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Home >> Jeep >> 2025 >> Grand Cherokee Summit 4xe >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L - DTCS P0108 To P0125 >> DTC Troubleshooting >> P0121 Throttle Position Sensor 1 Performance >> Possible Causes

Possible Causes

Possible Causes
HIGH RESISTANCE IN THE TPS POSITION SIGNAL 1 CIRCUIT
HIGH RESISTANCE IN THE 5-VOLT SUPPLY CIRCUIT
HIGH RESISTANCE IN THE SENSOR RETURN CIRCUIT
THROTTLE BODY
POWERTRAIN CONTROL MODULE (PCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to:  2.0L - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  . 

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