GM GM 94-95 6.5L VIN P, Y, F, S Trouble Code Info

GM

 
94-95 6.5L VIN P, Y, F, S
Flash Code Fault Location Probable Cause
12 Start of diagnosis No engine speed (RPM) signal received
13 Fuel shut-off solenoid -circuit malfunction Wiring open circuit, fuel shut-off solenoid, ECM
14 Engine coolant temperature (ECT) sensor -voltage low Wiring, ECT sensor, ECM
15 Engine coolant temperature (ECT) sensor -voltage high Wiring open circuit, ECT sensor, ECM
16 Vehicle speed sensor (VSS) -no/low signal Wiring, VSS, ECM
17 Injection pump position sensor, high resolution -circuit malfunction Wiring, injection pump position sensor, ECM
18 Injection pump position sensor, low resolution -circuit malfunction Wiring, injection pump position sensor, ECM
19 Crankshaft position (CKP) sensor -circuit malfunction Wiring, CKP sensor, ECM
21 Accelerator pedal position (APP) sensor 1 -voltage high Wiring, APP sensor, ECM
22 Accelerator pedal position (APP) sensor 1 -voltage low Wiring, APP sensor, ECM
23 Accelerator pedal position (APP) sensor 1 to 2/ 3 -signal variation Wiring, APP sensor, ECM
24 Vehicle speed sensor (VSS) -no signal Wiring, VSS, ECM
25 Accelerator pedal position (APP) sensor 2 -voltage high Wiring, APP sensor, ECM
26 Accelerator pedal position (APP) sensor 2 -voltage low Wiring, APP sensor, ECM
27 Accelerator pedal position (APP) sensor 2 to 1/ 3 -signal variation Wiring, APP sensor, ECM
28 Transmission gear pressure switch, signal -circuit malfunction Wiring open circuit/short circuit to ground, reverse/D1/D2/D3/D4 gear pressure switch(es), ECM
29 Glow plug relay -circuit malfunction Wiring, glow plug relay, ECM
31  Exhaust gas recirculation (EGR) vacuuml barometric pressure (BARO) sensor -voltage low Wiring, EGR vacuum/BARO sensor, ECM
32 Exhaust gas recirculation (EGR) system malfunction  Wiring, vacuum pipes, EGR vacuum sensor, EGR valve
33 Exhaust gas recirculation (EGR) vacuum/ barometric pressure (BARO) sensor -voltage high    Wiring, EGR vacuum/BARO sensor, ECM
34  Fuel injection timing, command/actual -signal variation  Wiring, fuel injection timing actuator, ECM
35  Fuel injection duration -pulse width signal shorter than expected  Wiring, fuel injection duration control solenoid, fuel injection pump control module, ECM
36  Fuel injection duration -pulse width signal longer than expected  Wiring, fuel injection duration control solenoid, fuel injection pump control module, ECM
37 Brake pedal position (BPP) switch -stuck ON  Wiring, BPP switch, ECM
38 Brake pedal position (BPP) switch -stuck OFF  Wiring, BPP switch, ECM
39 Brake pedal position (BPP) switch -stuck OFF  Wiring, BPP switch, ECM
41 Brake pedal position (BPP) switch, torque converter clutch (TCC) -circuit malfunction Wiring, BPP switch, ECM
42 Fuel temperature sensor -voltage low  Wiring, fuel temperature sensor, ECM
43 Fuel temperature sensor -voltage high  Wiring, fuel temperature sensor, ECM
44 Exhaust gas recirculation (EGR) valve circuit malfunction  Wiring, fuses, EGR valve
45 Exhaust gas recirculation (EGR) vent valve circuit malfunction  Wiring, fuses, EGR vent valve
46 Malfunction indicator lamp (MIL) -circuit malfunction  Wiring, fuses, MIL
47 Intake air temperature (IAT) sensor -voltage low  Wiring short circuit to ground, IAT sensor, ECM
48 Intake air temperature (IAT) sensor -voltage high  Wiring, IAT sensor, ECM
49 Service throttle soon warning lamp -circuit malfunction  Wiring, fuses, service throttle soon warning lamp
51 Engine control module (ECM), PROM malfunction  Poor connections, incorrect programming ECM
52 System voltage -high  Alternator, jump started
53 System voltage -high  Alternator, jump started
54 Engine control module (ECM) -malfunction  Check trouble code 17, if not: replace ECM
