Sounds like the shifter switch is either gone out of adjustment and/or it has gone bad...but any mechanic should have been able to diag that & replace.
Remote possibility is that the computer network system has an issue and again, a good mechanic should have been able to diag that
Assume the battery has been replaced...and that lead crush washer in the connection stack was NOT replaced, right ?
If so, then consider this fix:
Suburban dilemma GMpostiveBatterySidePost POSBatteryPost
BenK wrote:
Here is the image of the modifications to my Suburban's positive battery post. Just replaced the battery last week and think it is the 4th battery, plus the OEM, so makes five batteries. Two were unnecessary, as it took cracking two batteries to figure out what the heck was going on...
An easy and of little cost to solve a major problem that will drive mechanics nuts...until they finally cut apart the OEM molded plastic surround. NOTE...this has to be done to both OEM cable lug ends...look closely and you will see that both of mine has the molded plastic surround cutaway (can't remember which one had the lead washer in it)
Ask if anyone does this, to take pictures of that lead washer so that I can save it to my files...thanks!
All of the OP's symptoms says to me, that the problem is that lead washer in the OEM plastic surround of the positive cable lug. Mine behaved exactly that way...dying in the middle of the freeway, mystery resets of the computer, appeared to be dead...but wiggling the positive cables had it finally start, etc, etc
Cheaper than buying another vehicle and if this doesn't solve, then proof that the problem(s) are elsewhere...not much to lose in trying this fix
Can't remember the thread, bolt dia or length, but easy enough to figure out.
Finger tighten the bolt, after installing the jam nut and the stack of lugs (mine has an alarm lug in the stack). Back off a half of a turn. Then, while holding the bolt head with a wrench, tighten the jam nut down to secure the stack against the battery connection land.
mysub mysuburban GMbattery batterypost GMBattPost
Snip....
BenK wrote:
This aliment happens to any side post battery that has that lead, crush washer in the connection stack. Ok if left as is from the factory...but...once that connection is loosened and re-tightened...the crush washer will no longer have enough 'crush' to maintain a good connection
Links to threads from one of my forums...ditto solutions from another of my Boy Racer forums, but won't link them here
Note that there are some posts with sleezy stuff and part of why that forum died...freebie and out of pocket ran into better software needs...but not enough of the members pitched to help defer our costs
Andy has since stopped updating this site
Many of the links don't work, but many still do. We discussed many problems and solved most on this reference site to my old Suburban Forum. I'm "Ben" over there
BATTERIES & CHARGING SYSTEM
Sub page to the above site
Positive battery terminal modification
My first post on this GM battery side post discovery and solution. Year 2000, so my Suburban has 17 years with that modification and have NOT had a connection problem since... Hasn't died for unknown reasons (sure the fuel pump has left me stranded a few times and once with ignition module dying). No more mystery computer resets by itself, etc.
battery dies on '99 K2500 7.4L
One of many, many issues from the GM positive lead washer...a shame most didn't believe it back then and that continues to this day here...an approx $5 buck and 1 hour fix vs so many willing to toss their vehicle and spend tens of thousands on an other vehicle
POS Battery - Can someone outline the right steps to take care of it?
A good one representing this thread here
Need Help!!! Sub died!!!
Charging system troubles
how to replace the positive bat. cable
What Happens when they go bad
The INFamous Battery Problem!
How2 to jump start another vehicle without damaging your alternator
While at this...here is the best way to jump another's dead battery WITHOUT killing hour alternator. An another 'again' folks don't believe in this and then come back with a sad story of yet another dying or dead alternator...
