Powertrain, generic (extended)

P22D9 Cylinder 1 Alternative Fuel Injector Control Circuit/Open

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P22D9 reports a broken control circuit at the gas injector of cylinder 1, the solenoid that meters CNG or LPG into the intake port whenever a bi-fuel or dedicated gas engine runs on the alternative fuel. The driver stage notices the break because no current flows when it switches on, or because the expected off-state voltage on its pin is missing. No maker publishes P22D9 itself: the TransEco AFCM list and Ford's 2014 code list only carry the Low/High pair P22DA/P22DB, and TransEco even files an open line under Low. GM's bi-fuel Silverado moves the injectors over to gas one by one starting with cylinder 1, so a break here tends to show up right at the changeover. Bi-fuel cars usually return to gasoline; a dedicated gas engine loses cylinder 1.

Likely causes

Open solenoid winding in the cylinder 1 gas injector
Loose, corroded or unplugged connector at the gas injector
Broken wire or failed splice in the gas system harness
Defective driver stage in the gas or engine control module

Symptoms

  • Malfunction indicator lamp on
  • Engine changes back to gasoline or refuses to switch to gas
  • Misfire on cylinder 1 in gas mode (dedicated engines)

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–400
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

alternative fuel injector

Related codes

P22DAP22DBP22DCP22DDP0201P0301

References: law.cornell.edu, static.nhtsa.gov, http:, performanceparts.ford.com.