P2924 – Fuel Cutoff Valve “B” Control Circuit/Open

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: Circuit/Open | Location: Designator B

Definition source: SAE J2012/J2012DA (industry standard)

DTC P2924 indicates the powertrain control module has detected an open circuit condition in the Fuel Cutoff Valve “B” control circuit. “Circuit/Open” faults are electrical in nature: the module is not seeing the expected continuity, current flow, or circuit response when it commands the valve circuit, so it interprets the circuit as disconnected or unable to carry signal/load. How the vehicle reacts can vary by vehicle, including whether the fault sets immediately, becomes pending first, or requires multiple drive cycles. Always confirm circuit routing, connector views, pin functions, and test specifications using the correct service information for the exact vehicle.

What Does P2924 Mean?

P2924 – Fuel Cutoff Valve “B” Control Circuit/Open means the powertrain controller has identified an open-circuit condition in the control circuit for Fuel Cutoff Valve “B.” Per SAE J2012 DTC conventions, this points to an electrical circuit integrity problem (such as a break, disconnection, or poor terminal contact) rather than a confirmed mechanical fault. The controller typically runs a commanded-output and/or circuit feedback check; if the circuit cannot be driven or the expected electrical response is missing, it records the code. The “B” designation indicates a specific valve/channel as defined by the vehicle’s wiring and component layout.

Quick Reference

  • Subsystem: Fuel cutoff valve “B” control circuit (powertrain-controlled actuator circuit).
  • Common triggers: Unplugged connector, broken/partially broken conductor, poor terminal fit, corrosion at terminals, damaged harness near heat/movement points.
  • Likely root-cause buckets: Wiring/connector faults; power or ground feed issues to the valve circuit (as applicable); failed fuel cutoff valve coil/open internal connection; less commonly driver circuit/module fault.
  • Severity: Potential for no-start, stall, reduced drivability, or protective fuel shutoff behavior; severity depends on how the system is implemented.
  • First checks: Visual inspection of valve “B” connector and harness; verify connectors fully seated/locked; check for rubbed-through wiring; scan data/command test if supported.
  • Common mistakes: Replacing the valve without proving an open in wiring/terminals; ignoring intermittent opens from harness movement; confusing an open circuit with a “stuck valve” mechanical issue.

Theory of Operation

A fuel cutoff valve is an electrically controlled device used to enable or interrupt fuel flow or fuel system operation, depending on vehicle design. The powertrain controller commands the valve via a dedicated control circuit and expects an electrical response consistent with a connected load (for example, a measurable current draw or feedback state). Some systems use a power feed with a module-switched ground; others use a module-switched power feed; exact architecture varies by vehicle.

For a “Circuit/Open” determination, the controller’s diagnostic logic generally looks for missing circuit continuity or lack of expected electrical behavior when the output is commanded. An unplugged connector, damaged conductor, poor pin contact, or an open valve coil can prevent current flow and cause the controller to flag P2924.

Symptoms

  • Check engine light: MIL/SES lamp illuminated; code may be stored as pending or confirmed depending on monitor strategy.
  • No-start: Engine may crank but not start if the system defaults to fuel shutoff or cannot enable required fuel operation.
  • Stalling: Engine may stall unexpectedly if fuel cutoff control is lost during operation.
  • Reduced power: Limited performance or protective mode if the controller disables certain functions due to the fault.
  • Extended crank: Longer-than-normal cranking if fuel system enabling is delayed or inconsistent.
  • Intermittent behavior: Symptoms may appear over bumps or during engine movement if an intermittent open exists in the harness or connector.

Common Causes

  • Open circuit in the Fuel Cutoff Valve “B” control wire (broken conductor inside insulation, pulled wire, or harness damage)
  • Loose, unplugged, or partially seated connector at the Fuel Cutoff Valve “B”, related junction, or control module
  • Connector terminal problems (spread terminals, poor pin fit, backed-out terminals, corrosion) causing an open condition
  • Open in the valve’s internal coil or actuator winding (electrically open component)
  • Open power feed or open ground path for the valve circuit (varies by vehicle wiring design)
  • High resistance that effectively behaves like an open (damaged splice, fatigued wire strands, overheated terminal)
  • Harness chafing at brackets or tight bends leading to intermittent open during engine movement
  • Control module driver circuit fault or damaged module connector/terminal (verify wiring first before condemning a module)

Diagnosis Steps

Tools that help: a scan tool capable of viewing freeze-frame and live data (and bi-directional output control if supported), a digital multimeter, and wiring diagrams/service information for connector pinouts and circuit routing. A test light can help with basic power/ground checks where appropriate. Have back-probing tools, terminal inspection picks, and supplies for proper wiring repair.

