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Engine Controls - Tests W/Codes - V8 Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Trouble Codes Code 13, Open Oxygen Sensor Circuit (Except 4.3L Turbo) Code 14, Coolant Sensor Signal Voltage Low Code 15, Coolant Sensor Signal Voltage High Code 21, TPS Signal Voltage High Code 22, TPS Signal Voltage Low Code 24, VSS (Except 3.1L, 3.8L & Models W/4L80-E Trans.) Code 24, VSS (2WD With 4L80-E Transmission) Code 24, VSS (4WD With 4L80-E Transmission) Code 32, EGR System Error (4.3L "C"/"G"/"K"/"P" Series With 4L80-E) Code 32, EGR System Error (All Engines W/4L80-E Except 4.3L) Code 32, EGR System Error (All Engines Without 4L80-E Except 3.1L, & 4.3L Turbo & CPI) Code 33, Map Sensor Signal Voltage High Code 34, Map Sensor Signal Voltage Low Code 42, Electronic Spark Timing (Except 3.8L) Code 43, Electronic Spark Control (All Engines Except 4.3L Turbo & Models With 4L80-E Trans) Code 43, Electronic Spark Control (4.3L Turbo & Models With 4L80-E Transmission) Code 44, Lean Exhaust Indication (Except 4.3L Turbo) Code 45, Rich Exhaust Indication (Except 4.3L Turbo) Code 51, Faulty Prom/Mem-Cal Code 52, Faulty CALPAK (Except 2.5L) Code 55, ECM/Pcm Error (Except 2.5L) Code 54, Fuel Pump Circuit