P00CD

Code

Generic P — Powertrain

Fuel Volume Regulator Solenoid Supply Voltage Control Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 10 EN: 30 RU: 24

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Page language: EN

Causes

Short to battery/ignition feed on the FVR control wire
Damaged or corroded connector or pin at solenoid or ECM
Open or high-resistance ground or return path
Failed FVR solenoid (internal short/open)
Wiring harness damage (pinched, chafed, or melted wire)
Blown or faulty fuse or relay supplying the circuit

Symptoms

Check Engine Light (MIL) illuminated
Poor idle quality or rough running
Hard start or extended cranking
Reduced fuel economy or increased emissions
Possible limp-home mode or reduced engine performance
Intermittent driveability problems when circuit is intermittent

What to check

Read stored DTCs and freeze-frame data; note engine conditions when code set
Scan live data for FVR command (duty cycle/state) and measured voltage
Measure battery voltage and ground quality before tests
Visually inspect FVR solenoid connector and wiring for damage, corrosion, or pin push-out
Backprobe solenoid connector with key ON and engine OFF to observe supply and control voltages
Measure solenoid coil resistance and compare to factory spec

Signal parameters

Control/driver active state: circuit should be pulled low by ECM (near 0–1 V) when commanded ON (low-side driver architecture)
Inactive state: control pin may be at or near battery voltage (B+) — but ECM monitors expected transitions; persistent high when commanded low triggers code
Expected duty cycle range: 0–100% (varies by application); compare to live data/command
Solenoid coil resistance: must be within factory specification (consult service manual)
Supply voltage (battery): nominal ~12–14.5 V when engine running; control pin behavior should change when ECM commands

Diagnostic algorithm

Retrieve all codes + freeze frame; record conditions when code set. Clear codes and attempt to re-create the fault to confirm repeatability.
Perform a visual inspection of the FVR solenoid connector, wiring harness, and nearby components for heat damage, chafe, or corrosion. Repair visible damage.
With key ON (engine OFF), backprobe the solenoid connector. Identify the supply (B+) and control pins. Verify constant battery feed and control pin voltage.
Command the FVR ON/OFF from a scan tool while monitoring control pin voltage. If ECM commands low but the pin stays high (~battery), suspect short to B+ or open driver.
Measure coil resistance of the FVR solenoid (engine off, connector disconnected). Compare to service spec. If shorted/infinitely open, replace solenoid.
With ignition OFF, check continuity between the control wire and battery positive (B+). Low resistance indicates a short-to-power. Check continuity to ECM pin per service manual to isolate section of harness.

Likely causes

Short to battery (control wire tied to B+) or stuck high-power feed
Corroded/loose connector or pin causing intermittent/high voltage
Failed or shorted FVR solenoid
Open/poor ground or high-resistance connection
ECM output driver fault (less common after wiring and component checks)

Fault status

⚠️ Status

Stored when the ECM detects a higher-than-expected voltage on the Fuel Volume Regulator solenoid control/supply circuit (control wire remains high when it should be pulled low) for the required number of drive cycles.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-2.5 hours