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GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 27662
Experience:  GM Grand Master Technician 2007. 11 years experience.
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i have a 99 gmc yukon with a trouble code p1870

Resolved Question:

i have a 99 gmc yukon with a trouble code p1870 need answers the code means trans compon. slipping.   my trans shifts great and doesn't slip at all I was told this is just the pressure bleeding off from the converter lockup clutch and to replace the throttle body... is there any easier fix???
Submitted: 3 years ago.
Category: GM
Expert:  GM Tech (Cam) replied 3 years ago.

Welcome, and thanks for using Just Answer. I am Cam, and I will do my best to assist you. When you are finished please click on accept only if you are satisfied. I don't get paid unless you do.Please do not accept if you cannot leave positive feedback. I don't know if you are a tech or a just working on your own vehicle so we may have to fine tune the answer. I only know as much about your problem as you have told me in your post, so my answers will be based on what you tell me so please add all the details you can. About your vehicle, no, replacing the valve body is what the fix is. IF it goes to 100% lock up, you will simply loose the cushion created by a little bit of slip. Bu a little but of slip I mean 5-30 rpm.

#01-07-30-023B: Harsh 1-2 Upshift, SES, MIL, or CEL Illuminated, DTC P1870 Set (Replace Valve Body) - (Mar 22, 2002)

Subject:Harsh 1-2 Upshift, SES, MIL, or CEL Illuminated, DTC P1870 Set (Replace Valve Body)

 

Models:1996 Buick Roadmaster
1996 Cadillac Fleetwood
1999-2000 Cadillac Escalade
1996-2000 Chevrolet Camaro, Corvette
1996-2000 Pontiac Firebird
1996-2000 Chevrolet and GMC Light Duty Truck Models
1996-2000 Oldsmobile Bravada
with 4L60-E Automatic Transmission (RPO M30)
Built Prior to January 15, 2000 (Julian Date 0015)

 


This bulletin is being revised to update VIN Breakpoint Date information and revise the Parts Information table. Please discard Corporate Bulletin Number 01-07-30-023A (Section 07 -- Transmission/Transaxle).


Condition

Some customers may comment on a harsh 1-2 upshift and the Check Engine Light or Service Engine Soon indicator is illuminated.

Diagnosis

 

Typically, these vehicles will have been driven more than 32,000 km (20,000 mi) before this condition occurs.

The scan tool may show a DTC P1870 set as a history code.

A harsh 1-2 shift or DTC P1870, caused by wear in the control valve body, may be difficult to duplicate when the transmission temperature is below 93°C (200°F).

Cause

The condition may be due to wear in the control valve body. This wear occurs in the bore that contains the TCC isolator and regulator valves, and results in poor, or no, TCC apply.

Important:

DTC P1870 is a type B code. The conditions for setting the P1870 DTC must occur on TWO CONSECUTIVE TRIPS (ignition cycles, with a drive cycle) before setting a P1870 history code.
When the conditions for setting DTC P1870 are met (first trip), the PCM commands maximum line pressure and harsh 1-2 shifts are the result.
This may result in a harsh 1-2 shift with no history code if the conditions for setting the DTC required for the second trip are not met, on two consecutive trips (Ignition cycles, with a drive cycle).
When the conditions for setting the DTC are met, on the second consecutive trip, a DTC P1870 is stored as a history code.
When the P1870 code is stored, the PCM will turn on the Service Engine Soon (SES), Check Engine Light (CEL), or Malfunction Indicator Lamp (MIL).

 

Correction

Install a control valve body with the revised TCC regulator and isolator valves. Refer to the Parts Information table below. These valves are used in all transmissions produced after January 15, 2000 (Julian Date 0015), and all of the service parts currently available through GMSPO contain revised TCC regulator and isolator valves.

Important: If all of the following conditions are true, it is not necessary to rebuild the transmission or to replace additional transmission components beyond the control valve body.

Transmission operation is normal before the transmission reaches operating temperature, or before DTC P1870 is set (no slips, flares, or missing gears).
The torque converter is not blue or overheated.
The transmission fluid is not burned or has no burned odor.
The transmission fluid pan contains no abnormal debris (clutch material, bronze, brass, or metal fragments).

