P2665 code meaning
Fuel Shutoff Valve B Control Circuit/Open
What P2665 means
Engines that can burn a second fuel such as compressed natural gas use electric shut-off valves to keep that fuel locked in when it is not wanted. GM's 2015 Impala Bi-Fuel has two of them, both normally closed: a high-pressure cut-off at the tank and a low-pressure cut-off at the regulator, which the ECM energises only in CNG mode while the engine cranks or runs. P2665 means the control circuit of shut-off valve B is open, so the module cannot energise that valve. Ford's 2014 spark-ignition code list includes P2665 as a continuous test without MIL. Which physical valve carries the letter B is not published by either maker. With the valve unpowered, the gaseous fuel stays shut off and the engine typically falls back to gasoline. P0005 is the same fault on valve A.
P2665 at a glance
- Check engine lightUsually not
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2665
- Engine runs only on gasoline, gas mode not available
- Fuel mode lamp flashes or shows an error
Common causes of P2665
- Most likelyOpen valve coil
- PossibleLoose or corroded connector at the valve (often exposed under the vehicle)
- PossibleBroken wire in the control circuit
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Fuel shutoff valve bSolenoidWiring harness
What each part of P2665 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 6 | Area: computer (engine control module) and output circuits. |
| 65 | The exact fault in that area. |
What to do next
- Note P2665 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2665
What does P2665 mean?
P2665 means "Fuel Shutoff Valve B Control Circuit/Open". Engines that can burn a second fuel such as compressed natural gas use electric shut-off valves to keep that fuel locked in when it is not wanted. It is a generic code, so it means the same on every make.
Is it safe to drive with P2665?
Drive gently and only to a workshop. With P2665 the car can go into limp mode (reduced power) to protect itself.
Will P2665 fail an emissions test?
Yes, it can. P2665 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2665 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P2665 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.