GM OBD1 DTC codes for 1995 and older

[unplugged]

These are the GM specific OBD1 DTC codes:

GM common codes for OBD1 (for vehicles made before 1995)
12 System normal
13 oxygen sensor circuit open
14 coolant sensor high resistance or shorted
15 coolant sensor circuit low or open
16 direct ignition system (DIS) fault in circuit
17 cam position sensor fault
18 crank or cam sensor error
19 crank sensor circuit fault
21 tps sensor out of range
22 tps sensor signal voltage low
23 intake air temp sensor out of range, low
24 vehicle speed (vss) sensor circuit fault
25 air temp sensor sensor out of range, high
26 quad-driver module (computer) circuit #1 fault
27 quad-driver module (computer) 2nd gear circuit
28 quad-driver module (computer) circuit #2 fault
29 quad driver module (computer) 4th gear circuit
31 cam position sensor fault
32 egr circuit fault
33 map sensor signal out of range, high
34 map sensor signal out of range, low
35 idle air control sensor circuit fault
36 ignition system circuit error
38 brake input circuit fault
39 clutch input circuit fault
41 cam sensor circuit fault, igntion control circuit fault
42 electronic spark timing (EST) circuit grounded
43 knock sensor
or electronic spark control circuit fault
44 oxygen sensor lean exhaust
45 oxygen sensor rich exhaust
46 pass-key II circuit or ps.pressure switch circuit fault
47 pcm-bcm data circuit
48 misfire diagnosis
51 calibration error, mem-cal, ecm or eeprom failure
52 engine oil temperature circuit, low temperature indicated
53 battery voltage error or egr or pass-key II circuit
54 egr system failure or fuel pump circuit low voltage
55 a/d converter error or pcm not grounded or lean fuel or frounded reference voltage
56 quad-driver module #2 circuit
57 boost control problem
58 vehicle anti-theft system fuel enable circuit
61 a/c system performance or degraded oxygen sensor signal
62 engine oil temperature high temperature indicated
63 oxygen sensor right side circuit open or map sensor out of range
64 oxygen sensor right side lean exhaust indicated
65 oxygen sensor right side rich exhaust indicated
66 a/c pressure sensor circuit low pressure
67 a/c pressure sensor circuit or a/c clutch circuit failure
68 a/c compressor relay circuit failure
69 a/c clutch circuit head pressure high
70 a/c refrigerant pressure circuit high
71 a/c evaporator temperature sensor circuit low
72 gear selector switch circuit
73 a/c evaporator temperature circuit high
75 digital egr #1 solenoid error
76 digital egr #2 solenoid error
77 digital egr #3 solenoid error
79 vehicle speed sensor (vss) circuit signal high
80 vehicle speed sensor (vss) circuit signal low
81 brake input circuit fault
82 ignition control (IC) 3X signal error
85 prom error
86 analog/digital ecm error
87 eeprom error
99 power management

[Johan King]

On obd1 cars you need to change the chip inside the computer, call summit racing or Jeggs to see if one is offered for your engine.

[eagle542807]

anybody got the codes for the 98 GMC 1500 5.7 ... Just asking Thanks Guys. More Checy to ya!

[eagle542807]

Do you have the codes for the 98 GMC 5.7 Vortec

[likeArock]

Cool, thanks

[wis bang]

Do you have the codes for the 98 GMC 5.7 Vortec

'96 & up is OBD II and you need a reader to get them...OBD I you could get w/ a paper clip by making the CES lamp flash 'em...google GM OBD II Codes

[auzivision]

'96 & up is OBD II and you need a reader to get them...OBD I you could get w/ a paper clip by making the CES lamp flash 'em...google GM OBD II Codes

So this ODB ‘scanner’ I bought years ago is just a paper clip in disguise???



That’s too funny… at least having the book with all the codes comes in handy!

[jackal]

A friend of mine just got back from Autozone...They can't scan the OBD 1 vehicles anymore because their scanner doesn't work on them...ha ha...so I whipped out my scanner (paperclip) and did it for him...too funny.

[Wenzler383]

I just got a 1992 C1500, 4.3, with a 5-speed. Every once in a while the check engine light comes on, usually after driving on the freeway, and when I turn the truck off the light doesn't come back on. I went out and bought an OBD1 reader for it, problem is that the truck has to be be off to read the code, and as I previously stated, it stops throwing the code as soon as I turn the truck off. The EGR is plugged off, there's a small leak from the oil sending unit and the truck has 289,000miles and the original cat(OBD1 so no after cat O2 sensor.) Any ideas or suggestions?

[greg1944]

The E C M has a memorie, but you need a Pro reader to re-trive it! My reader cost me $2000 10 years ago! Expensive paper clip!