P0791

Documented for: 2.0L gasoline; 2.5L/3.0L gasoline · System(s): TRANS EOBD, TRANS (ECM*) JAG · Factory MIL flag: 2 · Default action: None (Poor shift quality)

Common causes

• Transmission to TCM intermediate speed sensor circuit: open circuit, short circuit, high resistance Transmission internal intermediate speed sensor circuit: open circuit, short circuit, high resistance Transmission to TCM intermediate speed sensor circuit: shielding defective Sensor ground circuit fault Intermediate speed sensor failure
• Output speed sensor power supply circuit: open circuit
• short circuit Transmission to ECM output speed sensor circuits: open circuit
• short circuit
• high resistance Output speed sensor failure

Quick checks

• Confirm freeze-frame and conditions when the code set
• Inspect connectors, grounds, and harness for the circuit named in the code
• Compare live sensor values vs expected (unplugged/biased sensors are common)