 

Parts Information

Model Year

Vehicle Platform

Engine (RPO)

Transmission (RPO)

Transmission Broadcast Code

P/N

1996

S Truck

2.2L

(LN2)

4L60-E

(M30)

SAD

24217855

1996

C Truck

(Mexico)

5.7L

(LO5)

4L60-E

(M30)

CPD

24217856

1996

C/K Truck

G Van

5.0L

(L30)

4L60-E

(M30)

CCD, CFD, KBD, WAD, WBD

24217856

1996

C/K Truck

G Van

5.7L

(L31)

4L60-E

(M30)

CHD, CJD, KCD, CMD, CUD, KPD, YDD, FFD, WCD, WHD

24217857

1996

F Car

Y Car

5.7L

(LT1)

4L60-E

(M30)

FFD, YDD

24217857

1996

D Car

5.7L

(L31)

4L60-E

(M30)

AHD

24217857

1996

S/T Truck

M/L Van

4.3L

(L35)

4L60-E

(M30)

TBD,TAD, MSD, MDD

24217860

1996

C/K Truck

G Van

4.3L

(L35)

4L60-E

(M30)

CAD, CBD, KAD

24217861

1996

S/T Truck

4.3L

(LF6)

4L60-E

(M30)

SHD, TLD

24217862

1996

B Car

4.3L

(L99)

4L60-E

(M30)

BBD, BCD

24217863

1996

B Car

(Includes Police Pkg.)

5.7L

(LT1)

4L60-E

(M30)

BFD, BWD, BKD

24217864

1996

F Car

3.8L

(L36)

4L60-E

(M30)

FCD, FBD

24217865

1997

S Truck

2.2L

(LN2)

4L60-E

(M30)

SAD

24217866

1997

C/K Truck

G Van

4.3L

(L35)

4L60-E

(M30)

CAD, CBD, KAD

24217867

1997

S/T Truck

M/L Van

4.3L

(L35)

4.3L

(LF6)

4L60-E

(M30)

SHD, TLD, TBD, TAD, MSD, MDD

24217868

1997

C Truck

(Mexico)

5.7L

(L31)

4L60-E

(M30)

CPD

24217869

1997

C/K Truck

G Van

5.0L

(L30)

4L60-E

(M30)

CCD, CFD, KBD

24217869

1997

C/K Truck

G Van

5.7L

(L31)

4L60-E

(M30)

CJD, CHD, KCD

24217870

1997

F Car

Y Car

5.7L

(LS1)

4L60-E

(M30)

FFD, YDD

24217870

1997

F Car

3.8L

(L36)

4L60-E

(M30)

CFD, FBD

24217871

1998

C/K Truck

G Van

5.7L

(L31) 5.0L (L30)

4L60-E

(M30)

ADD, AFD, AJD, ALD, AWD, CCD, CFD, KBD, CHD, CJD, KCD

24221155

1998-2000

C/K Truck

G Van

S/T Truck

M/L Van

4.3L

(L35) 4.3L (LF6)

4L60-E

(M30)

TAD, MSD, CAD, CBD, KAD, WBD, SHD

24221154

1998-2000

S Truck

2.2L

(LN2) 2.2L (L43)

4L60-E

(M30)

SAD

24221153

1998-2000

F Car

3.8L

(L36)

4L60-E

(M30)

FBD, FCD

24221159

1998-2000

F Car

Y Car

5.7L

(LS1)

4L60-E

(M30)

FFD, YDD

24221158

1998-2000

C/K Truck

(Includes Police Pkg.) G Van

5.7L

(L31) 5.0L (L30)

4L60-E

(M30)

LHD, LSD, LUD, LPD, KXD, CPD

24221161

1999-2000

C/K Truck

4.8L

(LR4)

4L60-E

(M30)

CCD, CFD, KBD

24221162

1999-2000

C/K Truck

5.3L

(LM7)

4L60-E

(M30)

CJD, CHD, KCD

24221162

Customer: replied 3 years ago.
so since my fluid is red and no debri in pan all is good and valve body will fix this. is this a recalled product??? how much would this cost me to have fixed or can i replace it myself.. will a shop give me a warranty on this? i use to be a mech. for ten year's but went into construction...
Expert:  GM Tech (Cam) replied 3 years ago.
It should fix it, yes. Not a recall so no warranty. Yes you can replace it, you will just need to be mindful of the check balls.
Customer: replied 3 years ago.
how much does one cost? and if I had a shop do it what would they charge?
Expert:  GM Tech (Cam) replied 3 years ago.
About 300 for the part and about 2hours max to install. I would say 500$ repair .
Customer: replied 3 years ago.
then that would be 500.00 well spent ... most shops gar. the work anyway.. my last question it this goes 100% while driving will it lock up my trans and blow my rear..
Expert:  GM Tech (Cam) replied 3 years ago.
No, if it locks up you will stall out when coming to a stop like forgetting to press the clutch on a standard transmission.
Customer: replied 3 years ago.
cam thank you so much you just saved my a lot of money by your exp. then have a trans shop rob me. now would you let the dealer to it or a well known trans shop
Expert:  GM Tech (Cam) replied 3 years ago.
The dealer will charge you more because they will want to use the gm part worth twice that. The price I found was on rockauto. I would get a transmisson shop to do it and you go armed with this info.
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 27662
Experience: GM Grand Master Technician 2007. 11 years experience.
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