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We have a 1998 chevy blazer and we had my brother in law test the computer with the OBD2 and it read code "PO785" what does it mean

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Shift solenoid malfunction

google "PO785" and you will find more out about it. I saw something about a 3-2 shift

Posted on May 10, 2009

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Posted on Jan 02, 2017

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GM Code PO785 I have Replaced the Wiring and all the solenoids and I am still getting PO785 Code 3-2 Down shift Solenoid ??


What model and year vehicle ? Computer problem maybe . Do you know how to test a PCM driver (transistor) Need a wiring diagram ,pin out of PCM connectors . , need a test light to check an see if the PCM is able to suppy a ground for that shift solenoid to turn on an off .

Sep 02, 2017 | Cars & Trucks

1 Answer

98 chevy blazer has po785 code will not downshift will shift manually


this is a link you can use to help find what you need to repair the shifting problem, by what i'm reading it has more to do with the timing of the ing. switch than it does with the transmission.
http://www.automotiveforums.com/vbulletin/showthread.php?t=287636

Sep 09, 2015 | Cars & Trucks

1 Answer

I got a 1998 chevy blazer 4×4 what does this. Code mean. Co226


  1. 8 ABS codes - Blazer Forum - Chevy Blazer Forums

    blazerforum.com > ... > 2nd Gen S-series (1995-2005) Tech Sep 29, 2009 - It found 8 ABS codesCO225,CO226,CO227,CO242,CO246,CO251 ... to the thread about that year having lots of ABS computer problems.

Jul 18, 2015 | Cars & Trucks

1 Answer

My 1997 chevy blazer failed inspection because the obd is malfunctioning. I'm trying to find the location of the on board computer to see if I can swap it out myself. I would really like to stay away from...


The OBDII / OBD2 connector is 18" from the center of the center console.





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You will need to purchase an OBDII scanner/reader to read these codes.

The alternative method is get a OBD2 cable and a laptop + software to pull the codes.

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An inexpensive OBD2/CAN bus reader around $75-$120 is a good start.
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Did the inspector mention anything about drive cycle or lack of stored readyness fields?

Please email on why it fail. You can append more info by click the button on TOP RIGHT of this page.

Jul 25, 2010 | 1997 Chevrolet Blazer

2 Answers

1998 chevy blazer 4 wheel drive


You need to check the fuel press, the test port in on the rail, also run a code test on the ECM/PCM, this checks for trouble codes and also lets you know the computer is working if it tests ok.

Nov 26, 2008 | 1998 Chevrolet Blazer

1 Answer

1998 Chevy Blazer


It sounds to me as though you may have an alternator concern and when it is running all it using is the battery and will die when the battery runs down.I would charge the battery up and start the truck then using a digital volt meter and take a voltage reading at the battery with the lights on and the engine running it should read between 13.1 volts and 15 volts if it doesnt you probably need an alternator.
Let me know

Jim

Oct 07, 2008 | 1998 Chevrolet Blazer

1 Answer

Engine light


Hi, you'll need to get the codes read from the car's computer memory. You can look up the code here to find out what it means - http://www.engine-light-help.com/chevy-check-engine-light.html

Jul 26, 2008 | 1998 Chevrolet Blazer

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