Why do I still have code P0700 in my 05 Dodge Caravan?

Question

We have a 2005 Dodge Caravan. One day the a/c blower stopped working,the transmission wouldn't shift from 2nd gear, and when I turned the key off, it took it several seconds to die. We replaced the old battery with a new one and it dies normally now but still has the other issues. A mechanic friend of my husband hooked it up to a diagnostic computer and it gave codes 0700, 0645, and 0406. We were told we needed to change the transmission control solenoid so we put a new one on it. We also were told the 0645 was the a/c problem and the 0406 was a bad EGR sensor. After replacing the transmission control solenoid, it still giving the 0700 code and it still will not shift from 2nd gear. The mechanic friend told my husband to check the transmission relay but he cannot find it anywhere. Anyone else know why it would still be giving that code and can someone tell me where the relay is? Thank you!

Answer 1

P0700 Transmission fault detected, Mil light requested on.

P0645 A/C clutch relay circuit

P0406 EGR position sensor high

Code P0406 sensor high, this means a disconnection of the EGR valve, Checking the harness for any disconnection at the harness and proper terminal mating, this mean a open circuit to the EGR valve. P0645 the A/C clutch this can also be from a disconnection where the A/C relay does not recive power.All these code can be related , check the fuses in the engine fuse box, on the cover of the fuse box use that as a map of the relay and the designated fuses.If the ignition switch is not properly working this can also be the result of these code especiall with the transmission not albe to shift properly.Check fuse 15 this gives power to the transmission relay,fuse 16 control the A/C relay,