Alternative Fuel Return Line Valve Control Circuit Low

Where it lives

For P2AA0, the circuit described runs through the valve. The description of P2AA0 reports a fault at the valve.

Check these first

• A short to ground on the alternative fuel return line valve control wire
• A chafed return line valve harness rubbed through on the frame or bracket
• A failed return line valve solenoid with low internal resistance
• A module driver pulled low by a return line valve fault

What to do next

1. Scan all modules and record the return line valve command and feedback
2. Inspect the return line valve harness for chafing or a pinched section
3. Test the return line valve control wire for a short to ground with the valve unplugged
4. Measure the return line valve coil resistance and look for a low reading
5. Replace the return line valve if the harness and resistance test clean
6. Clear the code and retest

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