56 Fuel injection pump calibration resistor circuit malfunction  Wiring, calibration resistor
57 Engine control module (ECM), sensor supply voltage -circuit malfunction Wiring short to ground, poor connections, MAP sensor
58 Transmission fluid temperature (TFT) sensor -voltage low Wiring short circuit to ground, TFT sensor, ECM
59 Transmission fluid temperature (TFT) sensor -voltage high Wiring open circuit, TFT sensor, ECM
61 Turbocharger (TC) boost pressure sensor -voltage high Wiring, TC boost pressure sensor, ECM
62 Turbocharger (TC) boost pressure sensor -voltage low Wiring short circuit to ground, TC boost pressure sensor, ECM
63 Accelerator pedal position (APP) sensor 3 -voltage high Wiring, APP sensor, ECM
64 Accelerator pedal position (APP) sensor 3 -voltage low Wiring, APP sensor, ECM
65 Accelerator pedal position (APP) sensor 3 to 1/ 2 -signal variation Wiring, APP sensor, ECM
66 Transmission 3rd-2nd control solenoid -circuit malfunction Wiring, control solenoid, ECM
67 Torque converter clutch (TCC) solenoid -circuit malfunction Wiring, TCC solenoid, ECM
69 Torque converter clutch (TCC) solenoid -stuck ON Wiring open circuit/short circuit to ground, transmission internal wiring, TCC solenoid, transmission mechanical fault, ECM
71 Cruise control, set/coast switch -circuit malfunction Wiring, poor connections, set/coast switch
72 Vehicle speed sensor (VSS) -loss of signal Wiring, VSS, ECM
73 Transmission fluid pressure (TFP) control solenoid -circuit malfunction Wiring, poor connection, TFP solenoid
74 Transmission input shaft speed sensor -circuit malfunction Wiring, input shaft speed sensor, ECM
75 System voltage, engine control module (ECM) -low Wiring, battery, alternator, ECM
76 Cruise control, resume/acceleration switch -circuit malfunction Wiring, poor connections, resume/ acceleration switch
78 Turbocharger (TC) wastegate regulating valve -circuit malfunction Wiring, TC wastegate regulating valve, ECM
79 Transmission fluid temperature (TFT) -high Transmission mechanical fault, towing weight limit exceeded
81 Transmission shift solenoid (SS), 2nd-3rd -circuit malfunction Wiring, SS, ECM
82 Transmission shift solenoid (SS), 1st-2nd -circuit malfunction Wiring, SS, ECM
83 Torque converter clutch (TCC) solenoid, pulse width modulated -circuit malfunction Wiring, TCC solenoid, ECM
84 Accelerator pedal position (APP) sensor 1/2/ 3 -intermittent circuit malfunction Wiring, poor connections, APP sensor
85 Transmission input/output shaft speed, ratio variation -out of range Wiring, input shaft speed sensor, output shaft speed sensor, mechanical fault
86 Transmission input/output shaft speed, ratio variation -lower than expected Wiring, input shaft speed sensor, output shaft speed sensor, mechanical fault
87 Transmission input/output shaft speed, ratio variation -higher than expected Wiring, input shaft speed sensor, output shaft speed sensor, mechanical fault
88 Fuel injection pump timing -out of range Fuel injection pump timing incorrectly set
91 Power balance, cylinder 1 Check other trouble codes, If not: mechanical fault
92 Power balance, cylinder 2 Check other trouble codes, If not: mechanical fault
93 Power balance, cylinder 3 Check other trouble codes, If not: mechanical fault
94 Power balance, cylinder 4 Check other trouble codes, If not: mechanical fault
95 Power balance, cylinder 5 Check other trouble codes, If not: mechanical fault
96 Power balance, cylinder 6 Check other trouble codes, If not: mechanical fault
97 Power balance, cylinder 7 Check other trouble codes, If not: mechanical fault
98 Power balance, cylinder 8 Check other trouble codes, If not: mechanical fault
99 Accelerator pedal position (APP) sensor 2 – supply voltage low  Wiring, poor connections, APP sensor