Question about GMC K1500
Overdrive servo/ solenoid is not operational , either from failed unit or wiring problem
check transmission actuator for operation or adjustment as well
Posted on Jul 07, 2017
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Posted on Jan 02, 2017
transmission shift solenoid is stuck open this is a common vehicle issue in automatics and not particular to any make or model vehicle 15 dollar part and arm and leg for labor if taken in
heres an idea to try
take out the transmission filter and replace with new one make sure to take not of any metal debry in trans pan this indicates the trans had sheered its gears down and a trans rebuild is needed
the transfilter needs to be changed at a certain milage interval they can get clogged up
there is a kit you buy for your truck at any parts store
its an easy change hour of time unbolt trans pan unbolt trans filter and put new one in
kit comes with new seals less than an hour you can do it yourself
to overdrive you would feel a difference in shift badley if it was that something to keep in mind
Posted on Dec 06, 2008
SOURCE: '03 suburban transmission
It might fix the problem but you may also have a shift sensor that is starting to go bad as well take you suburban to autozone or an o'reillys if you have one of those auto parts stores near you and they can do a scan on all the sensors to tell you if your vehicle is showing any problems with any of your sensors I hope this helps you out.
Posted on Jan 30, 2009
The forward clutch control valve has a retaining clip that is known to break on these tranny's. This can prevent it from shifting into 4th gear. Good news, the part is five bucks. Bad news, it's in the valve body which takes a few hours to get to. I fixed mine in about 8 hours thanks to great step by step instuctions I found online. Search for "valve body removal taurus tranny". If it's not the retainer clip then it could be one of the solenoids on the valve body. I believe there's one just for 3rd and 4th gear. Good luck
Posted on Sep 18, 2009
Check the transmission fluid level to make sure it's at the proper level. Have a transmission shop determine with a scanner that if it's your 3-4 solenoid or the wire harness has gone bad and will need to be replaced. You have a 4L60E transmission and this is common if your Throttle Position Sensor (TPS) is faulty and needs to be replaced, easy fix, just replace the TPS on the throttle body. Your Electronic Pressure Control valve EPC is faulty due to dirt from dirty transmission oil and filter, or the solenoid has gone bad or the wire harness on the passenger side by the catalytic converter has gone bad from corrosion or loose. Try disconnect the wire harness on that side and cleaning it out with break parts cleaner and reattaching it to see if that helps before you drop the transmission pan to get to the solenoid. The solenoid is around $45.00 and take about 10 min to replace once the transmission pan is replaced so this should cost around $150.00 repair with the oil and filter replaced also have them replace the boost valve "$45.00" with a 0.490" boost valve to bring up the transmission line pressure to help you get more life from your transmission and should be replaced every 60,000 miles as a part of the transmission service. Good luck and keep me posted, be glad to help you get your transmission running 100% again soon.
Posted on Jan 05, 2010
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