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GM Trouble Code Info

Accessing Trouble Codes

 

  • Turn ignition switch to OFF position
  • Locate Data Link Connector (DLC), see image below.
  • Jumper the A&B terminals(a paper clip or a jumper wire work ok)
  • Turn Ignition switch to ON position.
  • Count the flashes on the "CHECK ENGINE" or "SERVICE ENGINE" light.
  • FLASH, pause, FLASH, FLASH = code 12
  • NOTE: Some 94 & 95 models do not have the B terminal. In which case a scanner is required.
  • NOTE: Some 94 & 95 models that DO have the A & B terminals still require a scanner.
  • All vehicles after 96 are OBDII,and require a scanner to access them.

GM Data Link Connector

12 Pin DLC

A - Ground
F - TCC
B - Test Terminal
G - Fuel Pump
C - Air Injection
H - Brake Sense Speed Input
E - Serial Data
M - Serial Data

Clearing Trouble Codes

Diagnostic trouble codes may be cleared by disconnecting the battery ground cable for at least 20 seconds. Reconnect negative battery cable and recheck codes to confirm the repair.

Diagnostic Codes

Select your Vehicle or look below for Generic codes.
Year
Eng
 8th digit of the VIN Number
82-83
2.5L
 All
82-83
3.0L
All
86
1.8L
 Multi Port Fuel Injection, VIN J
86
1.8L
 Throttle Body Injection, VIN 0
86
2.0L
 Throttle Body Injection, VIN P
86
2.5L
 Throttle Body Injection, VIN 2
86
2.8L
 Carb, VIN X
86
3.8L
 Fuel Injection, VIN B
86-87
3.8L
 Carb, VIN A
86-87
4.1L
 4.1L Fuel Injection, VIN 8
86-87
5.0L
 5.0L Carburetor, VIN 9
86-88
2.5L
 Throttle Body Injection, VIN U
86-88
2.5L
 Throttle Body Injection, VIN R
86-88
2.8L
 Multi Port Fuel Injection, VIN 9
86-88
3.0L
 Multi Port Fuel Injection, VIN L
86-88
3.8L
 Fuel Injection, VIN 7
86-88
3.8L
 Fuel Injection, VIN 3
86-88
5.0L
 Carburetor, VIN H
86-88
5.0L
 Carburetor, VIN G
86-88
5.7L
 Fuel Injection, VIN 8
86-88
5.7L
 Carburetor, VIN 6
86-89
2.8L
 Multi Port Fuel Injection, VIN W
86-89
2.8L
 Multi Port Fuel Injection, VIN S
86-89
5.0L
 Fuel Injection, VIN F
86-90
4.3L
 Throttle Body Injection, VIN Z
87-88
2.0L
 Throttle Body Injection, VIN 1
87
2.8L
 Throttle Body Injection VIN R
87-88
4.1L
 Multi Port Fuel Injection, VIN 7
87-90
2.0L
 Multi Port Fuel Injection, VIN M
87-90
5.0L
 Carb, VIN Y
87-91
2.0L
 Throttle Body Injection, VIN K
88-89
2.3L
 Multi Port Fuel Injection, VIN D
88-89
3.1L
 Multi Port Fuel Injection, VIN T
88-89
4.5L
 VIN 5
88-90
3.8L
 VIN C
88-93
5.0L
 Throttle Body Injection, VIN E
89
2.0L
 Throttle Body Injection, VIN 1
89
2.3L
 Multi Port Fuel Injection, VIN A
89
3.1L
 Multi Port Fuel Injection, VIN V
89
5.7L
 VIN 8
89-90
5.7L
 Throttle Body Injection, VIN 7
89-95
5.7L
 VIN K
89-91
2.5L
 Throttle Body Injection, VIN R
89-91
3.3L
 Multi Port Fuel Injection, VIN N
90
2.3L
 Multi Port Fuel Injection, VIN D
90
2.3L
 Multi Port Fuel Injection, VIN A
90
3.8L
 VIN L
90
4.5L
 VIN 3
90
5.7L
 VIN J
90-91
2.2L
 Throttle Body Injection, VIN G
90-91
3.1L
 Multi Port Fuel Injection, VIN V
90-91
5.0L
 VIN F
90-91
5.7L
 VIN 8
91
2.3L
 Multi Port Fuel Injection, VIN D
91
2.3L
 Multi Port Fuel Injection, VIN A
91
3.8L
 VIN C
91
3.8L
 VIN L
91
4.9L
 VIN B
91
5.7L
 Throttle Body Injection, VIN 7
91
5.7L
 VIN J
91-92
1.9L
 Throttle Body Injection, VIN 9
91-92
1.9L
 Single Port Fuel Injection, VIN 7
91-92
3.4L
 Multi Port Fuel Injection, VIN X
92
2.0L
 Multi Port Fuel Injection, VIN H
92
2.2L
 VIN 4
92
2.3L
 Multi Port Fuel Injection, VIN D
92
2.3L
 Multi Port Fuel Injection, VIN A
92
2.3L
 Multi Port Fuel Injection, VIN 3
92
2.5L
 Throttle Body Injection, VIN R
92
5.0L
 VIN F
92
5.7L
 Throttle Body Injection, VIN 7
92
5.7L
 VIN J
92
5.7L
 VIN 8
92-93
3.3L
 Multi Port Fuel Injection, VIN N
92-93
3.8L
 general & Supercharged
92-93
4.3L
 Throttle Body Injection, VIN Z
92-93
4.9L
 VIN B
92-93
5.7L
 VIN P
92-95
3.8L
 VIN L
93
2.0L
 Multi Port Fuel Injection, VIN H
93
2.2L
 VIN 4
93
2.3L
 Multi Port Fuel Injection, VIN D
93
2.3L
 Multi Port Fuel Injection, VIN A
93
2.3L
 Multi Port Fuel Injection, VIN 3
93
2.5L
 VIN A
93
3.1L
 Fuel Injection, VIN T
93
5.7L
 Throttle Body Injection, VIN 7
93
5.7L
 VIN J
93-94
1.9L
 Throttle Body Injection, VIN 9
93-95
1.9L
 VIN 7
93-95
3.4L
 VIN X
93-95
3.4L
 VIN S
93-95
4.3L
 VIN W
93-95
4.6L
 VIN Y
93-95
4.6L
 VIN 9
94
2.0L
 Multi Port Fuel Injection, VIN H
94
2.2L
 VIN 4
94
2.3L
 Multi Port Fuel Injection, VIN D
94
2.3L
 Multi Port Fuel Injection, VIN A
94
2.3L
 Multi Port Fuel Injection, VIN 3
94
3.1L
 Multi Port Fuel Injection, VIN T
94
5.7L
 VIN P
94-95
3.1L
 VIN M
94-95
4.3L
 VIN Z
94-95
4.9L
 VIN B
94-95
5.7L
 VIN J
94-95
6.5L
 6.5 Diesel
95
1.9L
 Throttle Body Injection, VIN 8
95
2.2L
 VIN 4
95
2.3L
 Multi Port Fuel Injection, VIN D
95
5.7L
 VIN P
96
5.7L
 VIN P OBDII
96
5.7L
 VIN 5 OBDII
96
6.5L
 6.5L Diesel
97
6.5L
 6.5L Diesel

