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diagman
diagman, ASE Certified Technician
Category: Chevy
Satisfied Customers: 679
Experience:  17 YEAR MASTERTECH
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HOW DO YOU FIX A CODE DTC P1860 AND P1886

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HOW DO YOU FIX A CODE DTC P1860 AND P1886
Test voltage at the TRANS fuse, #20. If the voltage is lower than the expected 13-14v, replace the ignition switch. If the voltage is OK at the fuse, test at the transmission, pin E, Pink wire, circuit #1020. Disconnect the red Powertrain Control Module (PCM) connector. Key on Check amp draw of the Torque Converter Clutch (TCC) Pulse Width Modulation (PWM) solenoid, pin 7 Brown wire to ground. Should have near 1 amp of current draw. Replace the TCC PWM solenoid, test the new solenoid with an ohmmeter prior to install. Should have 10-15 ohms at room temperature
Customer: replied 8 years ago.

 

what would ignition switch have to do with tranny not shifting properly.

when you are driving in beginning its fine shifts normally as it heats up

truck feels like it is straining to go but if u shift it to low and then back into regular drive once you are doing about 25-30 it runs at that speed fine until u have to stop again

the ignition switch gives the proper voltage to the fuse block if you do not have proper voltage then you will have problems
Customer: replied 8 years ago.

THANK YOU

 

so you think that its electrical from what i am describing and not the transmission itself

as i said power test came up fine is there anyway to see if pcm is working properly

 

i don't know if this matters but just replaced the engine no codes come up on the engine

and no check light

 

check and make sure that all the ground wires are connected common problem to miss a ground wire by the transmission and not allow the pcm to work properly
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