P2371

Code

Generic P — Powertrain

Fuel Volume Regulator B Control Circuit Performance

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 36 RU: 20

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Open or short in regulator B control wiring (open, short to ground, short to battery)
Poor or corroded connector or pin at the regulator or PCM
Failed fuel volume regulator (solenoid/valve) B
Low battery or poor power/ground to regulator or PCM
Intermittent wiring damage from chafing, heat, or vibration
PCM fault or software issue

Retrieve freeze frame and live data with a scan tool; confirm P2371 and any related DTCs
Inspect wiring and connector at fuel volume regulator B for corrosion, breaks, or pins pushed out
Check for obvious fuel leaks and physical damage to the regulator or harness
Verify vehicle battery voltage and charging system health
Attempt to reproduce fault while monitoring live data (fuel rail pressure, commanded duty, status)

Control signal: typically PWM from PCM; expected behavior — duty cycle varies 0–100% under command (actual values are vehicle-specific)
Typical control frequency range (example): 50–500 Hz (verify OEM spec before relying on value)
Supply voltage at regulator connector (ignition ON): near battery voltage (~12 V) on the power feed circuit
Signal/command circuit voltage when inactive: near 0V or low measured to PCM ground; when commanded may see pulsed voltages up to battery voltage (back-probe to confirm)
Typical coil/solenoid resistance (typical range): ~5–30 ohms (varies by design) — measure and compare to factory spec

Record freeze frame and related codes; note conditions when code set.
Visually inspect connector and wiring at regulator B; repair any obvious damage or corrosion.
With ignition off, disconnect regulator B and measure resistance across the regulator terminals; compare to manufacturer spec (if unknown, note if open/infinite or shorted).
Check supply circuit: with ignition ON, verify battery voltage present at regulator power feed (use back-probing).
Check ground: verify good ground continuity from regulator ground to chassis/PCM ground.
Back-probe the control/signal terminal with engine running (or using an active test) and observe waveform with lab scope or high-speed multimeter: verify PWM frequency/duty changes when PCM commands and that waveform matches expected behavior.
While commanding different duty cycles (via bidirectional scan tool if available), observe fuel rail pressure or flow response to confirm regulator is functionally responding to commands.
If wiring and connector tests pass but regulator is out of spec electrically or functionally, replace the fuel volume regulator B and clear codes.
After repair, road-test and monitor live data for proper regulator response and no recurrence. If wiring and regulator check good and code persists, consider PCM reflash or replacement as last resort.
Document repairs and verify related codes are not present.