Throttle/Pedal Position Sensor/Switch A Circuit
2003-2003 Mazda B2300 2.3L I4
The 2003 Mazda B2300 is equipped with a 2.3L inline-4 engine. Below you'll find detailed p0120 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
General malfunction in the throttle position sensor (TPS) or accelerator pedal position sensor circuit.
Symptoms
- Check Engine Light
- Erratic idle
- Poor throttle response
- Limp mode
- Stalling
Common Causes
- Faulty TPS
- Wiring damage
- Throttle body issue
- PCM failure
Diagnostic Steps
- Test TPS voltage sweep (smooth transition 0.5-4.5V)
- Inspect wiring
- Check throttle body
- Test reference voltage
Repair Notes
Replace TPS or throttle body assembly. Some vehicles require TPS relearn procedure.
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
P0120 on Other Vehicles
Common Questions
What does code P0120 mean on a 2003-2003 Mazda B2300?
P0120 stands for "Throttle/Pedal Position Sensor/Switch A Circuit". General malfunction in the throttle position sensor (TPS) or accelerator pedal position sensor circuit.
What are the symptoms of P0120 on a Mazda B2300?
Common symptoms of P0120 include: Check Engine Light, Erratic idle, Poor throttle response, Limp mode, Stalling.
What causes P0120 on a 2003-2003 Mazda B2300?
Common causes of P0120 include: Faulty TPS, Wiring damage, Throttle body issue, PCM failure.
Last updated: March 2026