Exhaust Pressure Control Valve Intermittent
P0479 — Exhaust Pressure Control Valve Intermittent
System: Powertrain | Type: Generic (OBD-II Standard) | Make: Generic
P0479 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.
Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.
Because P0479 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.
The Powertrain Control Module (PCM) sets this code when it detects an intermittent or erratic signal from the exhaust pressure control valve circuit. This may be due to unstable electrical connections, wiring issues, or mechanical problems causing inconsistent valve operation.
Detailed possible causes for P0479 are available to TaT members.
Unlock with Free TrialStep-by-step diagnostic guidance for P0479 is available to TaT members. Our Diagnostic Assistant provides professional-level troubleshooting procedures written by experienced technicians.
Unlock with Free Trial| Code | P0479 |
| System | Powertrain |
| Type | Generic (OBD-II Standard) |
| Make | Generic |
| Causes | Available |
| Diag. Assistant | Available |
| Video | — |
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