Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation
2004-2004 Buick Century 3.1L V6
The 2004 Buick Century is equipped with a 3.1L V6 engine. Below you'll find detailed p2135 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The dual throttle position sensors are reporting conflicting values, indicating a fault.
Symptoms
- Limp mode
- Reduced power
- Check engine light
- Erratic throttle response
Common Causes
- Failed TPS (built into throttle body)
- Connector corrosion
- Intermittent wiring
- 5V reference circuit fault
Diagnostic Steps
- Check TPS sensor A and B voltages
- Verify 5V reference
- Wiggle test wiring
- Check connector pins
Repair Notes
Replace throttle body assembly (TPS is integrated). Check 5V reference shared with other sensors.
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
P2135 on Other Vehicles
Common Questions
What does code P2135 mean on a 2004-2004 Buick Century?
P2135 stands for "Throttle/Pedal Position Sensor/Switch A/B Voltage Correlation". The dual throttle position sensors are reporting conflicting values, indicating a fault.
What are the symptoms of P2135 on a Buick Century?
Common symptoms of P2135 include: Limp mode, Reduced power, Check engine light, Erratic throttle response.
What causes P2135 on a 2004-2004 Buick Century?
Common causes of P2135 include: Failed TPS (built into throttle body), Connector corrosion, Intermittent wiring, 5V reference circuit fault.
Last updated: March 2026