GMError.pdf

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GENERAL MOTORS CORPORATION
ECM DIAGNOSTIC CODE INDICATION(S)
12
13
14
15
16
16
17
18
18
19
19
20
21
22
23
23
23
24
25
25
25
26
26
27
27
28
28
29
30
30
Diagnostic mode / ECM functioning No distributor pulses
Oxygen sensor signal problem or loss
Coolant sensor - high temperature fault
Coolant sensor - low temperature fault
System over voltage - over 17.1 volts
DIS fault
Crank signal circuit shorted (or bad ECM)
Crank signal circuit open (or bad ECM)
Cam/crank sensor synchronization error
(DIS)
Fuel pump circuit shorted
Crankshaft position sensor fault (1988-1991)
Fuel pump voltage high, circuit open
TPS voltage high
TPS voltage low
M/C solenoid fault
(Carbureted)
MAT sensor Low temperature fault
(EFI/TPI/SFI)
EST bypass circuit fault
(Cadillac DFI)
VSS loss of signal
MAT sensor High temperature fault
(EFI/TPI/SFI)
Modulated displacement failure
(1981 Cadillac V8-6-4)
EST circuit fault
(Cadillac HT4100)
Quad driver circuit
(3.8L)
Throttle switch circuit shorted
Throttle switch circuit open
Gear switch diagnosis
Gear switch diagnosis
PSM check
(4L80-E Transmissions)
Gear switch diagnosis
ISC fault
(Cadillac TBI)
RPM error
(Cadillac MFI)
31
31
31
31
31
31
31
32
32
32
33
33
34
34
35
35
35
36
36
36
36
36
37
37
38
38
38
39
40
41
Turbo over-boost fault
(Turbo only)
Park/Neutral switch fault
(3.3L V-6)
MAT sensor circuit fault
(Cadillac DFI)
Canister purge solenoid fault
Camshaft sensor circuit fault
EGR circuit fault
(1988-1991 TBI)
MAP sensor circuit shorted
BARO sensor circuit shorted
(Carbureted)
EGR circuit fault
(EFI/TBI)
MAP sensor circuit open
MAP sensor voltage low - pressure low/vacuum high
MAF signal low - flow high
(EFI/TPI/SFI)
MAP sensor voltage high - pressure high/vacuum low
MAF signal high - flow low
(EFI/TPI/SFI)
ISC fault
(Carbureted)
IAC fault
(EFI/TPI/SFI)
BARO sensor circuit shorted
(Cadillac DFI)
MAF sensor burn-off circuit failure
DIS fault
Transaxle shift control
(1991+)
Closed throttle shift control
(1991+)
BARO sensor circuit shorted
(Cadillac DFI)
MAT sensor voltage low or shorted
(Cadillac HT4100)
MAT sensor high temperature
(1984-86)
MAT sensor voltage high or open
(Cadillac HT4100)
MAT sensor low temperature
(1984-86)
Brake input circuit failed (brake light switch)
TCC failure
Power steering pressure switch fault
EST circuit failure - no distributer pulses
41
41
42
42
43
43
43
43
44
45
46
46
46
47
47
48
48
49
51
52
53
53
53
53
54
54
55
55
55
56
56
56
Camshaft position sensor failure
Cylinder select error
EST circuit grounded (HEI module failure)
Front oxygen sensor lean error
(Cadillac MFI)
ESC control failure, spark retard too long
TPS out of adjustment
Knock sensor signal
Front oxygen sensor rich error
(Cadillac MFI)
Oxygen sensor lean error
Oxygen sensor rich error
Power steering pressure switch fault
(4 cylinder)
VATS alert
Right/left fuel balance error
(Cadillac DFI)
ECM failure
A/C clutch and Cruise Control circuit
Misfire diagnosis
EGR fault
(Cadillac)
MAP sensor low error
ECM, PROM, or MEM-CAL failure
ECM or CALPAK failure
System over voltage - over 17.1 volts
EGR sensor fault, improper EGR vacuum
(Carbureted)
Distributor signal fault
(Cadillac HT4100)
VATS alert
(5.0L TBI)
Fuel pump voltage low (below 2 volts)
(EFI/TPI/SFI)
M/C solenoid failure
(Carbureted)
ECM failure (poor connections or failed ECM)
Oxygen sensor failure
Fuel lean monitor error
(Corvette 5.7L P)
Vacuum sensor circuit
(Corvette Port throttle system)
Coolant level low
Quad driver B circuit
(3.8L)
56
58
58
60
61
61
