P2923 – Fuel Cutoff Valve “A” Performance

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: General | Location: Designator A

Definition source: SAE J2012/J2012DA (industry standard)

DTC P2923 indicates the powertrain control module has detected a performance problem with Fuel Cutoff Valve “A”. A performance (range/plausibility) fault means the module commanded the valve or expected a certain response and the observed result did not behave as anticipated within its monitoring logic. The exact strategy used to judge “performance” varies by vehicle and can depend on how the valve is driven, what feedback signals are available, and what operating conditions enable the monitor. Use the appropriate service information for your platform to confirm the valve’s location, circuit routing, and the specific enable conditions before making repairs.

What Does P2923 Mean?

P2923 – Fuel Cutoff Valve “A” Performance means the control module has determined Fuel Cutoff Valve “A” is not meeting expected operational behavior. Under SAE J2012 DTC structure, “performance” points to a plausibility or response issue rather than a simple circuit open, circuit high, or circuit low condition. In practice, this can occur when the valve does not move or change flow as commanded, moves too slowly, sticks intermittently, or when related signals used to confirm operation do not correlate with the command. The code identifies a monitored mismatch; it does not, by itself, prove the valve is mechanically failed.

Quick Reference

  • Subsystem: Fuel cutoff valve “A” control and its monitored operation within the fuel delivery/shutoff strategy.
  • Common triggers: Commanded valve action not matching expected response, delayed response, inconsistent operation, or implausible correlation with related fuel system inputs.
  • Likely root-cause buckets: Wiring/connector issues, valve/actuator sticking or internal electrical faults, power/ground integrity problems, control module driver/control logic, or related sensor plausibility affecting the monitor.
  • Severity: Varies; may range from no noticeable change to hard starting, stalling, reduced power, or a no-start if fuel delivery is inhibited.
  • First checks: Confirm the code is current, review freeze-frame, visually inspect harness/connectors at the valve, verify power/ground integrity, and check for companion fuel system or plausibility codes.
  • Common mistakes: Replacing the valve without verifying command/response, ignoring connector pin fit/corrosion, skipping voltage-drop tests, or overlooking related inputs that the monitor uses for correlation.

Theory of Operation

A fuel cutoff valve is used to stop or regulate fuel flow under specific conditions, such as shutdown events, safety strategies, or system control routines. The control module typically drives the valve using a dedicated output (design varies by vehicle) and expects a predictable change in the fuel system’s behavior. Depending on design, the module may infer valve operation through pressure changes, command-versus-response timing, or correlation with other fuel system signals.

For a performance monitor, the module looks for plausibility: when it commands Fuel Cutoff Valve “A” on or off, the resulting system response should align with an expected pattern. If the response is missing, too slow, inconsistent, or contradictory to related inputs, the module flags P2923. Because this is not categorized as a circuit high/low/open fault, focus on command, response, and integrity of the circuit under load.

Symptoms

  • MIL: Check engine light illuminated; code may set as current or pending depending on monitor completion.
  • Hard start: Extended cranking or delayed start if fuel delivery is not behaving as expected.
  • Stall: Engine may stall during idle, deceleration, or transitions if fuel cutoff behavior is erratic.
  • No-start: In some cases the engine may not start if the system inhibits fuel delivery as a protective response.
  • Reduced power: Limited performance or throttle response if the module enters a protective fueling strategy.
  • Rough running: Hesitation or unstable idle if fuel flow regulation is inconsistent.

Common Causes

  • Connector issues: Loose latch, poor terminal tension, corrosion, moisture intrusion, or damaged seals at the fuel cutoff valve “A” or at the control module connector.
  • Harness damage: Chafing, pinched wiring, heat damage, or vibration wear causing intermittent continuity or unintended contact between circuits.
  • High resistance in power/ground: Partially broken conductors, internal wire corrosion, or poor ground eyelet contact that prevents the valve from achieving commanded operation.
  • Unstable supply or shared feeds: A weak shared power feed, failing relay, or blown/loose fuse connection affecting the actuator’s ability to respond (varies by vehicle design).
  • Fuel cutoff valve “A” sticking or slow response: Mechanical binding, contamination, or internal wear causing the valve to lag, stick, or fail to reach the expected position/flow when commanded.
  • Actuator internal electrical fault: Coil or motor degradation, internal short/open that alters response characteristics without being a clean “open” or “short” fault.
  • Feedback/position signal plausibility issue: If the system uses a feedback signal, the signal may be skewed or slow due to sensor degradation or reference/return circuit issues (architecture varies by vehicle).
  • Control module/logic issue: Software calibration anomaly or driver circuit performance issue causing the commanded-versus-observed behavior to fail the performance monitor (verify only after circuit and component checks).

