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2003 TOYOTA TACOMA
2.7L I4•RWD•AUTOMATIC•gas•3RZ-FE
5 active safety recalls on this vehicle — view recalls
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Repairs0Labor1047Torque1633Fluid17DTC3480Battery2Maintenance0Recalls5
P0479moderate severityPowertrain

Exhaust Pressure Control Valve Circuit Intermittent

on 2003 Toyota Tacoma 2.7L I4 · RWD

What this code means

The exhaust pressure control valve circuit is intermittent for the second sensor/valve. The PCM sees erratic signals affecting backpressure control.

Symptoms

  • Check engine light on
  • Erratic engine performance
  • Reduced power under load

Common causes

  • Intermittent wiring fault
  • Corroded connector
  • Faulty exhaust pressure control valve
  • Bad PCM

Diagnostic steps

  1. Retrieve code and freeze frame
  2. Inspect and wiggle-test wiring
  3. Check valve signal with scan tool
  4. Repair connection or replace valve
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