P2A92

Code

Generic P — Powertrain

Alternative Fuel Tank Select Valve A Control Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 21 EN: 33 RU: 25

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Page language: EN

Causes

Stuck or mechanically obstructed tank select valve A
Failed valve solenoid or internal coil open/short
Open, shorted or corroded wiring in the valve control circuit
Poor or lost ground or supply voltage to the valve
Faulty connector or pin corrosion/loose terminal
Failed relay or blown fuse in the valve supply circuit

Symptoms

Check Engine/MIL illuminated with P2A92 stored
Vehicle may not switch between primary and alternative fuel tanks
Possible fuel supply irregularity or drivability complaints if fuel source cannot be selected
Audible clicking when commanding valve may be absent or abnormal
Possible fuel system warning messages in vehicle display

What to check

Retrieve freeze frame and related DTCs with a scan tool; note conditions when DTC set
Attempt to actuate Valve A using a bi-directional scan tool; observe response and listen for clicking
Visually inspect valve connector and harness for corrosion, damage, dirt, or water intrusion
Check related fuses and relays for continuity and proper operation
Measure supply voltage to the valve with ignition ON (should be near battery voltage if feed is switched)
Backprobe control circuit while commanding valve; verify control signal (voltage or ground switching / PWM)

Signal parameters

Control type: usually switched 12 V or PCM-driven ground/pulse-width (PWM) — exact method depends on vehicle
Expected activation voltage: near battery voltage on the supply feed when ignition is ON; control line may switch to ground or 12 V when commanded
Valve coil resistance: typically in the single-digit to low double-digit ohm range (example 5–50 Ω) — consult OEM spec
Current draw when activated: typically several hundred mA to a few amps (varies by design)
When commanded by scan tool, a functioning valve usually produces an audible click and/or measurable change in valve position or system pressure

Diagnostic algorithm

Connect a scan tool, read and record P2A92 and any related codes; record freeze-frame data and attempt to reproduce fault conditions.
With ignition ON (engine OFF), command the valve ON/OFF from the scan tool while a second person listens near the valve for actuation. Note whether valve clicks or moves.
Visually inspect the valve connector and wiring for damage, corrosion, or water ingress. Repair or clean as needed.
Check supply fuse(s) and related relay(s). Verify supply voltage at the valve feed with ignition ON. Replace faulty items.
Backprobe control and supply terminals while commanding valve: verify supply (battery voltage), control switching (ground or 12 V) and compare to expected behavior.
With connector disconnected and ignition OFF, measure valve coil resistance. If resistance is out of manufacturer spec (open or shorted), replace the valve.
If electrical tests are normal but valve does not move, remove and bench-test valve with appropriate safe bench power to verify mechanical operation. Replace if stuck or mechanically failed.
Inspect fuel lines, actuators and related mechanics for blockages or seized linkages that would prevent valve movement; repair as required.
If wiring is suspect (open/short/intermittent), perform connector pin-to-PCM continuity and short-to-power/ground tests; repair harness as needed.
If wiring and valve bench tests are good, consider PCM output driver fault—verify with manufacturer procedures and replace PCM only after confirming all upstream components/function are good.
Clear codes, perform functional tests and road test to confirm repair. Re-scan to ensure code does not return.