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2 weeks after I bought my GMC 3500 AT4 it wouldn’t start and I disconnected the batteries and reconnected them and it started right up, but the engine light was on and it was show a 100 and 700 code.
the dealership added dielectric grease to the connectors and recharged the batteries on the bench. I went 2 more weeks without issues and then Monday I stopped for gas and the engine light came on with the same codes but was running fine. Tuesday truck wouldn’t start and was showed that fuel was low and ECS has issues, park break was set. I disconnected the ground to the battery on the drivers size and the truck started right up and I reconnected the ground, but the engine light came on with the same codes. Thursday the same thing happened again.
Any suggestions?
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