PROBLEM 2008 5 speed auto tranny

This hesitation issue started right after the install of the shift selection sensor ( or neutral safety sensor ) whatever it’s called ? which took care of the stalling issue . So maybe it is a semi faulty SS sensor .Got tired of asking the dealer questions because they really didn’t have an answer . Truck is home . Drove it 90 miles to get home and it shifts fine .

 

I have to be honest at this point, to help with diagnosis, I would LOVE to put the original range sensor in and see if things went back to before. Just as a stepping stone for diagnosis. If there is no delay in engagement, and the engine stalls again the second you put it into drive, then I would lean towards an electrical or software issue over a valve or solenoid issue.

 

I agree but why no codes right now ? That’s the tricky part .Especially if it is electrical . Service manager said there are no software updates for my truck .

 

Sometimes things just don't throw codes...


I chased a TCC valve issue for quite some time in a 4L60E.. No codes..

No scan tool can show what was happening but I could feel it, and no codes..

Pulled valve body and staked the PWM solenoid... No more issues..

 

I doubt my guy has the old sensor now . That was March 9th he swapped it out . I am going to have him order another and try that too .

 

Codes are tricky little monsters. You have to have all of the right conditions to set a code. A CEL won't just come on, or a code won't set, for just any reason. There are parameters which MUST be met before a code will set. Some will come on instantly with the first failure. Others won't come on without two consecutive drive cycles with the failure occurring both times.

 

Just spoke to my mechanic who swapped out the sensor and he said when he took it off it broke apart corroded. Was rusted to the transmission . He cleaned everything up and installed new sensor March 9 ,that got rid of stalling but gave it the sometime delayed engagement . He seems to think the problem is interal as does Toyota . Anyway next Friday adding new filter and Lubegard ,wish me luck !He will try and warranty the sensor and get another as a last resort but he doubts that’s the issue

 

If the sensor was in that bad of shape I would be concerned with the condition of the connector for the terminal. Perhaps a terminal has a corrosion issue inside the connector, or a terminal is slightly spread out making a bad connection? Just thoughts that should definitely be inspected.

 

Yes we will be checking that too . Also I just remembered a few weeks ago that the key can be removed from the ignition while the truck is running ! Isn’t there a connection between that and gear shifter ?

 

This Guy here ?

 

What about the shift lock ECU . I’m able to remove the key from the ignition while it’s running ??? Could that be my problem ?

 

Try another less worn key?

 

Going crazy waiting for Friday . Delayed engagement seem to happen mostly around the 4th or 5th time I move the shifter from P to D . Some days I will go 10 -12 miles and park a couple times and it doesn’t do it . Sometimes I drive 1 mile to the PO and it does it .

 

My mechanic wants to do the pan drop and new filter before trying a new sensor . Kind of figured that . Been reading up on transmissions and this could be as simple as a clogged filter . Which to me sounds like too many metal filings but I am no mechanic . What else would clog up the filter .

 

Swapped out my FOB and my key ,had spares from when I purchased the truck . Key stays in ignition

 

Just did about 40 miles stopped and parked 4 times . Hesitation only once out of those 4 times parking .

 

Today hesitated about 5 times moving from P toD . Drove about 40 miles . Tomorrow’s the pan drop .

 

Suspecting it may be the plug from the sensor . Not sure where that plug goes ?

 

The new sensor was not adjusted properly ,unbelievable . I told my guy that could be it and he said he doubted it . But when he pulled it in his shop it delayed going in drive so he plugged in his fancy machine and figured it out . After all the digging around I did it was that simple . Been a day and a half now with no delayed engagement. Still going to drop pan and put a new filter in with some Lubegard next week for good measure .Thanks for your help . Hopefully this is the last problem