P1643

Documented for: 2.0L gasoline; 2.5L/3.0L gasoline · System(s): EMS EOBD, EMS OBD II · Factory MIL flag: 2 · Default action: ECM Default: –Speed control inhibited –Maximum engine speed reduced

Common causes

• CAN open circuit fault – TCM to ECM CAN short circuit fault TCM failure ECM failure
• CAN Data Bus ECM / TCM Network Malfunction
• CAN Link ECM/TCM Circuit/Network

Quick checks

• Confirm freeze-frame and conditions when the code set
• Inspect connectors, grounds, and harness for the circuit named in the code
• Check module power/grounds and bus wiring before condemning a module

Typical fixes

• Check TCM/ECM CAN connections