Diagnosis Steps

Tools typically needed include a scan tool with live-data logging and bi-directional controls (if supported), a digital multimeter, and basic backprobing supplies. A wiring diagram and connector pinout from the correct service information are essential because valve type, power/ground routing, and any feedback circuit vary by vehicle. If available, use a low-amp clamp or scope to observe actuator command patterns without guessing specifications.

  1. Confirm the code and context: Scan for P2923 and record freeze-frame data, operating conditions, and any companion powertrain codes. Address battery/charging or communication-related codes first if present, because they can distort actuator performance monitoring.
  2. Check for clear, repeatable conditions: Clear codes and perform a short road test or functional run under similar conditions to the freeze-frame. If P2923 does not reset, treat it as intermittent and prioritize harness/connector inspection and live-data logging.
  3. Visual inspection of the valve and harness: Inspect the fuel cutoff valve “A” connector, harness routing, clips, and nearby hot/sharp components. Look for abrasion, crushed sections, previous repairs, and signs of moisture intrusion. Correct any obvious issues before deeper testing.
  4. Connector integrity checks: With the system powered down as required by service procedures, disconnect the valve connector and inspect terminals for spread pins, push-outs, corrosion, or damaged seals. Perform a gentle pin-drag/tension check (do not deform terminals). Re-seat and ensure positive latching.
  5. Verify commanded operation using the scan tool: If bi-directional control is supported, command the fuel cutoff valve “A” through its available functions while monitoring related PIDs. Look for delayed response, no response, or inconsistent behavior compared to repeated commands. If no active test exists, rely on live data and monitor completion behavior per service information.
  6. Power and ground availability under load: Using the wiring diagram, identify the valve’s power feed and ground path. Measure voltage at the valve side while the valve is commanded on (or during conditions when it should be active). Then perform voltage-drop testing across the power feed and across the ground path while commanded; excessive drop indicates resistance in wiring, connections, fuse/relay contacts, or grounds.
  7. Control/command circuit performance checks: If the valve is controlled by a driver circuit (low-side or high-side, varies by vehicle), check for proper switching behavior at the control pin during commanded operation using a meter or scope as appropriate. Look for erratic switching, missing command, or command present without actuator response, and avoid forcing conclusions without confirming wiring integrity.
  8. Wiggle test for intermittents: While logging live data (and ideally during an active command), gently wiggle the harness at the valve connector, along the routing, and at any intermediate connectors/grounds. If the valve status/response changes or the code sets, isolate the exact location by moving in smaller sections until the fault is repeatable.
  9. Check actuator electrical integrity: With the valve disconnected and the system safe, measure actuator resistance/continuity per service information (no universal values). Compare for consistency across repeated measurements and while lightly flexing the connector pigtail to reveal internal lead breaks. If applicable, check for shorts between terminals and to the valve housing per the diagram.
  10. Assess mechanical response: If electrical command and supply are verified but performance remains poor, evaluate whether the valve is sticking or slow. Use the scan tool command test and observe any related indicators that show delayed movement/flow response (feedback PID, inferred response, or monitor status varies by vehicle). Do not assume mechanical failure until power/ground and command circuits are proven solid.
  11. Module-side verification: If wiring and the valve test good, verify continuity end-to-end from the valve connector to the module connector, and re-check for high resistance with a loaded test where possible. Only after those checks, consider control module driver performance or software issues and follow service information for any reflash or replacement decision paths.

Professional tip: Performance faults often come from marginal connections that pass static continuity checks. Prioritize loaded testing: voltage-drop on power and ground while the valve is commanded, plus live-data logging during a wiggle test. If the fault appears only during certain operating conditions, capture a longer log around the event to correlate command, response, and supply stability before replacing components.

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Possible Fixes & Repair Costs

Repair cost for P2923 can vary widely because the underlying issue may be wiring-related, an actuator that is not responding as commanded, or a control/monitoring problem. Total cost depends on the confirmed failure, parts access, and required verification tests after repair.

  • Repair or replace damaged wiring or connectors at the fuel cutoff valve “A” (including terminal cleaning, pin-fit correction, and harness routing repairs)
  • Correct power/ground faults affecting the fuel cutoff valve “A” circuit (restore feeds, grounds, and address excessive voltage drop found during testing)
  • Replace fuel cutoff valve “A” only after confirming it fails performance checks (for example, delayed response or sticking compared to commanded operation)
  • Address mechanical binding or restriction in the valve’s mounting/actuation path if inspection shows it cannot move freely (design varies by vehicle)
  • Repair related circuit issues between the control module and the valve (high resistance, intermittent opens) verified by wiggle testing and continuity checks
  • Perform required relearn/initialization procedures if applicable by vehicle after component replacement or wiring repair
  • Update or reprogram the control module only when service information and testing indicate a calibration/logic issue and all physical faults are eliminated

Can I Still Drive With P2923?

