P1120high severityPowertrain
Throttle Position Sensor 1 Circuit
on 2004 Cadillac STS 4.6L V8 · RWD
What this code means
The PCM detected a malfunction in the Throttle Position Sensor 1 circuit. This code is set when the TP sensor signal is erratic or out of expected range during operation.
Symptoms
- Check Engine Light
- Erratic or no throttle response
- Reduced Engine Power mode
- Stalling
- Rough idle
Common causes
- Faulty throttle position sensor
- Corroded TP sensor connector
- Damaged wiring to TP sensor
- Throttle body failure
- PCM failure (rare)
Diagnostic steps
- Test TP sensor voltage at idle and WOT
- Inspect TP sensor connector for corrosion
- Check wiring continuity
- Monitor TP sensor with scan tool through range
- Test 5-volt reference supply
Repair notes
Replace throttle position sensor or throttle body assembly. Clean connectors.
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P0002
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P0004
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P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
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P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1