P1870 GMC - Suburban, Model 2000. I found this (Msg: Transmission Conponent Slipping) that my car push with shaking when changing the gear after driving about 30 minutes or more.
Would you please tell me the solution.
4l80e Slip Code p1870 1999 and later 4l80e application may exhibit excessive TCC slip and in many instances may have a slip related DTC set as with other application several areas can cause the excessive slip condition one of the most common causes on a later model application is crack forming on the TCC apply plate if the typical causes for the condition fail to address the root cause of the condition replace the torque converter
P1870 GMC - Transmission Component Slipping Read more: https://www.autocodes.com/p1870_gmc.html
4l60e slip code p1870
Concern:
P1870 and or, intermittent no TCC
Common Cause:
There are several things that were covered in the seminar in
previous years that may lead to a P1870 DTC. One additional condition that may
cause TCC to be inoperative is the converter clutch valve apply spring. Several
springs have been found to be improperly wound. An improperly wound spring
can catch in the bore, which may prevent the TCC apply valve from moving into
the applied position.
Repair:
The valve should move upward freely for about ½ “. When pressure is
removed the valve should return to the released position. If the valve does not
operate as described, the spring may not be properly wound or the valve and or
bore may be damaged.
Another method is to simply remove the valve and inspect the spring. Look closely
at the ends where the spring is wound correctly.
If it is not properly wound, replace the spring
4l60e p1870
COMPLAINT:
CAUSE:
CORRECTION:
Some vehicles may consistently return, before and/or after rebuild, with "Check Engine"
lamp illuminated and trouble code P1870, (Internal Component Slipping), stored in memory.
The cause is usually Torque Converter Clutch slippage, created by a badly worn valve body
casting in the Converter Clutch Regulator Valve bore.
Sonnax manufactures two different kits to repair the current valve body castings, both of
which require a reamer, also available from Sonnax. One of the kits, Sonnax part number
77754-03K, fits 1993 thru 1997 model transmissions, but they require different assembly
processes. Refer to Figure 1 for the 1994-1994 models and Figure 2 for the 1995-1997
models, for the proper assembly. The other kit, Sonnax part number 77754-04K, fits only the
1998 and later ECCC models, as it is a different calibration. Refer to Figure 3 for proper
assembly of the 1998 and later models. The reamer required is the same for either kit and is
available under Sonnax part number 77754-R2.
Diagnostic trouble code P1870 (Transmission Component Slipping) is a very common
problem on the 4L60E. It sets on all vehicles, and can be difficult to diagnose as it’s
often intermittent. P1870 will set if:
•
TCC is commanded on
TCC duty cycle is at maximum
TCC slip RPM is greater than 130 for longer than 7 seconds
DTCs P0122, P0123, P0502, PO503, P0711, P0712, P0713, P0740, P0753, P0758,
P1810, P1860 aren’t set.
VSS is between 30 and 70 MPH (48–112 KPH)
Speed ratio (engine speed divided by output speed, also known as N/V ratio on
some scan tools) is between 0.69 and 0.88
D4 range is selected
TP is between 9% and 35%
TFT is between 68° F and 266° F (20° – 130° C)
The computer reacts to code P1870 by:
Raising line pressure to maximum
Freezing shift adapts
Inhibiting TCC
Any type of slip in 4
th gear may lead to code P1870. This means a problem with the 3–4
clutch, 2–4 band or the forward clutch could cause this code. So P1870 isn’t just related
to the TCC or TCC operation. Other causes for code P1870 include:
Clutch or servo sealing problems (seals, bushings, shafts, pistons)
Friction material damage or improper stacking
TCC or its feed circuit is leaking
Solenoid problems (hydraulic leakage and low current flow)
TCC pressure regulator valve side-loading in the bore, causing it to stick intermittently.
This results in low TCC apply pressure.
THM 4l60E slip code p1870 set
After rebuild, the vehicle exhibits premature 3-4 clutch failure, sometimes in as little as 2000
miles of use. Usually associated with Police, Taxi, or heavy duty use.
The cause may be, not using the high energy clutch plates, and the thick (.106") steel plates, or
not enough line pressure rise with throttle opening.
Install the latest design 3-4 clutch pack from General Motors that allows the use of the thickest
(.106") steel plates, and requires the following parts:
1. New design 3-4 Apply Ring with shorter legs.
2. New design one piece 3-4 Apply Plate.
3. New Design .106" thick 3-4 Steel Plates, 5 required (See Figure 1).
4. New design high energy 3-4 Friction Plates, 6 required (See Figure 1).
5. New design 3-4 Selective Backing Plate, as they are thinner.
6. Re-install the 3-4 Load Release Springs in the late design stack-up (See Figure 2).
7. Ensure that you have .050"-.070" clutch clearance
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