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Gm p code 1870 - 1996 Oldsmobile Cutlass Supreme Coupe

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P 1870 is just a code that is telling you that the PCM has detected a component slipping inside the tranny.

Posted on May 16, 2014

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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

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I have a 2000 s-10 2.2L auto runs good but have 1870 code and it vibrates on the interstate


there should be a letter before the 1870 code. the vibration could be from tires out of balance. take to tire store

Dec 12, 2010 | 2000 Chevrolet S-10

1 Answer

I have 1997 k-1500 chevy truck that is running rough and producing codes of p 172 , 175 anda gm code of 1870


P0172 AND P0175 are oxygen sensor codes The one you need to adress is isP 01870 that is a transmission code that is saying something is slipping in the transmission Its most likely because its a final code the TCC solinoid PWM or the TCC solinoid valve torque converter controls this to complex to repair with out a whole lot of diagnostic equpitiment you realy need to take this to a transmission shop probably cost you 3 mabey 4 hundred dollars but you will save the transmission and they cost a lot more

Nov 21, 2010 | 1997 Chevrolet K1500

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2000 chevy s-10 2.2L automatic with a P1870 code? I know its a transmission code but which one is it in the transmission?


P-1870 means "Transmission component slipping". A very common problem with these transmissions which sets a P-1870 is 2 valves in the valve body, the TCC regulator and isolator valves. The reason for the problem is these valves wear out their respective bores, the converter clutch apply oil passes by the worn valves lowering the apply pressure of the converter clutch.

The clutch then starts slipping and chattering, sets a P-1870 and maxes out the line pressure causing harsh shifts. The way I usually fix these is with a kit from Sonnax. The valve body is removed, both tcc regulator and isolator valves are removed, their bores reamed, sleeves installed with new valves. This is what needs to be done and will cure 95% of P-1870 issues.


Thank you for using fixya and for a short term fix would be to add a additive, such as Lucas transmission additives.

Jul 19, 2010 | 2000 Chevrolet S-10

1 Answer

Code p 1870 comes up at emissions need help getting it off. Truck runs fine


Diagnostic trouble code P1870 (Transmission Component Slippage) is a General Motors-specific code whose set parameters are determined by transmission type and engine size. The PCM monitors and compares engine speed to vehicle speed after the converter clutch has been commanded ON in either high gear or Overdrive. Should the expected rpm ratio exceed predetermined parameters, DTC 1870 sets. And upon doing so, the PCM elevates the transmission main line pressure and stops converter clutch apply.

Jun 16, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

1997 chevy silverado 5.7 with a code 1870 what it mean


1870 is a transmission error code which indicates excessive wear in the valve body and is usually accompanied by unusual shifting. This is a problem requiring a shop fix unless you are familiar enough with transmissions to attempt the repair yourself. You can go to transmissioncenter.net and you will find the part which will fix this error code from recurring. Unfortunately, you may have to have the transmission rebuilt. I am not affiliated w/PATC, but they are the best source for parts, builds and advice there is for GM 4L60E transmissions.

Feb 13, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Reset code trailer towing may set code gm 4l60E


Diagnostic trouble code P1870 (Transmission Component Slippage) is a General Motors-specific code whose set parameters are determined by transmission type and engine size. The PCM monitors and compares engine speed to vehicle speed after the converter clutch has been commanded ON in either high gear or Overdrive. Should the expected rpm ratio exceed predetermined parameters, DTC 1870 sets. And upon doing so, the PCM elevates the transmission main line pressure and stops converter clutch apply.

Once the vehicle has made it to a cruise state, the PCM then begins to monitor the vehicle's cruise ratio. If at some point the transmission begins to slip, P1870 sets and line pressure is elevated in an attempt to stop any further slippage and prevent further damage. This would explain why DTC 1870 Ls often accompanied by a complaint of a hard 1-2 up shift.

When this code sets, it could have any number of causes, ranging from the sump running low of fluid to a malfunctioning torque converter. Take a GM 4L60-E transmission, for example. When it's in Overdrive, the forward clutch and the 3-4 clutches are applied, as well as the 2-4 band. Now add the converter clutch. This is what the PCM monitors at cruise. If the ratio breaks away, the cause could be any of three components, the hydraulics that operate them or the electronics that control them. Fortunately, experience has shown that in most cases, the cause can be traced to some form of converter clutch failure as a result of valve body concerns. With GMs 4L80-E transmission, this code has usually been the result of a cracked converter clutch piston.

Put a line pressure gauge ($55 shipped on Ebay, or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.049" - 0.500" boost valve (easy fix in pan), and replace the servo with an upgrade servo from a Corvette 4L60E. This will give you a more firm shift and address the DTC 1870 which is common to a weaken Boost valve or faulty EPC valve.

Jan 07, 2010 | 1999 Chevrolet Astro

1 Answer

1996 monte carlo fault codes po300, 441, 705,


THESE ARE FROM THE GM CODE DIFINITION MANUAL, U NEED TO TAKE THIS TO THE DELAER, U HAVE SOME SERIOUS PROBLEMS TO GIVE THIS MANY CODES.

P0300 - Engine Random Misfire Detected
P0441 - Evaporative Emission Control System Incorrect Purge Flow
P0705 - Trans Range Switch Circuit
P1106 - Manifold Absolute Pressure (MAP) Sensor Circuit Intermittent High Voltage
P1133 - Heated Oxygen Sensor (HO2S) Insufficient Switching Bank 1 Sensor 1
P1441 - Evaporative Emission (EVAP) System Flow During Non-Purge
P1662 - Cruise Lamp Control Circuit
P1672 - Low Engine Oil Level Lamp Control Circuit
P1870 - Transmission Component Slipping

Mar 24, 2009 | 1996 Chevrolet Monte Carlo

2 Answers

1996 chevy 1870 o bd code transmisson fine


I had the same problem with a 1996 Camaro. GM service bulletin #01-07-30-023A. You will have to replace the valve body. Will cost around $600.00 to fix. The condition is due to wear in the bore that contains the TCC isolator valve, causes poor are no torque converter lockup

Dec 01, 2008 | 1996 Chevrolet Camaro

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