What does it mean?
This code is the high voltage counterpart on the refueling vapor control valve circuit. The control module switches the valve and monitors its own output; when the voltage stays at supply level while the driver is commanding current flow, or voltage is present with the output off, the module records a high circuit fault. Two conditions produce that reading: an open somewhere in the loop, so no current can flow at all, and an unintended connection to battery voltage that holds the line up. Because the module cannot separate the two electrically, both fall under this single code. Refuelling functions that depend on the valve are suspended, which on sealed tank systems can prevent the fuel filler from being released.
Symptoms
- MIL (check engine lamp) on with evaporative system codes
- Fuel filler will not release or refuelling is not permitted on vehicles with a controlled filler
- Repeated nozzle shut off when filling the tank
- No actuation sound from the valve during a scan tool output test
- Fuel vapour odour at the rear of the vehicle after filling
- Evaporative readiness monitor stays incomplete
Likely causes
- Open circuit in the control or supply wire, including a corroded splice in the rear harness
- Terminal backed out of the valve connector or a connector left unlatched after service
- Open solenoid winding inside the valve
- Control wire chafed against a battery voltage feed running in the same loom
- High resistance from severe terminal corrosion, which the module interprets as an open
- Blown fuse or open relay contact on the feed to the evaporative components
- Module driver failure, only after the external circuit has been proven good
How to fix it
- Confirm the code is current, then run an output test and listen for the valve at the tank or canister
- Measure the solenoid resistance at the valve; infinite resistance identifies an internally open valve
- With the ignition on and the valve unplugged, look for unexpected battery voltage on the control wire, which indicates a short to power
- Test continuity of the control wire from the module connector to the valve connector and check the supply side fuse
- Inspect both connectors for corrosion, pushed out terminals, broken locks and moisture ingress
- Repair the open or the short to power, seal the repair against water and re secure the harness
- Clear the code, verify actuation and complete a refuelling cycle to confirm normal operation