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What do the codes 34 and 42 stand for for a obd 1 scanner for gm

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Problem code 34 is in map sensor curcuit is to high. code 42 is electronic spark timing malfunction. for 42 replace est module in distributor, it has the est built into it. it controls the timing. code 34-- replacing map sensor should solve problem. good- luck!!

Posted on Oct 09, 2010

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95 buick lesabre check engine light goes on every time i hit passing gear or climb a hill. when i restart car it is off again.

Sorry to say, that is one of those GM cars that is difficult to retrieve trouble codes without special scanners. It was on some '94 and '95 GM luxury or upscale models (your LeSabre was one), where they put in the new diagnostic connector that became standard on all cars built after 1996- and called OBD-2 (for On Board Diagnostics, second generation). The problem is, your '95 model is typical of all early '90's cars and trucks equipped with the OBD-1 system. It only has 2 digit trouble codes, and there are not a lot of them, only about 2 dozen in total. The whole system is OBD-1, but the diagnostic connector is configured like an OBD-2 connector.
Some shops might have the scanners necessary to work on your car, some with high end scanners. Of course, GM dealerships would have the right testers, but they are outrageous in prices.
I would try to find someone who could get the codes for you. What you describe sounds to me a lot like a bad Mass Airflow Sensor, or MAF sensor. That is just a guess, though, and why I recommended you try to see if there are trouble codes. There should be at least one.

Nov 25, 2016 | 1995 Buick LeSabre

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I have no fuses blown under hood or in fuse panel on dash side code scanner will not power up or work at all

With key in on do you have all dash warning lamps on, and the check engine light is on? If that's all okay, and still nothing on the scanner, it is possible the wiring to the diagnostic port got messed up. You would need a wiring diagram to really see the wires involved. By the way what year is your vehicle? All after 1996 have the same obd-2 connector. There were some variations leading up to the '96 model year. I recall some dismayed GM owners of '94 & '95 models, especially luxury class models, that had obd-2 connectors and obd-1 diagnostics, same as all the early '90's GM vehicles. Back then, GM and Chrysler were always a step ahead of Ford, beginning in the early '80's. ! enough nostalgia, did u figure it out with your scanner?

Nov 10, 2015 | Cars & Trucks

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I have a 2001 Dodge Durango reading error codes P1728, P1726, P1787, P1775, and P1727 in that order. Does anyone know what these are and how to go about fixing them?

Most people will eventually learn how to get the codes

You use Google & Type: OBD & your codes

OBD P1728

Sometimes you need a vehicle or engine or year

If your looking for 1995 & earlier, you type OBD 1
or on something like a GM,just GM Codes or GM OBD1
& the code

Codes do not tell you what is wrong or what to do

Codes direct you to the system with the fault
Then you component test to find a problem

Without decades of knowledge & professional tools,
your not working on your own vehicles,except for the
mechanical parts

Aug 22, 2014 | 2001 Dodge Durango

1 Answer

My 1995 chevy k2500 350 manual trans. check engine light will come periodically while i am driving and turn back of sometimes. Any ideas why?

Not without having the computer scanned for trouble codes. If it is OBD 1 you can do it yourself with a paper clip. There is a plug under the dash you jumper to make the light flash the codes. If it is OBD2 you have to use a scanner to read the codes.
You can research "check GM codes" online for the procedure.

Jan 08, 2013 | Chevrolet K2500 Cars & Trucks

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Code reader will not make a connection with the cars computer

do you have a OBD-I reader ! from 96 and before are OBD-I, 96 on up are OBD-II scanners.c hecking trouble codes from your 1994 GM vehicle does not require the use of special equipment, such as a scan tool.

Read more: How to Read Codes Without a Scan Tool on a 1994 GM '

Apr 04, 2012 | 1994 Buick Park Avenue

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Where do you get adaptors for obd on 1989 gmc K 1500


If your GM vehicle has the earlier 12-pin OBD-I connector, then this is the adaptor cable you require to connect an OBD-II scanner your vehicle:

Hope this helps....

Oct 18, 2011 | 1989 GMC Sierra

2 Answers

What kind of code reader should I buy for a 1995 Pontiac Trans Sport car?

May depend on manufacturer date.All domestic vehicles after 96 are OBD II.Some late production 95 models are OBD II. if your diagnostic connector is rounded oval shape its OBD II. If the diagnostic connector is rectangled it's OBD.

Jun 17, 2010 | 1995 Pontiac Trans Sport

3 Answers

OBD 1 and 2 will not communicate with PCM.

a blown fuse will also cause the obd to not communicate

Nov 12, 2008 | 1994 Pontiac Bonneville

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