Shovels4ever
Member
It appears the ECM is comparing the data from the sensor: tssm and speedometer.
If the ECM is not provided the proper signal, It can not interpret the signal and consequently throws a code to inform you there is a problem in either the tssm or speedo.
So, check all positive and grounds on both.
If the ECM is not provided the proper signal, It can not interpret the signal and consequently throws a code to inform you there is a problem in either the tssm or speedo.
So, check all positive and grounds on both.