Question about 1999 GMC Yukon

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What does code p0785 mean for 1999 gmc yukon 4x4

Yukon wont pass smog,code p0785 came up.what does that mean&how do i fix it

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  • GMC Master
  • 694 Answers

Your code is a PO785 is a SHIFT TIMING SOLENOID BANK A wich is a transmission code nothing to do with your smog failure so go to your local auto store and buy this product it's called guaranteed to pass this will get u buy the bs emissions test for 10 bucks regards Chris

Posted on Mar 03, 2014

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5 Suggested Answers

Anonymous

  • 3 Answers

SOURCE: 2000 gmc yukon xl 4x4 wont engage

$115 inparts and lobor fixed for me...see my solution posting by clicking on my name.

Posted on Feb 28, 2009

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KEN LaPOINT

  • 1305 Answers

SOURCE: I have a 1999 GMC Yukon Denali, 350 V8. I want to

check in the area above the rim of the oil filter...they're typically located very close to the filter.
k

Posted on Jun 26, 2009

Anonymous

  • 38 Answers

SOURCE: 1999 GMC Yukon seems to backfire once in a while

look for vac leak at egr valve, when cold spray carb cleaner on and see if it speeds up the eng

Posted on Jun 27, 2009

Anonymous

  • 1 Answer

SOURCE: 1999 GMC Yukon - Blower only operates on high. I

on these models on the harness that plugs into the fan switch goes bad, I changed the switch and found this harness melted together on my 99 yukon

Posted on Jul 19, 2009

Daniel Berry

  • 613 Answers

SOURCE: 1999 gmc yukon obd11

ok heres problem 101 is mass air flow sensor 171 running too rich 174 running too lean can find 429 but it the same lines i believe take out your mass air flow sensor and clean it check it connection if comes back on replace the mass air flow sensor

Posted on Sep 24, 2010

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97 GMC YUKON 5.7 4X4, HAS A PO785 CODE......WHEN FIRST STARTED IT SHIFTS AS IT SHOULD. BUT AFTER ITS WARMED UP AND I STOP AT A STOP SIGN I COMPLETELY LOSE OVERDRIVE AND IT WON'T DOWN SHIFT. I HAVE TO...


HERE WE ARE AGAIN STILL SAME ISSUES AFTER CHANGING ALL 5 SOLENOIDS,FLUID,FILTER AND EVEN THE INTERNAL WIRING HARNESS IN 4L60 TRANSMISSION IN A 97 YUKON. STILL GETTING A P0785 CODE. WHEN 1ST STARTED SHIFT PERFECT TILL IT WARMED UP AND I MAKE A COMPLETE STOP. THEN IT WON'T DOWN SHIFT AT ALL AND I HAVE NO OVERDRIVE. HAVE NEVER HAD ANY PROBLEMS WITH TRANS TILL IT STARTED DOING THIS OUT OF THE BLUE. NO SLIPPAGE NO BURNT FLUID EITHER. I'M TOTALLY LOST AND DON'T WHAT ELSE TO DO. CAN ANYONE PLEASE POINT ME IN THE RIGHT DIRECTION? PLEASE EMAIL imhausen72@gmail.com

Sep 25, 2013 | 1997 GMC Jimmy

1 Answer

My 1999 kia sephia wont pass smog test


You will need to get it scanned and get the codes for the problem. If it failed the test due to emissions I would almost guarantee it will be your oxygen sensor or cat

Jul 31, 2012 | 1999 Kia Sephia

1 Answer

My 1999 gmc yukon wont start code say p0336 just rotates


Hi.

p0336 means CKP sensor performance error. Replace the crankshaft position sensor. If that doesn't fix the issue there is a number of GM factory service bulletins that point at a manufacturing problem with Yukon engine. Find the appropriate service bulletin for your engine in this page.

Regards.

Ginko

Sep 20, 2011 | 1999 GMC Yukon

2 Answers

Code 1416 bank 2 2000 gmc jimmy


P1416 - Secondary Air Injection (AIR) system Bank 2
1416 means that you are running lean while the smog pump is on.
It could also be likely the vacswitch on the smog pump is the causes.

Jan 31, 2010 | 2000 GMC Jimmy

1 Answer

Keep getting code p0785. 1999 blazer 4x4


Depends on how handy you are. You'll need to drop the tranny pan and you'll see them all in the valve body. If you're going to go through the effort you might as well change all of them at the same time.

Here's a diagram:

http://z.about.com/d/autorepair/1/0/p/D/78407452.gif

Oct 08, 2009 | 1999 Chevrolet Blazer

1 Answer

2000 gmc yukon xl 4x4 wont engage


$115 inparts and lobor fixed for me...see my solution posting by clicking on my name.

Dec 23, 2008 | 2000 GMC Yukon XL

1 Answer

Need list of fault codes for deawoo lanos 1999


Not a solution: This is my problem...
I needed to get my car smogged, but the check engine light was on. Took to to a local smog station that had replaced a sensor for me in the past in order to pass smog. They could not fix it. Put car in dealership garage for repairs and to date, the transmission module sensor (computer) went out and the ignition sensor was out also. The mechanic replaced both and now the code P1702 comes up. What does that code mean? My car still won't pass smog....

Aug 06, 2008 | Daewoo Lanos Cars & Trucks

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