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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.

Vehicle: 2000 GMC Suburban 5.7

5 Answers

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Best answer

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

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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

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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.

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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.

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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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