P-1870

"Doc" wrote:
"Get the PCM scanned and check for DTC P1870."
I went to a tranny shop to get info about this and he said not to worry until the "Check Eng." light comes on. Is this correct, or does
one have to scan for the set code manually? 98 Blazer.
Thanks,
brody
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Just get the damn thing scanned. It's free. P1870 can be stored sometimes without the SES light having been illuminated.
Doc
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Don't know about anything that's free around here, (Bay Area) but thanks for the info.
brody
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Ahhh, you shoulda mentioned that you lived in Cali. They (parts stores) won't scan for free, won't scan at all as a matter of fact. Only state in the country that doesn't allow that for some strange reason.
Doc

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Nothing strange about it. In California, in order to perform retail emissions repairs, the facility performing those repairs has to be CARB certified. Ain't no way the counter drones at AutoZoo are going to qualify. This all tracks back to when AutoZoo -did- perform free code retrieval, seems they were clearing the codes and failure history making a legitimate repair by a qualified shop that much harder. The state put the keebosh on that.
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wrote:

Ahhhh, that makes sense, thanks for the 411 Neil!
Doc
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My pleasure.
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Code p-1870 is common on these.The most likely cause on this if vehicle has a few miles on it is the T.C.C. regulator apply valve has worn into the bore of the valve body.You will probably have to go to a good transmission shop and have them pull the valve body off.They will have to be sure to use a TRANSGO recalibration kit to repair it.The kit comes with a new style valve designed to fix this specific problem.It should take about 2-3 hrs. to fix. Good luck.
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