P2665 — Fuel Shutoff Valve "B" Control Circuit/Open

P2665 — Fuel Shutoff Valve "B" Control Circuit/Open. A fault in the sensor and actuator circuits. The car is usually drivable while you plan the repair. Typical causes: open or shorted wiring in the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P2665 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the fuel shutoff valve "B" control circuit/open for damage, corrosion, chafing or poor contact.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2665 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2665 (parts and labor, USD, independent shop rates): Control module repair: $300–$1,000; Repair wiring or connectors: $80–$250; Replace the faulty sensor or actuator: $150–$500. Overall, fixing P2665 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Is it safe to drive with P2665?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

What is the most common cause of P2665?

The most common causes are: open or shorted wiring in the circuit, corroded, loose or damaged connector, faulty sensor or actuator of the affected circuit.

Will P2665 clear itself?

Sometimes P2665 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How do I diagnose P2665 myself?

Start with a scan: confirm P2665, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the sensor and actuator circuits, and verify the suspect component against live data before buying parts.

What are the symptoms of P2665?

Drivers most often notice: increased fuel consumption in some cases, Check Engine Light on, the affected system operates intermittently or not at all, possible limp mode depending on the affected component.

What does P2665 mean?

When P2665 appears on a scan, it means the control module has flagged a problem in the sensor and actuator circuits: fuel shutoff valve "B" control circuit/open. The fault sits in the powertrain (engine/transmission) group of the OBD2 standard.

This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2665 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.

What causes P2665?

poor ground connection
corroded, loose or damaged connector
blown fuse feeding the circuit
control module driver fault
faulty sensor or actuator of the affected circuit
open or shorted wiring in the circuit

Common symptoms of P2665

increased fuel consumption in some cases
Check Engine Light on
the affected system operates intermittently or not at all
possible limp mode depending on the affected component

How to diagnose P2665

Connect an OBD2 scanner, confirm P2665 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Visually inspect the wiring harness and connectors related to the fuel shutoff valve "B" control circuit/open for damage, corrosion, chafing or poor contact.
Measure reference voltage, ground and signal continuity at the component connector.
Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2665 does not return.

How to fix P2665

Start with the cheapest and most common causes before replacing expensive parts:

Control module repair — $300–$1,000
Repair wiring or connectors — $80–$250
Replace the faulty sensor or actuator — $150–$500

How much does it cost to fix P2665?

Repair cost depends on which component actually failed. Typical scenarios for P2665 (parts and labor, USD, independent shop rates):

Control module repair: $300–$1,000
Repair wiring or connectors: $80–$250
Replace the faulty sensor or actuator: $150–$500

Overall, fixing P2665 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2665?