LT1 (`92 - `93) TROUBLE CODES
CODE # DESCRIPTION
DTC 13 Bank 1 (Left) Oxygen Sensor (O2S) Circuit (Open Circuit)
DTC 14 Engine Coolant Temperature (ECT) Sensor Circuit (High Temp. Indicated)
DTC 15 Engine Coolant Temperature (ECT) Sensor Circuit (Low Temp. Indicated)
DTC 16 Distributor Ignition System (Low Resolution Pulse)
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) Sensor Circuit (Low Temp. Indicated)
DTC 24 Vehicle Speed Sensor (VSS) Circuit
DTC 25 Intake Air Temperature (IAT) Sensor Circuit (High Temp. Indicated)
DTC 26 Quad-Driver Module (QDM) #1 Circuit
DTC 27 Quad-Driver Module (QDM) #2 Circuit
DTC 28 Quad-Driver Module (QDM) #3 Circuit
DTC 32 Exhaust Gas Recirculation (EGR) Circuit
DTC 33 Manifold Absolute Pressure (MAP) Sensor Circuit (Signal Voltage High-Low Vacuum)
DTC 34 Manifold Absolute Pressure (MAP) Sensor Circuit (Signal Voltage Low-High Vacuum)
DTC 36 Distributor Ignition System 
(Fault High Resolution Pulse or Extra Low Resolution Pulse Detected)
DTC 41 Ignition Control (IC) Circuit (Open or Shorted Circuit)
DTC 42 Ignition Control (IC) Circuit (Grounded Circuit)
DTC 43 Knock Sensor (KS) Circuit
DTC 44 Bank l (Left) Oxygen Sensor (O2S) Circuit (Lean Exhaust Indicated)
DTC 45 Bank l (Left) Oxygen Sensor (O2S) Circuit (Rich Exhaust Indicated)
DTC 46 Personal Automotive Security System (PASS-Key 11) Circuit
DTC 51 PROM Error (Faulty or Incorrect PROM)
DTC 53 System Voltage
DTC 55 Fuel Lean Monitor
DTC 61 A/C System Performance
DTC 63 Bank 2 (Right) Oxygen Sensor (O2S) Circuit (Open Circuit)
DTC 64 Bank 2 (Right) Oxygen Sensor (O2S) Circuit (Lean Exhaust Indicated)
DTC 65 Bank 2 (Right) Oxygen Sensor (O2S) Circuit (Rich Exhaust Indicated)
DTC 66 A/C Refrigerant Pressure Sensor Circuit (Open or Shorted)
DTC 67 A/C Refrigerant Pressure Sensor Circuit 
(Pressure Sensor or A/C Clutch Circuit Problem)
DTC 68 A/C Relay Circuit (Shorted Circuit)
DTC 69 A/C Clutch Circuit
DTC 71 A/C Evaporator Temperature Sensor Circuit (Open or Shorted)