P1637

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 – ABSCM (DSCCM) to ECM CAN short circuit fault ABSCM (DSCCM) failure ECM failure
• CAN open circuit fault – ABS/TCCM (DSCCM) to ECM CAN short circuit fault ABS/TCCM (DSCCM) failure ECM failure

Quick checks

• Confirm freeze-frame and conditions when the code set
• Inspect connectors, grounds, and harness for the circuit named in the code
• Generic OBD often cannot read ABS — may need SDD/JLR tool for full module codes
• Check module power/grounds and bus wiring before condemning a module