Driving with P2923 may be possible in some cases, but it is not recommended to ignore it because a fuel cutoff valve performance problem can lead to stalling, hesitation, extended cranking, or a no-start depending on how the system is designed. If you experience stalling, reduced power, fuel-system warnings, strong fuel odor, or any condition that affects braking/steering assist due to engine instability, do not continue driving—have the vehicle inspected and repaired.

What Happens If You Ignore P2923?

If P2923 is ignored, the condition that triggered the fuel cutoff valve “A” performance fault may worsen or become more frequent, potentially resulting in intermittent or persistent starting problems, unexpected stalling, reduced drivability, and increased diagnostic complexity. Continued operation may also cause repeated fault logging and may lead the control system to apply protective strategies that limit performance.

Related Codes

  • P2902 – Diesel Particulate Filter Regeneration – Not Completed
  • P2901 – Diesel Particulate Filter Regeneration – Aborted
  • P2900 – Fuel Rail System Performance
  • P2941 – Airflow Sensor “C” Circuit
  • P2940 – Airflow Sensor “B” Circuit Intermittent/Erratic
  • P2939 – Airflow Sensor “B” Circuit High
  • P2938 – Airflow Sensor “B” Circuit Low
  • P2937 – Airflow Sensor “B” Circuit Range/Performance
  • P2936 – Airflow Sensor “B” Circuit
  • P2935 – Cylinder Deactivation System – Stuck Off (Bank 2)

Key Takeaways

  • P2923 indicates a performance issue with fuel cutoff valve “A,” meaning the commanded action and the observed result do not align as expected.
  • This is a range/performance type fault, commonly tied to response time, sticking, restriction, or signal correlation—not automatically a failed part.
  • Start with wiring, connectors, power, and ground checks, then confirm valve operation with appropriate tests.
  • Intermittent faults are common; live-data logging and wiggle testing can be critical to pinpoint the cause.
  • Replace components only after test-driven confirmation and verify the fix with post-repair checks per service information.

Vehicles Commonly Affected by P2923

  • Vehicles equipped with an electronically controlled fuel cutoff/shutoff valve in the fuel delivery or fuel tank vapor management architecture
  • Platforms with control strategies that monitor commanded valve position versus feedback, inferred flow, or system pressure behavior
  • Vehicles exposed to frequent vibration or harness movement near the fuel tank/underbody where connectors can loosen or wires can chafe
  • Applications with underbody connectors or junctions prone to corrosion from moisture, road debris, or temperature cycling
  • Systems with multiple fuel-related actuators where misrouting or cross-connection can create plausibility/performance faults
  • Vehicles that have recently had fuel-system service where connectors, seals, or harness clips may be disturbed
  • High-mileage vehicles where valve wear, contamination, or connector fretting can degrade performance over time
  • Vehicles operating in hot/cold extremes that can amplify marginal electrical connections or sticking mechanical components

FAQ

Does P2923 mean the fuel cutoff valve “A” is bad?

No. P2923 means the control module detected a performance problem with fuel cutoff valve “A,” which can be caused by wiring/connector issues, power/ground problems, or a valve that does not respond correctly. Confirm the cause with testing before replacing parts.

What’s the difference between a performance code and a circuit high/low code?

A performance code indicates the system’s observed behavior does not match the commanded or expected behavior (for example, delayed response or poor correlation). Circuit high/low codes are focused on electrical signal levels and typically indicate shorts, opens, or reference/power/ground faults that push the signal out of range.

Can a wiring issue cause a “performance” DTC like P2923?

Yes. High resistance, intermittent opens, poor terminal tension, or voltage-drop on the power/ground side can prevent the valve from operating with proper speed or force, creating a performance mismatch even if the valve itself is not mechanically failed.

What should be checked first when diagnosing P2923?

Check for related fuel-system codes and review freeze-frame data, then inspect the valve “A” connector and harness routing for damage. Next, verify power and ground integrity with voltage-drop testing and use live data (if available) to compare commanded state versus observed system response.

After repairs, how do I confirm P2923 is fixed?

Clear the code, then perform a verification drive or functional test per service information while monitoring relevant live data for the fuel cutoff valve “A” command and system response. A complete confirmation includes ensuring the monitor runs and no codes return under similar operating conditions.

For an accurate repair plan, confirm the exact fuel cutoff valve “A” location, control strategy, and verification procedure in the vehicle’s service information, since designs and monitoring logic vary by vehicle.