  1. Confirm the DTC is P2924 and note whether it is current or history. Record freeze-frame data and any related DTCs. If other power supply, ground, or communication codes are present, address those first because they can create false “circuit/open” results.
  2. Clear codes and perform a short key cycle/road test while monitoring live data for the fuel cutoff valve command/status (names vary by vehicle). If P2924 resets immediately with key-on or during an output test, treat it as a hard open rather than intermittent.
  3. Perform a focused visual inspection of the Fuel Cutoff Valve “B” and its harness: look for an unplugged connector, broken lock tabs, harness tension, abrasion points, and recent work areas. Repair obvious issues, then retest.
  4. Inspect connector terminals on both sides (valve and harness). Look for corrosion, moisture intrusion, bent pins, backed-out terminals, and poor pin fit. Correct terminal tension/fit issues and ensure full connector seating; then clear codes and retest.
  5. Wiggle test: with the engine running (or key-on if the engine won’t run) and a scan tool logging relevant PIDs, gently wiggle the harness and connector near the valve, along the routing, and at junctions. If the command/status changes or the DTC sets during movement, isolate the exact section that reproduces the fault.
  6. Check the valve component for an open winding: disconnect the Fuel Cutoff Valve “B” connector and measure resistance across the valve’s terminals per service information. If the circuit reads open/out of range, the valve may be electrically open and should be confirmed by substituting a known-good component or following the OEM test procedure.
  7. Verify circuit continuity end-to-end for the control circuit: using the wiring diagram, test continuity between the control module pin and the valve connector pin. If continuity is missing, locate the open by splitting the harness at intermediate connectors and testing segment-by-segment.
  8. Perform a voltage-drop test under load on the power and ground paths that supply the valve (design varies by vehicle). Command the valve on with bi-directional control if available, or run the condition where it is normally commanded. Excessive drop indicates resistance that can act like an open; repair the affected feed/ground, splice, or terminal.
  9. If the wiring checks good, verify the circuit can carry current: reconnect everything and back-probe safely (per service info) while commanding the valve. Confirm the power feed, ground integrity, and the presence of a switching/control signal where applicable. If the harness supports the load but control is absent, continue to module-side checks.
  10. Inspect the control module connector for terminal damage or poor pin fit at the circuit involved. If a pin is backed out or corroded, correct it and retest. Only after all circuit and terminal checks pass should a control module driver issue be considered, following service information for confirmation steps.

Professional tip: Many “circuit/open” faults are caused by terminal tension or a conductor broken inside the insulation near the connector strain relief. If continuity looks fine with the harness resting, repeat continuity and voltage-drop checks while gently flexing the harness in the exact area where it bends or is clipped; this often reveals an intermittent open that static testing misses.

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Possible Fixes & Repair Costs

Repair costs for P2924 vary widely because the fault can be as simple as a loose connector or as involved as harness repair and circuit verification. Total cost depends on diagnostic time, access to the fuel cutoff valve “B” circuit, required parts, and labor rates.

  • Secure and reseat connectors at the fuel cutoff valve “B” and the controlling module; ensure terminals are fully locked and not backing out.
  • Repair open circuits by fixing broken wires, damaged insulation, or poor splices in the valve “B” control circuit and related grounds/feeds.
  • Clean or replace terminals if corrosion, fretting, or loss of pin tension is found; restore proper terminal fit to eliminate an “open” condition.
  • Replace the fuel cutoff valve “B” only after confirming the actuator coil/circuit is open or out of specification per service information.
  • Repair power/ground distribution faults such as damaged fuse links, poor ground points, or connector damage that prevents the circuit from being driven correctly.
  • Repair harness routing issues (chafing, heat damage, pinch points) and add appropriate protection to prevent recurrence.
  • Control module intervention (reflash, configuration, or replacement) only if all external circuit checks pass and service information supports module-level diagnosis.

Can I Still Drive With P2924?

P2924 indicates an open in the fuel cutoff valve “B” control circuit, which can lead to fuel delivery control issues that vary by vehicle. If the engine stalls, will not start, loses power unexpectedly, or any safety warnings appear (such as reduced power affecting braking/steering assistance), do not drive; have the vehicle towed and diagnosed. If it drives normally, limit driving, avoid high-demand conditions, and schedule prompt diagnosis because an open circuit can become intermittent and fail without warning.

