P2A28

Alternative Fuel Tank Shutoff Valve C Control Circuit Low

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Switching to gasoline when running on alternative fuel
Check Engine Light Illuminates
Problems starting an engine on alternative fuel
Reduced engine power
Possible fuel odors

Causes

Alternate fuel shut-off valve malfunction
Open or short circuit in control circuit
Poor contact in valve connectors
Problems with the control unit
Corroded contacts or damaged wiring

How to Fix

Check the condition of the alternative fuel shut-off valve
Check the integrity of the control circuit and the condition of the connectors
Measure valve resistance and compare with nominal
Check voltage on control circuit
If necessary, replace the valve or repair the wiring

Related codes

P2A29 P2A27 P2A26