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Engine Controls - Tests W/Codes - V6 Expand All (for easy ctrl-f) Collapse All Introduction Self-Diagnostic System Trouble Code Charts Notes Code 13, Open Oxygen Sensor Circuit 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 23, Mat Sensor Temp. Low Code 24, Vehicle Speed Sensor Code 25, Mat Sensor Temp. High Code 31, Turbo OVERBOOST (4.3L Turbo) Code 32, EGR System Error Code 32, EGR System Error - 4.3L With Linear EGR Code 33, Map Sensor Signal Voltage High Code 34, Map Sensor Signal Voltage Low Code 35, Idle Speed Error 2.5L & 4.3L Turbo Code 42, Electronic Spark Timing (Est) Code 43, Electronic Spark Control Code 44, Lean Exhaust Indication Code 45, Rich Exhaust Indication Code 51, Faulty Prom/Mem-Cal Code 52, Faulty CALPAK (Except 2.5L) Code 53, System OVERVOLTAGE (2.5L) Code 54, Fuel Pump Circuit Code 55, ECM Error (Except 2.5L)