P1121moderate severityPowertrain
TP Sensor Circuit Intermittent High Voltage
on 2010 Cadillac Escalade 6.2L V8 · 4WD
What this code means
The PCM detected intermittent high voltage spikes from the Throttle Position Sensor circuit.
Symptoms
- Check Engine Light (intermittent)
- Momentary surge or hesitation
- Erratic idle
- Intermittent Reduced Engine Power
Common causes
- Loose TP sensor connector
- Intermittent wiring fault
- Worn TP sensor
- Carbon buildup on throttle blade
Diagnostic steps
- Wiggle test TP sensor connector while monitoring
- Inspect wiring for chafing
- Test TP sensor through full range
- Check for carbon buildup in throttle body
Repair notes
Clean throttle body. Repair connector or replace TP sensor/throttle body.
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