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The check engine light is on on my car i put in the computer a said the code p1870 but i don't know whats that mean

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P1870 is a code for a transmission component slipping. It would be very difficult to diagnose yourself. I suggest bringing it to a transmission shop.

Posted on Apr 17, 2009

  • Christopher Foulkes Apr 17, 2009

    I failed to suggest checking the fluid level and color in my previous post. Be sure the transmission fluid level is full and looks red. Check the level when the car is warm, in park with the engine idling and on flat ground.
    The fluid should be red. If it is black and smells burnt chances are something internal to the transmission is at fault and it may require a rebuild.

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1997 Buick Lesabre Custom 3200. Error codes P1870 & P0740. No prior indication. Drive one block, sounds like axel connections in transmission are binding and rarely slipping.


Code P1870...What does it mean??? - GM Forum - Buick, Cadillac ...

www.gmforum.com > ... > 1992-199
Jun 9, 2005 - Location: Bloomington-Normal, IL 1997 SE ... Default Code P1870...What does it mean??? I got a CE light the other day, and this is the code that was read word for word: P1870 ... No TCC solenoid electrical DTC P0740 ... Code P1870 & Speedometer error, Hi_tork, 1992-1999, 4, 10-16-2011 04:08 PM.

Sep 14, 2015 | Buick Cars & Trucks

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1999 chevy s10 four wheel drive 4.3v6pickup wont pass smog fault code p1870 they said transmission is bad can someone explain what it is


DIYer? I recommend a repair manual from your auto parts store. It should provide a complete list of all error codes and likely repair methods. Otherwise find a competent repair shop, or your dealer. I googled your error code This is just one of the answers: http://repairpal.com/check-engine-light-with-code-p1870-057
I am sure you can do a better search since you know far more about the issues.

May 07, 2015 | Cars & Trucks

1 Answer

Why did my check engine light go off on its own? (p1870 code)


The fault is gone. What ever caused the problem is no longer there.
When the computer no longer detect fault it shuts off light. Maybe transmission had a short time problem

May 06, 2015 | 1997 Oldsmobile Cutlass Supreme

1 Answer

CODE P1870,P0420


P1870 generally means that the transmission is slipping. P0420 relates to an issue with a vehicles catalytic converter. To know specifically what each code is, as it relates to your vehicle, you should take it to a local auto-part store (like AutoZone and have them pull the codes off of your vehicle. At auto part stores, they generally do this service for free and it is pretty quick. Regards ~ JD

Nov 28, 2012 | 2000 Pontiac Firebird

1 Answer

Check engine light is on code p01870


I didn't locate that one you posted, but this is the closest thing I ca e up with P1870 Transmission Component Slipping/ Transmission Mechanical Transfer Case 4x4 Switch Circuit Failure I don't know if that pertains to your vehicle since the info needed isn't posted on your question, but if you reply to this post, I will assist you more

Sep 06, 2011 | GMC Suburban Cars & Trucks

1 Answer

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.

Aug 15, 2010 | 1999 Chevrolet Lumina

1 Answer

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.

Jun 21, 2010 | 1999 Chevrolet Silverado 1500

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

2 Answers

DIRTY TRANSMISSION OIL .


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

May 05, 2010 | 1997 Buick Century

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