Throttle/Pedal Position Sensor/Switch D/E 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 p2138 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The dual accelerator pedal position sensors report conflicting values.
Symptoms
- Limp mode
- No throttle response
- Check engine light
- Engine at idle only
Common Causes
- Failed APP sensor
- Corroded pedal connector
- Wiring fault
- 5V reference issue
Diagnostic Steps
- Check APP sensor D and E voltages
- Verify 5V reference
- Inspect pedal connector
Repair Notes
Replace accelerator pedal assembly. Check shared 5V reference circuit.
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
P2138 on Other Vehicles
Common Questions
What does code P2138 mean on a 2004-2004 Buick Century?
P2138 stands for "Throttle/Pedal Position Sensor/Switch D/E Voltage Correlation". The dual accelerator pedal position sensors report conflicting values.
What are the symptoms of P2138 on a Buick Century?
Common symptoms of P2138 include: Limp mode, No throttle response, Check engine light, Engine at idle only.
What causes P2138 on a 2004-2004 Buick Century?
Common causes of P2138 include: Failed APP sensor, Corroded pedal connector, Wiring fault, 5V reference issue.
Last updated: March 2026