2003 Dodge Caravan P1698 Code: No Bus Message from Transmission Control Module
I own a 2003 Dodge Caravan with a 3.3L engine. Recently, the transmission warning light came on and the vehicle is now refusing to shift properly. The onboard diagnostic system has displayed several codes: 11 - Electronic Control Unit Internal Malfunction, 13 - Under Voltage, and P1698 - No Bus Message from Transmission Control Module. Additionally, the speedometer has stopped working, and all gear indicator lights are illuminated. The vehicle is exhibiting symptoms consistent with a communication failure between the transmission control module and the powertrain control module. The P1698 code specifically indicates that the transmission control module is not receiving a proper bus signal from the main control unit. I'm seeking advice on how to diagnose and resolve this issue, especially given the combination of electronic faults and loss of instrument panel functionality.
Are you seeing both two-digit and P-series codes in your scanner? Does the odometer display 'NO BUS'? Please only list the current diagnostic trouble codes (DTCs) that are actively showing on your OBD2 scanner. According to my reference material, P1698 is often linked to a remote starter system or wiring issues. Have you checked the transmission relay and associated fuses? A faulty relay or blown fuse could be causing the communication failure between modules.