P2667

Code

Generic P — Powertrain

Fuel Shutoff Valve B Control Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 32 EN: 36 RU: 24

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Page language: EN

Causes

Open or damaged wiring in the fuel shutoff valve B control circuit
Short to battery positive on the control wire
Corroded or loose connector at the valve or PCM
Failed fuel shutoff valve (coil/solenoid) with internal open or high impedance
Poor ground for valve or related circuits
Faulty PCM or driver transistor (less common)

Symptoms

Engine may crank but not start or hard to start (if valve fails closed)
No fuel flow or intermittent fuel enable to injectors/fuel pump circuit depending on system design
MIL (check engine) illuminated
Possible fuel delivery limp mode or shutdown

What to check

Read and record freeze frame and live data for relevant parameters before clearing codes
Visually inspect wiring harness and connectors at fuel shutoff valve B and PCM for damage, corrosion or pinched wires
Check for related DTCs that may indicate a shared circuit problem
With key off, disconnect connector and inspect pins for corrosion, bent pins or insulation damage
Use a DMM to backprobe the control wire with ignition ON and with the PCM commanding the valve (or use actuator test)

Signal parameters

Expected behavior (generic): when PCM commands valve ON (active) the control driver should pull the circuit to the driver level (typically near 0–1.0 V for a low-side driver). When OFF the circuit will be at near battery voltage (approximately battery voltage).
Fault condition: voltage on the control wire remains higher than expected during an ON command (often >1.5–2.0 V) or is at constant battery voltage when the PCM expects a low value.
Valve coil resistance (typical): many shutoff solenoids measure from roughly 1 Ω to several tens of ohms — consult vehicle-specific spec. If coil is open/infinite, it indicates a failed valve.

Diagnostic algorithm

Retrieve freeze frame and any related codes; record conditions when code set (battery voltage, engine temperature, key position).
Perform a visual inspection of wiring and connectors at fuel shutoff valve B and along the harness to the PCM. Repair obvious damage.
With ignition OFF, disconnect the valve connector. Measure coil resistance across the valve terminals. Compare to manufacturer spec; infinite or very high resistance indicates a bad valve.
With ignition ON (engine OFF) backprobe the control terminal at the valve connector and monitor voltage while commanding the valve ON via an actuator test or by cranking if safe. Expected: low voltage (near 0–1 V) when commanded ON for a low-side driver. If voltage stays high, suspect wiring short to +12V or open/failed driver.
Check for short to battery: with connector disconnected, measure voltage between the control wire and ground. If battery voltage is present with PCM not commanding, there is a short to B+.
Check continuity from the valve connector control pin to the PCM pin. Repair any open circuits. Also check continuity to ground for the valve return if applicable.
If wiring and valve check good, perform a bench test of the valve by applying proper rated voltage/ground to verify operation. Replace valve if it fails to operate.
If wiring and valve are good and no short to B+ is found, test the PCM driver output with an oscilloscope or substitute known-good PCM if available. Replace PCM only after confirming external circuits are correct.
Clear codes and perform a road test or repeat the operational test to confirm the repair. Monitor battery voltage during tests; unstable supply can affect results.

Likely causes

Connector at fuel shutoff valve B loose, corroded, or pinned incorrectly
Control wire chafed and shorted to constant +12V or ignition feed
Valve coil open/failed causing unexpected voltage reading at PCM
Ground return for valve is poor or open, causing high measured circuit voltage
PCM driver failed or stuck (verify last after wiring and component tests)

Fault status

⚠️ Status

PCM detected high voltage on Fuel Shutoff Valve B control circuit — possible short to battery, open/failed valve, poor connector/ground, or PCM driver fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours