Chevrolet OBD / OBD2 Codes >> Camaro 3.4L – Camaro 5.7L – Caprice 5.7L – Caprice Wagon 4.3L – Corvette 5.7L (OBD-II)

ModelYearEngine identificationSystem
Camaro 3.4L1993-95VIN  position 8 = SGM
Camaro 5.7L1993-94VIN  position 8 = PGM
Caprice 5.7L1993-95VIN  position 8 = PGM
Caprice Wagon 4.3L1993-95VIN  position 8 = WGM
Corvette 5.7L  (OBO-I)1994VIN  position 8 = PGM

General information

  • Malfunction indicator lamp (MIL) will illuminate if certain faults are recorded.
  • ECM operates in backup mode if sensors fail, to enable vehicle to be driven to repair shop.
  • Trouble codes can be displayed by the MIL or by using a Scan Tool connected to the data link connector (DLC).

Accessing

Models with data link connector (DLC) terminal B connected
  • Access data link connector (DLC).
  • Jump data link connector (DLC) terminals A and B [1].
  • Switch ignition ON. Do NOT start engine.
  • Count MIL flashes. Note trouble codes. Compare with trouble code table.
  • Firstly trouble code 12 will be displayed 3 times.
  • Trouble codes consist of 2 groups, displayed as follows:
o First group indicates the ‘tens’ of the trouble code 2 [A].
o Second group indicates the ‘units’ of the trouble code 2 [C].
o A short pause separates each group 2 [B].
o A long pause separates each trouble code 2 [D].
o For example: Trouble code 12 displayed [2] . Start of diagnosis.
• Each additional trouble code will now be displayed 3 times, in ascending order.
 
NOTE: If no additional trouble codes are stored, code 12 will continue to be displayed.
• Trouble codes can also be displayed by using a Scan Tool connected to the data link connector (DLC) 1.
Models without data link connector (DLC) terminal B connected
• Trouble codes can only be displayed by using a Scan Tool connected to the data link connector (DLC) 1.

Erasing

NOTE: Disconnecting battery ground lead may cause driveability problems until the engine management system relearns basic values.
  • Ensure ignition switched OFF.
  • Disconnect battery ground cable for 30 seconds.
  • Reconnect battery ground cable .
  • Repeat checking procedure to ensure no trouble codes remain in ECM fault memory.
NOTE: Disconnecting battery ground lead may also erase memory from electronic units, such as radio.
• Trouble codes can also be erased by using a Scan Tool connected to the data link connector (DLC) 1.

