P1121moderate severityPowertrain
TP Sensor Circuit Intermittent High Voltage
on 2005 Chevrolet Impala 3.4L V6 · FWD
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.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
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