Engine codes start at 11 Could it be 55 which means N/A
Trouble code P0149 means:Fuel Timing error
The error code p1193 on a 2001 Dodge Grand Caravan indicates that the intake air temperature sensor has failed. The sensor can be replaced by unbolting it, removing the wiring harness, and pulling it from the intake.
Charging system , voltage too low
automatiic transmission control system malfunction
Trouble code P0755 means:Shift solenoid B malfunction
Cylinder #2 misfire. see link below
With a code reader that plugs in under the drivers side dash.
21 is for the oxygen sensor reading staying at center.
Egr position sensor rationality. Likely a failed egr valve.
Cylinder number two misfire.
Trouble code P1684 means: The battery has been disconnected within the last 50 starts
Trouble code P0601 means: Internal Control Module Memory Check Sum Error