P22F6: Cylinder 8 Alternative Fuel Injector Control Circuit Low

Cylinder 8 is the last cylinder with a generic gas injector code; beyond it the Altech-Eco/TransEco table for the Ford 6.8 V10 switches to manufacturer codes. P22F6 reports a control line for the cylinder 8 valve that is too low. That table counts a short to ground as well as an open line here, with MIL on bi-fuel vehicles only, and Ford's 2014 code list includes the code with MIL. For the driver the effect depends on the fault: a grounded line may keep gas flowing into cylinder 8 and enrich it, a broken one shuts it off. Either way the misfire shows up only in gas mode, which helps separate it from a gasoline injector fault such as P0208. Repair starts with the plug and harness at that valve.

High severity. Can I keep driving?If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.

Cylinder 8 is numbered according to the manufacturer: check your engine's manual before working on it.

Symptoms

Check engine light on (bi-fuel versions)
Misfire on cylinder 8 only in gas mode
Gas mode not available

Most likely causes

Cylinder 8 control wire grounded through damaged insulation
Open wire or unplugged injector (reported as Low)
Cylinder 8 gas injector coil defective

What to check, in order

Start with the simplest. You can tick off each step.

If you smell gas, shut off the supply, ventilate and do not start the engine
With the connector unplugged, check whether the signal wire is making contact with ground.
Read the codes with a compatible scanner
Check the connectors and wiring of the component indicated
Leave any work on the gas circuit to an authorized shop

Good to know

Repair difficulty: medium
It can trigger limp mode.
It affects emissions.

What each character of P22F6 means

P: Powertrain: engine and transmission
2: Generic code: same on every make
2: Fuel injection
F6: Specific fault in that system

Frequently asked questions

Can I keep driving with code P22F6?

If you smell gas, do not keep driving or start the engine: move away and call for assistance. With no smell, drive moderately to an authorized shop.

What causes code P22F6?

The most common causes are: cylinder 8 control wire grounded through damaged insulation; open wire or unplugged injector (reported as Low); cylinder 8 gas injector coil defective.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.