I just got a error code message of P1780, which tells me the problem is the transmission control switch is out of range.
Can anyone tell me what I need to do to fix this issus, and explain what this error code really means?
Thanks..
Jerry
P1780 is returned when the PCM doesn't see the OCS (Overdrive Cancel Switch) activated during the quick test. This could result from a switch or wiring concern or be the result of an improperly performed test. During the self test, you will be requested to activate one or more inputs.... if the PCM doesn't see a "change of state" in the circuit, it will flag a code.
When we are requested to activate an input, we need to be sure to allow enough time for the PCM to see the condition since the processor cannot monitor all of the inputs all of the time..... It, instead, looks at each input briefly in a rapid cycle. Some inputs may get checked several times during this cycle while other inputs may only get scanned once.
HTH
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