Question about 1997 Buick Century

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DIRTY TRANSMISSION OIL .

HI, MY CAR RUNS PERFECT, TRANSMISSION SMOOTH, BUT CHECK ENGINE IS ON, IT SAYS: P1870 CODE. {TRANSMISSION SLIPPING COMPONENT}, I NOTICED THAT TRANS OIL IS A LITTLE LIGHT BROWN NOT RED, CAN A DIRTY OR BURNED TRANS OIL CAN CAUSE THE CHECK ENGINE ON? GIVING THIS CODE P1870? THANKS. 126000 MILES. V6 3.1L BUICK CENTURY 97.

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Yes- the computer is picking up a problem in the transmission [which has about 20+ codes of its own]trans fluid is a reddish burgundy color like power steering fluid when brown means burnt something slipping-or overheating- or clogged filter -change fluid and filter can b an easy fix if caught in time

Posted on May 05, 2010

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No but a low fluid level could cause a slip telling the ecm there is a slip top it off then clear the code and drive a few miles if this code comes back i would say there is internal damage to the tranny

Posted on May 05, 2010

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How to fix 1999 Chevy Cavalier with a P 1870 code


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1997 buick lesabre code po1870


P1870 ! not P01870
DTC P1870 Transmission Component Slipping (Buick Built Before 6/17/97)
DTC P1870 Transmission Component Slipping (All Other Applications)
Circuit Description
The Powertrain Control Module (PCM) monitors the Torque Converter Clutch (TCC) slip by calculating the difference between the engine speed and the transmission output shaft speed.
If the PCM detects an excessive amount of slip when the TCC is engaged, then DTC P1870 sets. DTC P1870 is a type B DTC.

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P1870 code for 1997 buick lesabre


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Aug 29, 2011 | 1997 Buick LeSabre

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I have a 2000 Firebird Formula LS1 engine, automatic transmission. The error code I get is P1850 or P1870


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Mar 23, 2011 | Chevrolet Camaro Cars & Trucks

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My 99 jimmy service engine light came on. The computer says component in transmission slipping. It shifts hard from 1st to2nd after the tranny warms up. What causes this


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Check engine light on code p1870 what to do light is on steady


I also have a 99 Lumina and code p1870 means: Transmission Component Slipping/ Transmission Mechanical Transfer Case 4x4 Switch Circuit Failure Now we both know theres no 4x4 in these cars. So I'm going to try to find out about this and try to figure out why the PCM showed this code. When I do, I'll put it on my profile.

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Code P1870 What is P1870


The code description for P1870 is "transmission component slipping" and usually means that the computer has detected a difference between what the input speed is and output shaft speed should be under certain conditions and tagged it as a slipping component. Usually it means that a clutch pack [usually direct drive clutch] or band isn't holding under a load and has started to slip. Sometimes the slippage can be observed on a scan tool during a road test but if the slippage is bad enough it may be noticable just driving it. Low transmission fluid level could cause this problem so make sure you check it before going any further. If it turns out that there is interal slippage then the transmission would have to come out and be repaired.

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3 Answers

P1870 code what does it mean


This GM service bulliten might apply to your vehicle:

TSB # 01-07-30-023A
Harsh 1-2 Upshift, SES, MIL, or CEL Illuminated, DTC P1870 Set (Replace Valve Body)
1996 Buick Roadmaster
1996 Cadillac Fleetwood
1996-2000 S10 Blazer
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, 1999 (Julian Date 9015)
This bulletin is being revised to update the Parts Information

Please discard Corporate Bulletin Number 01-07-30-023 (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. These valves are used in all transmissions produced after January 15, 1999 (Julian Date 9015), 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

Jun 18, 2010 | 1998 GMC Jimmy

1 Answer

My car runs perfect but it has code p1870. oil trans looks a little light brown, i dont have any problem with the trans, it works very smooth. why check engine light it says code p1870????? can a dirty oil...


yes, when you burn your transmission fluid, its just like when you burn your motor oil. Lower vescosity means more friction. more friction, more heat, more heat messes with your sensors inside the trans causing them to send a code to the ecm. do a filter change and transmission flush. clear the code and retest.

May 05, 2010 | 1997 Buick LeSabre

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