4L60E has 1870 code

Your driving along and suddenly the check engine light is shining brightly. The transmission still shifts but the shifts are harsh. Upon a check of the codes, you find an 1870 TCC slip, converter overheat. This does not mean a transmission rebuild. There are many reasons for an 1870 code the most common being worn valves in the valvebody. In order to achieve PWM (pulse width Modulation) the valve in the valvebody is stroked many times. Actually thousands of times a minute. This causes severe wear in the valvebody and loss of pressure. If this has not been occuring too long, the repair can be as simple as a Transgo shift kit to repair and get pressures back to normal. While you are in there the next step should be to replace the solenoids since they can also cause low pressure problems as they work just as hard as the valves. These repairs can be done with the transmission still in the vehicle and the repair is alot cheaper then a full rebuild!!