Trouble code  identification

Flash codeFault locationProbable cause
11Malfunction indicator lamp (MIL) -circuit malfunctionWiring open circuit/short circuit to ground, MIL, ECM
12Start of diagnosisNo engine speed (RPM) signal received
13Oxygen sensor (02S), bank 2Wiring open circuit, 025, ECM
13Oxygen sensor (02S), bank 1Wiring open circuit, 025, ECM
14Engine coolant temperature (ECT) sensorvoltage lowWiring short circuit to ground, ECT sensor, ECM
15Engine coolant temperature (ECT) sensor voltage highWiring open circuit, ECT sensor, ECM
16System voltage lowWiring, alternator
16Distributor ignition system, low resolution signal -circuit malfunctionWiring, distributor, ECM
17Camshaft position (CMP) sensor -circuit malfunctionWiring, CMP sensor, mechanical fault, ECM
18Injector(s) -circuit malfunctionWiring, injector(s)
21Throttle position (TP) sensor -voltage highWiring open circuit/short circuit to positive, TP sensor, ECM
22Throttle position (TP) sensor -voltage lowWiring open circuit/short circuit to ground, TP sensor, ECM
23Intake air temperature (IAT) sensor -voltage highWiring open circuit, IAT sensor, ECM
24Vehicle speed sensor (VSS) -no signalWiring, VSS, ECM
25Intake air temperature (IAT) sensor -voltage lowWiring short circuit to ground, IAT sensor, ECM
26Evaporative emission (EVAP) canister purge valve -open!short circuitWiring, EVAP canister purge valve, ECM
26Engine control module (ECM), quad driver! output driver -circuit malfunctionWiring, ECM controlled components, ECM (!)
27Engine control module (ECM), quad driver! output driver -circuit malfunctionWiring, ECM controlled components, ECM (!)
27Exhaust gas recirculation (EGR) solenoidWiring, poor connections, EGR valve, ECM
28Engine control module (ECM), quad driverl output driver -circuit malfunctionWiring, ECM controlled components, ECM m
28Transmission range (TR) switch -malfunctionWiring, TR switch, ECM
29Secondary air injection (AIR) pump relay circuit malfunctionWiring, AIR pump relay, ECM
32Exhaust gas recirculation (EGR) solenoidWiring, poor connections, EGR valve, ECM
33Manifold absolute pressure (MAP) sensor voltage highWiring short circuit to positive, hose blocked/leaking, MAP sensor, ECM
34Manifold absolute pressure (MAP) sensor voltage lowWiring open circuit/short circuit to ground, MAP sensor, ECM
35Idle air control (lAC) valve IWiring open circuit/short circuit to groundl shortcircuit to positive, lAC valve, intake system leaking, fuel system, PCV valve, A/C system, mechanical fault, ECM
36Crankshaft position (CKP) sensor. at crankshaft pulley -24X signal circuit malfunctionWiring, CKP sensor, ECM
36Distributor ignition system. high resolution signal -circuit malfunctionWiring, distributor, ECM
37Brake pedal position (BPP) switch for torque converter clutch (TCC)Wiring, incorrectly adjusted, BPP switch, ECM
38Brake pedal position (BPP) switch, torque converter clutch (TCC) -low voltageWiring open circuit, incorrectly adjusted, BPPswitch, ECM
39Clutch pedal position (CPP) switchWiring, incorrectly adjusted, CPP switch, ECM
41Ignition control. timing signal -circuit malfunctionWiring, poor connections, ICM, ECM
42Ignition control. bypass signal -circuit malfunctionWiring, poor connections, ICM, ECM
43Knock sensor (KS) -circuit malfunctionWiring, KS, ECM
44Oxygen sensor (02S). bank 2 -mixture leanWiring open circuit/short circuit to ground,injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 025, ECM
44Oxygen sensor (02S)/heated oxygen sensor(H02S). bank 1 -mixture leanWiring open circuit/short circuit to ground,injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 02S/H02S,ECM
45Oxygen sensor (02S), bank 2 -mixture richWiring open circuit, fuel pressure high, injector(s) leaking, 025, EVAP purge valve, TP sensor, EGR system, ECM
450Oxygen sensor (02S)/heated oxygen sensor(H02S). bank 1 -mixture richWiring open circuit, fuel pressure high, injector(s)leaking, 02S/H02SEVAP purge valve, TP sensor, EGR system, ECM
46Immobilizer system, code -malfunctionIncorrect key, immobilizer control module, ECM
47Knock control module, removable part in engine control module (ECM) -circuit malfunctionWiring, poor connection, missing knock control module, ECM
48Mass air flow (MAF) sensor -no signalWiring, poor connections, MAF sensor, ECM
50System voltage lowAlternator
51Engine control module (ECM), PROMmalfunctionPoor connections, incorrect programming, ECM
52Engine oil temperature (EOT) sensor -voltagehighWiring, EOT sensor, ECM
53System voltage highAlternator
54Fuel pump circuit -voltage lowWiring open circuit/short circuit to ground, fuel pump relay, engine oil pressure warning lamp/fuel pump switch
55Engine control module (ECM), fuel lean monitorFuel filterllines blocked, fuel contamination
58Transmission fluid temperature (TFT) sensor voltage lowWiring short circuit to ground, TFT sensor, ECM
59Transmission fluid temperature (TFT) sensor voltage highWiring open circuit, TFT sensor, ECM
61A/C system -performanceRefrigerant low, wiring, A/C refrigerant pressure sensor, A/C evaporator temperature sensor, ECM
62Engine oil temperature (EOT) sensor -voltage lowWiring, EOT sensor, ECM
63Oxygen sensor (02S), bank 1Wiring open circuit, 025, ECM
63Oxygen sensor (02S)/heated oxygen sensor (H02S), bank 2Wiring open circuit, 025/H025, ECM
64Oxygen sensor (02S), bank 1 -mixture leanWiring open circuit/short circuit to ground,injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 025, ECM ·
