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Old 10-19-2010, 09:49 PM
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97 chevy silverado k1500

i have a 97 chevy last week i was driving it stoped at a stop sign and when i pulled out it had a hard shift from first to second and the engine light came on. i took it to advance auto and had it checked and they said p1870 manufacture transmisson control. they told me to change my fluid and filter i did and put a bottle of lucas in it so far so good knock on wood. has any one on here run into this problem?

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Old 10-20-2010, 04:45 AM
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Quote:
Originally Posted by chris97chevy350
i have a 97 chevy last week i was driving it stoped at a stop sign and when i pulled out it had a hard shift from first to second and the engine light came on. i took it to advance auto and had it checked and they said p1870 manufacture transmisson control. they told me to change my fluid and filter i did and put a bottle of lucas in it so far so good knock on wood. has any one on here run into this problem?
i see it all the time. the actual definition is transmission component slipping.
usually it has to do with torque converter clutch slip.
if the computer sees more than 175 rpm slip from the torque converter clutch for 7 seconds or more 3 times in the same key cycle, it will throw that code.
usually, the problem is is the valve body, but not always.
if the trans has more than 150k, its lived its serviceable life and needs to be gone through with a full rebuild.
drive it till it throws the code again, then id start looking to see about getting the trans rebuilt.
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Old 10-20-2010, 03:05 PM
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Quote:
Originally Posted by tnsmith10
i see it all the time. the actual definition is transmission component slipping.
usually it has to do with torque converter clutch slip.
if the computer sees more than 175 rpm slip from the torque converter clutch for 7 seconds or more 3 times in the same key cycle, it will throw that code.
usually, the problem is is the valve body, but not always.
if the trans has more than 150k, its lived its serviceable life and needs to be gone through with a full rebuild.
drive it till it throws the code again, then id start looking to see about getting the trans rebuilt.
what would be the cheapest way to fix it?
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Old 10-25-2010, 04:48 PM
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Originally Posted by chris97chevy350
what would be the cheapest way to fix it?
so far it hasn't came on but i had a guy at work to go on all-data and it showed p1870 tcc slippage. could that be something other than the valve body could it be a tcc solinoid or a shift solinoid or torque converter and it had a harsh shift from 1st 2 second but that has not done it no more since i serviced the trans. :confused
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Old 10-25-2010, 05:34 PM
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Quote:
Originally Posted by chris97chevy350
so far it hasn't came on but i had a guy at work to go on all-data and it showed p1870 tcc slippage. could that be something other than the valve body could it be a tcc solinoid or a shift solinoid or torque converter and it had a harsh shift from 1st 2 second but that has not done it no more since i serviced the trans. :confused
the shift solenoids are to make the trans shift. they dont have anything to do with lockup.
the mere fact that after the trans was serviced and its not throwing a code doesnt mean a whole lot,new fluid has fresh detergents, and the viscosity is thicker compared to old used fluid. its going to throw the code again, its just a matter of time.
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Old 10-25-2010, 05:49 PM
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That code is normally associated with TCC/TorqueConverterClutch slippage. TCC Solenoid could be bad but, TCC is probably shot or TCC Regulator Valve could be leaking also. >> http://www.sonnax.com/announcements/77754-03K.pdf also TCC Apply Valve in Pump could be leaking >> http://www.sonnax.com/announcements/77805-K.pdf this is for Non-PWM TCC, 77805E-K is for PWM/PulseWidthModulated TCClutch.
"tnsmith10" is correct with that many miles it's probably ready for a complete rebuild. just plain worn out.
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Old 10-25-2010, 10:55 PM
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Quote:
Originally Posted by tnsmith10
the shift solenoids are to make the trans shift. they dont have anything to do with lockup.
the mere fact that after the trans was serviced and its not throwing a code doesnt mean a whole lot,new fluid has fresh detergents, and the viscosity is thicker compared to old used fluid. its going to throw the code again, its just a matter of time.
i no that i was just saying it hasnt come on yet i was just trying to find out what would be the problem and try to fix it i would like to try the best way to start on this project.
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Old 10-26-2010, 08:16 PM
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generally the p1870 code isa result of worn out valve body bore in the PWM system. A TransGo kit in orange box of the 4L60E JR shift kit will fix this code problem.

The code can also be related to worn out bushings and input shaft leakage - cross leaks in the stator support area. Common on higher mileage vehicles
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Old 10-27-2010, 10:41 PM
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Quote:
Originally Posted by Crosley
generally the p1870 code isa result of worn out valve body bore in the PWM system. A TransGo kit in orange box of the 4L60E JR shift kit will fix this code problem.

The code can also be related to worn out bushings and input shaft leakage - cross leaks in the stator support area. Common on higher mileage vehicles
do u no were i can ge that trans go kit? and i heard some people tell me that i will have to bore out my valve body and they said it might need a torque converter to. i just dont want to put alot of money in it and still not be fixed.
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Old 10-28-2010, 09:25 AM
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Quote:
Originally Posted by chris97chevy350
do u no were i can ge that trans go kit? and i heard some people tell me that i will have to bore out my valve body and they said it might need a torque converter to. i just dont want to put alot of money in it and still not be fixed.
If you really wanted to narrow it down more, one could watch the TCC operation on scan tool data to see if slip happens at hot or cold operating temperatures. Also, one can hook into the cooler lines, a flow meter or graphing flow meter and monitor this fluid flow as TCC is commanded, to help isolate if its a hydraulic signal problem or leak after signal oil. This is a little involved and mainly only done by professionals. Others will like a silver bullet repair w/o labor intensive diagnosis. But usually pre-'02 vehicles common pattern failure seems to be mainly valvebody issues. As already stated GL
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