I have 1993 gmc truck. The other day it didn't want to start. it When it started when ever u acclelerate it wants to hesitate. Here are the codes that i pulled off of it. dtc 15 coolant temperture low, dtc 72 output speed loss, and dtc 81 quad driver module and shift b fault. any one got any ideas ?

 

Change the coolant temperature sensor near the thermostat housing.

 

Just check out the temperature, or there would be some normal problem in your coolant.

 

Yes! Check if there something wrong with the coolant. Other than that there must be something wrong with the temperature

 

I think you should check your truck coolant.