64Oxygen sensor (02S)/heated oxygen sensor(H02S), bank 2 -mixture lean ,Wiring open circuit/short circuit to ground,injector(s) blocked, fuel contamination, fuel pressure low, exhaust system leaking, 025/H025,ECM
65Oxygen sensor (02S), bank 1 -mixture richWiring open circuit, fuel pressure high, injector(s) leaking, 025, EVAP purge valve, TP sensor, EGR system, ECM
65Oxygen sensor (02S)/heated oxygen sensor (H02S), bank 2 -mixture richWiring open circuit, fuel pressure high, injector(s) leaking, 025/H025, EVAP purge valve, TP sensor, EGR system, ECM
66A/C refrigerant pressure sensor -voltage lowWiring open circuit/short circuit to ground, A/C refrigerant pressure sensor, ECM
67A/C refrigerant pressure sensor -circuit malfunctionWiring open circuit, A/C refrigerant pressuresensor, ECM
68A/C compressor clutch relay -circuit malfunctionWiring short circuit, A/C compressor clutch relay, ECM
69A/C compressor clutch relay -circuit malfunctionWiring open circuit, A/C compressor clutch relay, ECM
70A/C refrigerant pressure sensor -voltage highWiring open circuit/short circuit to positive, ‘A/C refrigerant pressure sensor, ECM
71A/C evaporator temperature sensor -voltage highWiring, poor connections, A/C evaporator temperature sensor
72Vehicle speed sensor (V88) -circuit malfunctionWiring, V55, ECM
73A/C evaporator temperature sensor -voltage lowWiring, poor connections, A/C evaporator temperature sensor
73Transmission fluid pressure (TFP) control solenoid -circuit malfunctionWiring, poor connection, TFP solenoid
74Traction control system (TC5), active signal malfunctionWiring short to ground, AB5ITC5, ECM
75Exhaust gas recirculation (EGR) solenoid 1 circuit malfunctionWiring, EGR valve, ECM
758ystem voltage low, engine control module (ECM)Wiring, battery, alternator, ECM
76Exhaust gas recirculation (EGR) solenoid 2 circuit malfunctionWiring, EGR valve, ECM
77Exhaust gas recirculation (EGR) solenoid 3 circuit malfunctionWiring, EGR valve, ECM
77Engine coolant blower motor relay -circuit malfunctionWiring, engine coolant blower motor relay, ECM
78Engine coolant blower motor relay 2 -circuit malfunctionWiring open circuit/short circuit to groundl short circuit to positive, engine coolant blower motor relay, ECM
79Transmission fluid temperature (TFT) highTransmission mechanical fault, towing weight limit exceeded
80Torque converter clutch (TCC) -slippingWiring, TCC solenoid, transmission mechanical fault, ECM
81Brake pedal position (BPP) switch , torque converter clutch (TCC) -circuit malfunctionWiring, BPP switch, ECM
81Transmission shift solenoid (88), 2nd-3rd circuit malfunctionWiring, 55, ECM
82Crankshaft position (CKP) sensor, in cylinder block -3X signal circuit malfunctionWiring open circuit/short circuit to ground, CKP sensor, ICM
82Transmission shift solenoid (88), 1st-2nd -circuit malfunctionWiring, 55, ECM
83Reyerse gear inhibit solenoid -circuit malfunctionWiring, reverse gear inhibit solenoid, ECM
83Torque converter clutch (TCC) solenoid, pulse width modulated -circuit malfunctionWiring open circuit/short circuit to groundl short circuit to pOSitive, TCC solenoid, ECM
84Transmission 3rd-2nd control solenoid -circuit malfunctionWiring, control solenoid, ECM
842nd-3rd gear inhibit relay -circuit malfunctionWiring, inhibit relay, ECM
85Engine control module (ECM), PROM -malfunctionPoor connections, incorrect programming, ECM
85Torque converter clutch (TCC) solenoid -stuck ONWiring open circuit/short circuit to ground, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM
86Engine control module (ECM) -analogue! digital converterA/C refrigerant pressure sensor/KSI ECT sensor/fuel pump monitor circuit short circuit to battery voltage
87Engine control module (ECM), EEPROMmalfunctionPoor connections, incorrect programming, ECM
90Torque converter clutch (TCC) solenoid -circuit malfunctionWiring, TCC solenoid, ECM
915kip shift warning lamp -circuit malfunctionWiring, skip shift warning lamp, ECM
93Transmission fluid pressure (TFP) control solenoid -circuit malfunctionWiring, poor connection, TFP solenoid
95Change oil lamp -circuit malfunctionWiring open circuit/short circuit to groundl short circuit to positive, instrument panel, engine oil life lamp bulb, ECM
96Engine control module (ECM) -ignition supply voltage lowWiring open circuit, alternator, ECM
96Engine oil level warning lamp -circuit malfunctionWiring open circuit/short circuit to groundl short circuit to positive, instrument panel, engine oil level lamp bulb, oil level sensor, ECM
97Engine control module (ECM), vehicle speed sensor (VS5) output signal circuit malfunctionWiring, poor connections, ECM
98Engine control module (ECM) incorrectly codedECM incorrectly coded, ECM
99Engine control module (ECM) incorrectly codedECM incorrectly coded, ECM
99Engine control module (ECM), tachometer output signal -circuit malfunctionWiring, poor connections, ECM
  Use of the vehicle wiring diagram is recommended to confirm which components are fitted .
o A/C compressor clutch relay0 Exhaust gas recirculation (EGR) solenoid
o A/C condenser blower motor relay0 Malfunction indicator lamp (MIL)
o Engine coolant blower motor rela 0 Torque converter clutch (TCC) solenoid
o Engine coolant ‘hot’ warning lamp0 Transmission shift solenoids (55)
o Evaporative emission (EVAP) canister purge0 Transmission shift warning lamp (MT) valve