What Happens If You Ignore P2924?

Ignoring P2924 can allow a wiring or connector open to worsen into a more frequent or permanent failure. Depending on how the system is implemented, you may experience intermittent stalling, a no-start condition, reduced performance, or repeated check engine warnings. Continued operation with an unresolved open circuit can also complicate diagnosis later by introducing secondary faults and may increase the chance of being stranded.

Related Codes

  • P2911 – Exhaust Aftertreatment Fuel Injector Stuck On
  • P2910 – Exhaust Aftertreatment Fuel Injector Circuit Range/Performance
  • P2909 – Exhaust Aftertreatment Fuel Injector Circuit High
  • P2908 – Exhaust Aftertreatment Fuel Injector Circuit Low
  • P2907 – Exhaust Aftertreatment Fuel Injector Circuit/Open
  • P2906 – Exhaust Aftertreatment Fuel System Performance
  • P2905 – Airflow Too High
  • P2904 – Airflow Too Low
  • P2903 – Diesel Particulate Filter Regeneration – Too Frequent
  • P2902 – Diesel Particulate Filter Regeneration – Not Completed

Key Takeaways

  • P2924 is a Circuit/Open DTC for the fuel cutoff valve “B” control circuit, pointing to an electrical open rather than a performance or “high/low” fault.
  • Wiring and connectors are top suspects, including poor pin fit, corrosion, unplugged connectors, and harness damage.
  • Confirm with testing using visual inspection, continuity checks, wiggle testing, and voltage-drop checks per service information.
  • Replace parts only after proof that the valve or circuit is actually open; avoid guessing based on symptoms alone.
  • Driving risk varies; unexpected stall or no-start potential means prompt diagnosis is recommended.

Vehicles Commonly Affected by P2924

  • Vehicles with electronically controlled fuel cutoff systems where a module commands one or more cutoff valves.
  • Vehicles with multiple fuel control actuators that label components as “A” and “B” circuits.
  • High-mileage vehicles with increased likelihood of harness fatigue, terminal wear, and corrosion.
  • Vehicles operated in harsh environments where moisture, road salt, dust, or heat accelerates connector and wiring degradation.
  • Vehicles with recent engine or fuel-system service where connectors may be left loose or wiring may be pinched during reassembly.
  • Vehicles with prior collision or underbody damage that can stretch, crush, or chafe wiring looms.
  • Vehicles with frequent vibration exposure that can promote fretting corrosion and intermittent opens at terminals.
  • Vehicles with modified wiring (aftermarket splices or repairs) that can introduce poor connections and opens over time.

FAQ

Does P2924 mean the fuel cutoff valve “B” is bad?

No. P2924 specifically indicates the control circuit is detected as open. An open can be caused by a disconnected plug, broken wire, poor terminal tension, corrosion, a blown feed issue, or an internal open in the valve. Testing is required to confirm the failed point.

What is the difference between “Circuit/Open” and “Circuit High/Low”?

“Circuit/Open” points to a loss of electrical continuity (unplugged connector, broken conductor, poor pin fit). “Circuit High” or “Circuit Low” usually indicates the circuit is being pulled toward power or ground, often by a short or an abnormal load. The diagnostic approach for P2924 should stay focused on finding the open.

Can a loose connector set P2924 intermittently?

Yes. A partially seated connector, terminal that has backed out, or weak terminal tension can open the circuit under vibration or temperature changes. This is why a careful connector inspection and a controlled wiggle test are important when diagnosing P2924.

Will clearing the code fix P2924?

Clearing the code only resets stored fault information; it does not repair an open circuit. If the underlying open remains, the monitor will typically detect the fault again and the code will return, sometimes immediately depending on the vehicle’s diagnostic strategy.

What should I check first when I see P2924?

Start with the basics: verify connectors are fully seated at the fuel cutoff valve “B” and along the harness, inspect for damaged wiring or corrosion, and check related fuses/feeds and grounds. Then confirm the open with continuity and voltage-drop testing according to service information.

After repairs, verify the fix by clearing the code, running the appropriate drive cycle or function test (varies by vehicle), and confirming the fuel cutoff valve “B” control circuit remains stable with live-data logging and a final visual recheck of connector locking and harness routing.