Tolbers Computer Services
Supporting Residential and Small Business Users Since 1986
General Motors Diagnostic Codes
I've driven General Motors vehicles since 1989. Occasionally it becomes necessary to troubleshoot diagnostic codes from the "Check Engine" light in the Instrument Cluster. For assistance locating engine trouble codes for your particular ECM please consult your GM Dealer.
1991 Buick LeSabre 3.8Litre
OBDI Connector - Jumper pins A and B
Code
Indicates
Extra Information
12
Normal - Self Test
First code displayed when testing.
13
Oxygen Sensor
Open Circuit
14
Coolant Sensor
Low Voltage
15
Coolant Sensor
High Voltage
16
Electrical System - High Voltage
17
RPM Signal
21
Throttle Position TP Sensor
Low Voltage
22
Throttle Position TP Sensor
High Voltage
23
Manifold Air Temp Sensor
Low Voltage
24
Speed Sensor
Dude! Slow down a little?
25
Manifold Air Temp Sensor
High Voltage
26
27
28
29
31
Turbo / Boost Sensor
"Dom! Bring the Turbo-Boost online!"
32
EGR Vacuum Control
Switch to alternate vacuum or use broom.
33
Manifold Air Pressure MAP Sensor
Low Voltage
34
Manifold Air Pressure MAP Sensor
High Voltage
35
Idle Air Control Solenoid
Error! (Get busy, you Air Control solenoid!)
36
Transmission Error
Shift Circuit (PCM Models)
38
39
Torque Converter Clutch Error
41
42
Electronic Spark Timing
Circuit Condition - Open or Short to Ground
43
Electronic Spark Control
44
Oxygen Sensor
Mixture Lean (But not so far it tips over...)
45
Oxygen Sensor
Mixture Rich
46
Power Steering Pressure
47
48
51
PROM Error
Bring alternate date to PROM.
52
CALPAK Error
Whoa. Do they do sliced meats?
53
System Voltage
Over-Voltage. Light's kinda' bright, ain't it??
54
Fuel Pump Voltage Low
55
ECM Error
But... What about Code 12?
59
61
62
63
64
65
66
67
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HERE for more information about these and Cadillac Northstar engine codes.
Steven A. Tolbers - Tolbers Computer Services - Merrifield MN
(218) 765-3399
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