GM Generic Codes

Without Onboard Diagnostics (OBD-II)
12 Diagnostic mode 44 O2 sensor (lean exhaust)
13 O2 sensor or circuit 45 O2 sensor(exhaust rich)
14 coolant sensor/high temp 46 vehicle anti-theft system
15 coolant temp/low temp 47 air condition clutch and cruise circuit
16 system voltage high (3.8L) DIS circuit 51 PROM,MEM CAL or ECM problem (3.1L)
17
  • crank signal circuit
  • ECM fault crank position sensor circuit (3.8L)
 52 CALPK or ECM problem (3.1L)
18
  • crank signal circuit
  • ECM fault injector circuit (vin P-5.7L)
53
  • system overvoltage
  • EGR system (carb models)
  • alternator out of range
19
  • fuel pump circuit(shorted)
  • crank position sensor(88-91)
54
  • fuel pump circuit
  • EGR fault (3.8L)
20 fuel pump circuit (open) 55 O2 sensor or ECM
21 TPS circuit 56 vacuum sensor Quad drvier B (3.8L)
22 TPS out of adjustment 58 Trans code-TTS temp high
21/22 grounded WOT circuit 59 Trans code-TTS temp low
23
  • MAT circuit
  • IAC sensor (95 models)
61 O2 sensor signal faulty
24 vehicle speed sensor 63 MAP sensor voltage high
25 MAT circuit 64
  • MAP sensor voltage low
  • RH side O2 sensor lean
26
  • Quad driver circuit
  • Throttle switch shorted
 65 RH side O2 sensor rich
27 throttle switch open 66
  • 3-2 Control solenoid circuit fault(4L60-E)
  • A/C pressure sensor circuit out of range
28 Transmission range pressure switch 67 TCC solenoid circuit (4L60-E)
31
  • park/neutral switch
  • cam sensor circuit
  • EGR circuit (88-90)
  • MAP sensor (shorted)
 68 O/D ratio error (4L80-E)
32
  • BARO sensor circuit(carb models)
  • EGR circuit(injected models)
  • MAP sensor(open)
 69
  • TCC stuck on (4L60-E &4L80-E)
  • A/C head pressure switch circuit
33
  • MAP sensor(low vacuum)
  • MAF sensor
  • MAP sensor(voltage high)
72 VSS circuit loss transmission output signal
34
  • MAP sensor(voltage low)
  • MAF sensor
 73 trans pressure control solenoid
35
  • IAC valve or circuit
  • idle speed control circuit(shorted)
74 Trans input speed error (4L80-E)
36
  • MAF sensor
  • DIS system(quad 4)
  • transaxle shift control (3.8L)
75 system voltage low
37
  • MAT sensor temp high (3.8L)
  • brake switch(4L60-E trans)
 79 Transmission fluid temp high
38
  • brake input circuit
  • MAT sensor temp low(84-86)
 81 transmission 2-3 error
39

TCC knock sensor shorted(4.3L)

 82 transmission 1-2 error
40 power steering pressure switch 83 TCC solenoid circuit fault
41 faulty ignition module cam sensor (3.8L) 85 undefined gear ratio
42 EST circuit 86 low gear ratio error
43
  • ESC circuit
  • knock sensor signal
87 high gear ratio error

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