TP Sensor Circuit Intermittent High Voltage
2007-2007 Cadillac CTS 3.2L V6
The 2007 Cadillac CTS is equipped with a 3.2L V6 engine. Below you'll find detailed p1121 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
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.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P1121 on Other Vehicles
Common Questions
What does code P1121 mean on a 2007-2007 Cadillac CTS?
P1121 stands for "TP Sensor Circuit Intermittent High Voltage". The PCM detected intermittent high voltage spikes from the Throttle Position Sensor circuit.
What are the symptoms of P1121 on a Cadillac CTS?
Common symptoms of P1121 include: Check Engine Light (intermittent), Momentary surge or hesitation, Erratic idle, Intermittent Reduced Engine Power.
What causes P1121 on a 2007-2007 Cadillac CTS?
Common causes of P1121 include: Loose TP sensor connector, Intermittent wiring fault, Worn TP sensor, Carbon buildup on throttle blade.
Last updated: March 2026