Question about Cars & Trucks
Did fluid exchange now wont shift up from 1 to 2 starts out in 2 or 3 but dash lights odometer and PRND321 also not lit up
Did you remove the shift cable off the transmission, if you did that cable it not is the right spot. hope you did not touch the neurtral safety switch
Posted on Dec 07, 2012
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Posted on Jan 02, 2017
Hi :) Sound like a rebuild is coming. The transmission in that truck is 4L60-E and they have a habit of doing this from ware. What happen's is that the pressure regulator and boost valves get sloppy in the pump and the pressure drops and burns out the 3-4 clutch pack and another thing that can happen if there is not any burnt smell to the fluid is a steel 1/4 inche ball could have got stuck in the valve body seperator plate and is not allowing fluid pressure against the 3-4 clutch pack piston.Take it in to transmission specialist he might be able to save it.
Posted on Mar 21, 2011
You will have to have the dealer reset the security light to restart vehicle.Check all engine and chassie grounds because this is where the lighting would exit the vehicle.It sounds like a ground burnt through.
Posted on Jul 20, 2009
you may be confusing the torque converter clutch engagement with o.d. this trans has a problem with the T.C.C. regulator valve wearing out the valve body bore. this will cause the converter clutch to engage only sometimes or not at all. this will set a P1870 code in the control module. when this code is stored in the controller, ( check engine light may or may not be on), it increases the pressure in the transmission causing the 1-2 shift to be harsh. ask a local tranny shop to scan the vehicle ( most will do this for free) if this is the problem they can either fix your valve body (sonnax parts) or replace it with an upgraded valve body. hope this helps
Posted on Dec 16, 2009
Diagnostic trouble code P1870 (Transmission Component Slippage) is a
General Motors-specific code whose set parameters are determined by
transmission type and engine size. The PCM monitors and compares engine
speed to vehicle speed after the converter clutch has been commanded ON
in either high gear or Overdrive. Should the expected rpm ratio exceed
predetermined parameters, DTC 1870 sets. And upon doing so, the PCM
elevates the transmission main line pressure and stops converter clutch
Once the vehicle has made it to a cruise state, the PCM then begins to monitor the vehicle's cruise ratio. If at some point the transmission begins to slip, P1870 sets and line pressure is elevated in an attempt to stop any further slippage and prevent further damage. This would explain why DTC 1870 Ls often accompanied by a complaint of a hard 1-2 up shift.
When this code sets, it could have any number of causes, ranging from the sump running low of fluid to a malfunctioning torque converter. Take a GM 4L60-E transmission, for example. When it's in Overdrive, the forward clutch and the 3-4 clutches are applied, as well as the 2-4 band. Now add the converter clutch. This is what the PCM monitors at cruise. If the ratio breaks away, the cause could be any of three components, the hydraulics that operate them or the electronics that control them. Fortunately, experience has shown that in most cases, the cause can be traced to some form of converter clutch failure as a result of valve body concerns. With GMs 4L80-E transmission, this code has usually been the result of a cracked converter clutch piston.
Put a line pressure gauge ($55 shipped on Ebay, or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.049" - 0.500" boost valve (easy fix in pan), and replace the servo with an upgrade servo from a Corvette 4L60E. This will give you a more firm shift and address the DTC 1870 which is common to a weaken Boost valve or faulty EPC valve.
Posted on Jan 07, 2010
0753 is shift solenoid A, electrical problem.as for the other codes they should start with a zero not a one. if they started with a 0757 that means shift solenoid B,stuck in on position. 0762 means shift solenoid C,stuck in on position. 0765 means shift solenoid D,malfunction
Posted on Feb 15, 2010
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