TCC Question

If the auto trans. torque converter clutch was not locking, would the "check engine" light illuminate and an error code be set?
Thanks.

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Only if it was an electrical problem like the wires loose or burnt or shorted. Mechanical problem with the TC clutch itself will not usually do it.

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the CE light will come on any time the ECM sees an incorrect ratio for the proper circumstances
so ANY TCC problem that prevented a 1:1 in 3rd with TC locked, or whatever ratio the OD in the vehicle has with TC locked, will set it
GM has the infamous P-1870 which simply means 'transmission component slipping', it can be anything from a bad brake switch to an internal problem in any of 4 areas (forward pack, 3-4 pack, band, or TC {for the 4L60E})

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Why would a brake switch flag a slipping trans code?
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because power for the TCC on-off solenoid (pre-01) goes thru the NC contacts on the switch (GM trucks)
if the witch is bad (open at rest) the TCC cannot come on
it usually flags an additional code of the P-188X variety which signals an electrical problem in the TC solenoid circuit....BUT it will ALWAYS flag an 1870 because the ECM is looking for 1:1 in 3rd with TC commanded on

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Ok, now it make sense, thanks Gary
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