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Home >> Jeep >> 2025 >> Grand Cherokee Altitude, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 78 (2.0L - DTCS P0108 To P0125) >> DTC Troubleshooting >> P0121 Throttle Position Sensor 1 Performance >> Possible Causes

Possible Causes

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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  .