P2665Fuel Shutoff Valve B Control Circuit/Open
- Generic OBD-II code · Powertrain
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Engine runs only on gasoline, gas mode not available
- Fuel mode lamp flashes or shows an error
- Likely causes
- LikelyOpen valve coil
- PossibleLoose or corroded connector at the valve (often exposed under the vehicle)
- PossibleBroken wire in the control circuit
- Inspection (ITP)
- Can matter for the ITP: it concerns the emissions system.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.