Evaporative Emission System Purge Control Valve Circuit High
The EVAP purge control valve circuit is reading a voltage or signal higher than the expected range, indicating a malfunction in the emission control system. This code affects the vehicle's ability to properly manage fuel vapors and can impact emissions performance and fuel efficiency.
What You Might Notice
- Check Engine Light illumination
- Slight reduction in fuel efficiency
- Gasoline odor near the vehicle
- Potential rough idle or stumbling
- Service Engine Soon warning light
Most Common Causes
- 1
Faulty purge control valve
The purge control valve may be stuck open, partially stuck, or electrically malfunctioning, causing the circuit voltage to remain high.
- 2
Wiring or connector issues
Damaged, corroded, or loose wiring and connectors in the purge control valve circuit can cause incorrect voltage readings.
- 3
Engine control module (ECM) problem
A faulty ECM or PCM may incorrectly report the purge valve circuit voltage as high despite normal operation.
- 4
EVAP canister or hose blockage
A blocked canister or kinked hose in the EVAP system can cause abnormal pressure and circuit voltage readings.
How to Diagnose It
- 1
Check Faulty purge control valve — The purge control valve may be stuck open, partially stuck, or electrically malfunctioning, causing the circuit voltage to remain high.
- 2
Check Wiring or connector issues — Damaged, corroded, or loose wiring and connectors in the purge control valve circuit can cause incorrect voltage readings.
- 3
Check Engine control module (ECM) problem — A faulty ECM or PCM may incorrectly report the purge valve circuit voltage as high despite normal operation.
- 4
Check EVAP canister or hose blockage — A blocked canister or kinked hose in the EVAP system can cause abnormal pressure and circuit voltage readings.
How to Fix It
- 1
Replace purge control valve
Disconnect the valve connector and hoses, unbolt the old valve, install the new purge control valve, reconnect hoses and electrical connector, then clear the code and test.
- 2
Inspect and repair wiring/connectors
Locate the purge control valve circuit wiring, inspect for corrosion or damage, clean connectors with electrical contact cleaner, repair any damaged wires, and ensure secure connections.
- 3
Check EVAP hoses and canister
Inspect all EVAP system hoses for cracks, kinks, or disconnections; verify the charcoal canister is properly mounted and not blocked; replace or reconnect hoses as needed.
- 4
Test and reprogram ECM if necessary
Use a diagnostic scanner to verify voltage readings at the purge valve; if readings are normal but code persists, the ECM may require reprogramming or replacement by a dealership.
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