OBD-1 Diagnostic Codes
Click on the code for a more detailed description
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Code 11 Transaxle Codes Present
Transaxle codes are Here
Code 12 Diagnostic System Check
Code 13 Oxygen sensor, circuit open or not ready
Code 14 Engine coolant temp. circuit. Temp. out of range high
Code 15 Engine coolant temp. circuit. Temp. out of range low
Code 17 PCM fault, pullup resistor
Code 19 1991Perf. (LLO) 1992-1994 vehicles. 6X signal fault
Code 21 Throttle position circuit out of range high
Code 22 Throttle position circuit out of range low
Code 23 Inlet air temp. (IAT) out of range low
Code 24 Vehicle speed sensor (VSS) circuit, no signal
Code 25 Inlet air temp. (IAT) out of range high
Code 26 Quad Driver output fault
Code 32 EGR system fault
Code 33 MAP sensor circuit, out of range high
Code 34 MAP sensor circuit, out of range low
Code 35 Idle air control rpm out of range
Code 41 Ignition control circuit open or shorted
Code 41A EST circuit open
Code 41B EST circuit shorted
Code 42 EST bypass, open or shorted
Code 42A Bypass circuit grounded
Code 42B Bypass circuit open
Code 42C Bypass circuit shorted
Code 43 ESC (knock sensor) circuit open or shorted
Code 44 Oxygen sensor indicates system lean
Code 45 Oxygen sensor indicates system rich
Code 46 Power steering pressure switch circuit, open
Code 49 Idle rpm out of limit high (vacuum leak)
Code 51 PCM memory error
Code 55 A/D convertor error in PCM
Code 81 ABS message fault (1993+ vehicles with TCS)
Code 82 PCM internal communication fault
Click on the code for a more detailed description
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Code 11 Transaxle Codes Present
Transaxle codes are Here
Code 12 Diagnostic System Check
Code 13 Oxygen sensor, circuit open or not ready
Code 14 Engine coolant temp. circuit. Temp. out of range high
Code 15 Engine coolant temp. circuit. Temp. out of range low
Code 17 PCM fault, pullup resistor
Code 19 1991Perf. (LLO) 1992-1994 vehicles. 6X signal fault
Code 21 Throttle position circuit out of range high
Code 22 Throttle position circuit out of range low
Code 23 Inlet air temp. (IAT) out of range low
Code 24 Vehicle speed sensor (VSS) circuit, no signal
Code 25 Inlet air temp. (IAT) out of range high
Code 26 Quad Driver output fault
Code 32 EGR system fault
Code 33 MAP sensor circuit, out of range high
Code 34 MAP sensor circuit, out of range low
Code 35 Idle air control rpm out of range
Code 41 Ignition control circuit open or shorted
Code 41A EST circuit open
Code 41B EST circuit shorted
Code 42 EST bypass, open or shorted
Code 42A Bypass circuit grounded
Code 42B Bypass circuit open
Code 42C Bypass circuit shorted
Code 43 ESC (knock sensor) circuit open or shorted
Code 44 Oxygen sensor indicates system lean
Code 45 Oxygen sensor indicates system rich
Code 46 Power steering pressure switch circuit, open
Code 49 Idle rpm out of limit high (vacuum leak)
Code 51 PCM memory error
Code 55 A/D convertor error in PCM
Code 81 ABS message fault (1993+ vehicles with TCS)
Code 82 PCM internal communication fault
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