Question about 2000 Chevrolet Blazer

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If my truck needs code p1870 for tranny do i need

I have 2000 chevy blazer the transmission ****, i was told that i need new transmission by one shop, another told me I need to replace code P1870, WHAT IS TRUE HELP'

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  • yadayada
    yadayada May 25, 2010

    what is ****?

  • comharr39 May 25, 2010

    THE TRUCK JERKS WHEN IT GETS WARM . I was told I need to replace the part with the code P1870 NOW ANOTHER SHOP SAID i NEED ANOTHER TRANSMISSION

  • yadayada
    yadayada May 25, 2010

    i have no idea why they say it needs a tranmission.

  • comharr39 May 25, 2010

    so what do i need

  • yadayada
    yadayada May 25, 2010

    That will require a full diagnsotic, that is why i make $30.00 per, it is not that easy and there is no magic fix

  • comharr39 May 26, 2010

    thank you for nothing no help to do not have to be so smart, i know that is why you make 30.00 an hour.

  • yadayada
    yadayada May 26, 2010

    not being smart meant zero disrespect to u, just stating facts, allot of people think this job is so easy, just hook up a computer thinge and it tells u what is wrong, have heard this over and over in years past, wish that was the case, I am honest about what it takes. Have a nice day and good luck with the repair.



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You may need a new one.... depends on damage possiblities. OR, if only acts up when HOT, it could just require the Sonnax TCC regulator valve kit installed in the valve body. It is just a couple hours of work. I've done oodles of these for $200

Posted on Aug 05, 2010

  • mcclain187 Jan 25, 2012

    dtrannyman r you in michigan by chance because I need this one to my 99 blazer....if so pls. email me at

  • dtrannyman Jan 28, 2012

    any good trans shop will know of Sonnax and this fix. Call around and you'll find one, guaranteed. Some places will install a remanufactured valve body instead.
    Sorry, I am in WI



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2 Answers

2000 chevy blazer trouble code p1870 need to know how to fix it

this code does not appear in the GM code list please contact the code reader manufacturer

Feb 17, 2014 | Cars & Trucks

1 Answer

I own a 1998 Chevy Blazer 4wd that is on its 3rd transmission and I'm having the same issue where when shifting from 2nd to 3rd gear it's slipping badly my rpm's rev up to 3500 and I have to take my foot...

this is a known issue with the gm 4L60E transmission. the valve body in transmission causes this. if it is wore, then less fluid is sent to shift selonoids. thus causing torque convertor not to lock up, and this causes slipping. if it slips 2 consecutive trips then the transmission detects this and should turn on check engine light. ( p1870 ). you can see if the tcc solinoid is bad. but if not its usually the valve body in tranny.

Dec 15, 2010 | 1998 Chevrolet Blazer

1 Answer

Code p1870 for 1999 chevy blazer

It is a code for harsh shift from 1st to 2nd gear in the transmission. May be a recall on your vehicle. Check with your local Chevy dealership. Need to replace valve body.

Please Vote!!! Thanks!!!

Aug 31, 2010 | 2000 Chevrolet Blazer

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I have a p1870 code on my 1996 odlsmobile cutlass supreme and don't know what is the problem.

ok p1870 is a general code for most gm vehicle indicating a problem with the manufacturer controlled transmision and the only people that have the computer to connect to the tranny computer is a dealer or tranny shop i have the same code in my 96 pontiac for detecting a slippage in the overdrive gear.

Jul 30, 2010 | 1997 Oldsmobile Cutlass Supreme

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

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).
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.

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

Pulling a code p1870

go 2 auto zone and they can solve the code then u can buy the parts there and fix it but dealers are **** to a shop not a dealer

Jul 30, 2008 | 1998 Pontiac Sunfire

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