttle Position (TP) Sensor Circuit - signal voltage low
DTC 23 - Intake Air Temperature (IAT) Circuit - low temperature
DTC 24 - Vehicle Speed Sensor (VSS) Circuit
DTC 25 - Intake Air Temperature (IAT) Circuit - high temperature
DTC 26 - Quad-Driver Module (QDSM)
DTC 27 - Quad-Driver Module (QDM 1)
DTC 28 - Quad-Driver Module (QDM 2)
DTC 32 - Exhaust Gas Recirculation (EGR) System Failure
DTC 33 - Manifold Absolute Pressure (MAP) Sensor - low vacuum
DTC 34 - Manifold Absolute Pressure (MAP) Sensor - high vacuum
DTC 35 - Improper Idle Speed (IAC)
DTC 43 - Electronic Spark Control (ESC) - Knock Sensor
DTC 44 - Oxygen Sensor (O2S) Circuit - Lean Exhaust Indicated
DTC 45 - Oxygen Sensor (O2S) Circuit - Rich Exhaust Indicated
DTC 51 - EPROM or PCM Failure
DTC 53 - Improper Ignition Voltage
DTC 55 - Lean in Power Enrichment
DTC 66 - A/C Refrigerant Pressure Sensor Circuit