61
62
62
62
63
63
63
64
64
64
65
65
65
65
66
66
67
67
68
68
69
69
70
71
72
73
VATS alert
(Cadillac)
PASS key fuel enable circuit
VATS alert
Transmission not in drive
(Cadillac)
Oxygen sensor failure
Cruise Control vent valve solenoid fault
(3.8L)
Secondary part throttle valve
(Corvette Port throttle system)
Transaxle gear switch
(3.1L V6, Quad 4)
Oil temperature sensor fault
(Corvette 5.7L P)
Cruise Control vacuum circuit fault
(3.8L)
MAP sensor voltage high, low vacuum/open circuit
(2.8L)
EGR flow check
(3.8L)
Right side oxygen sensor open error
(Corvette 5.7L P)
MAP sensor voltage low - high vacuum/short circuit
(2.8L)
EGR flow check
(3.8L)
Right side oxygen sensor lean error
(Corvette 5.7L P)
Fuel injection circuit fault
(Quad 4)
EGR flow check
(3.8L)
Cruise Control servo position sensor fault
(3.8L)
Right side oxygen sensor rich error
(Corvette 5.7L P)
A/C pressure switch low pressure
(1991 +)
ECM fault
Cruise Control switch failure
A/C pressure switch low pressure
(Chevrolet)
A/C relay circuit fault
(Chevrolet)
Cruise Control system fault
A/C clutch circuit fault
(Chevrolet)
A/C pressure switch high pressure
Intermittent TPS signal
(Cadillac)
Intermittent MAP sensor signal
(Cadillac)
Gear selector switch fault
(Chevrolet)
Intermittent coolant sensor signal
(Cadillac)
74
75
80
80
81
82
83
84
85
85
Intermittent MAT sensor signal
(Cadillac)
Intermittent VSS signal
(Cadillac)
TPS idle learn mode
(Cadillac 4.6)
Fuel system rich
(Cadillac)
Camshaft position sensor reference fault
(Cadillac)
Camshaft position reference signal high
(Cadillac)
*Reserved
*Reserved
Idle throttle angle too high
(Cadillac)
TBI service required
(Cadillac)
88
95
99
107
108
109
110
112
ECM fault (‘85 & up)
Engine stall detected
(Cadillac)
Power management, Cruise Control fault
(Cadillac)
PCM /BCM data link defect
PROM checksum error
PCM memory reset
(Cadillac)
Generator ‘L’ terminal circuit fault
(Cadillac)
EEPROM failure
(Cadillac)
131/132 Knock sensor failure
(Cadillac)
A/C
BARO
BCM
Air Conditioning
Barometric sensor (Carbureted engine MAP)
Basic Control Module
MAF
MAP
MAT
Mass Air Flow sensor
Manifold Absolute Pressure sensor
Manifold Air Temperature sensor
CALPAK Calibration Package (early PROM substitute)
CTS
DFI
DIS
ECM
Coolant Temperature Sensor
Digital Fuel Injection
Distributorless Ignition System
Electronic Engine Control Module
MEM-CAL
Memory Calibration module (early PROM substitute)
MFI
M/C
PCM
PROM
PSM
SFI
TBI
TCC
TPI
TPS
VATS
VSS
Multi-port Fuel Injection
Mixture Control servo
Programmable Control Module
Programmable Read-Only Memory module
Pressure Switch Manifold
Sequential multi-pot Fuel Injection
Throttle Body Injection
Torque Converter Clutch
Tuned-Port Induction
Throttle Position Sensor
Vehicle Anti-Theft System
Vehicle Speed Sensor
EEPROM Electrically-Erasable Programmable Read-Only Memory module
EFI
EGR
ESC
EST
HEI
IAC
ISC
Electronic Fuel Injection
Exhaust Gas Recirculation valve
Electronic Spark Control (HEI ignition)
Electronic Spark Timing control
High Energy Ignition distributor module
Idle Air Control
Idle Speed Control
ÎLocate
Diagnostic Connector;
ÏShort
pins ‘B’ & ‘A’;
ÐTurn
ignition key to ‘ON’
(Do not Start!);
ÑRead
‘CHECK ENGINE’ light flashes for code indication;
One flash, pause, two flashes = CODE 12
Three flashes, pause, one flash = CODE 31
Diagnostic connector
All information is complied from General Motors
publications and is correct at time of publication.
©World Wide Data Service, Ltd. Rockford, Illinois USA
®

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