P22E3

Code

Generic P — Powertrain

Cylinder 3 Alternative Fuel Injector Control Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 24 EN: 48 RU: 32

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Page language: EN

Causes

Open or high-resistance wiring between ECM and cylinder 3 alternative fuel injector
Short to battery/constant 12V on the injector control lead
Corroded or loose injector connector or damaged pins
Failed alternative-fuel injector (internal short/open)
Faulty ECM / injector driver transistor
Poor ground or power supply to the fuel injector bank or ECM

Symptoms

Check Engine Light illuminated and P22E3 stored
Cylinder 3 misfire or rough idle (especially when running on alternative fuel)
Reduced engine power, hesitation, or poor driveability under load
Poor fuel economy or incomplete switch to alternative fuel mode
Possible hard start or extended cranking when using alternative fuel

What to check

Retrieve freeze frame and readiness status with a scan tool; note fuel mode (alternative fuel vs gasoline) and conditions when code set
Visually inspect wiring and connector at cylinder 3 injector for corrosion, damage, or loose pins
Check for related DTCs for other injectors, powertrain, or fuel control
Wiggle test harness with key on / engine off and observe live data for sudden voltage changes
Compare cylinder 3 injector current or status to other injector channels using a scan tool (if supported)

Signal parameters

Expected inactive (injector off) voltage at injector control pin: approximately battery voltage (~11–14.5 V)
Expected active (injector on) voltage at control pin for low-side drivers: close to 0 V (typically
Injector pulse width: varies with load and RPM (commonly 1–20 ms per pulse in sequential systems)
Typical injector coil resistance: compare to manufacturer spec (commonly a few ohms to tens of ohms); large deviation indicates faulty coil

Diagnostic algorithm

Record freeze-frame data and confirm the vehicle was on alternative fuel when the code set. Note any related codes. 2) Perform a visual inspection of cylinder 3 injector connector and wiring harness. Check for pin damage, corrosion, melted insulation, or chafing points. 3) With ignition OFF, disconnect the injector connector and measure injector coil resistance with a multimeter; compare to the vehicle-specific spec. Replace injector if out of range. 4) Check connector harness continuity between the injector control pin and the ECM connector pin. Also check for continuity to battery positive (short-to-power) and to chassis ground (unintended short-to-ground). Repair any opens/shorts. 5) With a powered scan tool, command cylinder 3 alternative injector ON and OFF while monitoring the injector circuit voltage and injector control status. Observe the voltage change; a stuck-high voltage when commanded ON indicates open circuit or short-to-Vb. 6) Use a lab scope (preferred) or high-speed multimeter to view injector driver waveform at the control pin while cranking/running. Compare waveform to a known-good cylinder or manufacturer examples. 7) Swap the suspect injector with another cylinder’s alternative-fuel injector (if identical) and see if the fault follows the injector. If it moves to the new cylinder, replace the injector. If it stays at cylinder 3, continue wiring/ECM diagnostics. 8) Inspect and test ECM ground(s) and power supply circuits. If wiring is good and injector is good, suspect a faulty ECM driver—verify with manufacturer procedures before ECM replacement. 9) After repair, clear codes, run vehicle to operating conditions, and confirm the code does not return and the system operates normally.

Likely causes

Broken or disconnected control wire at connector or along harness to cylinder 3
Injector connector pin pushed out, corroded, or bent causing poor contact
Injector coil is open or has internal fault raising circuit voltage
Short to battery (constant 12V) on the control circuit due to chafing or pin contact
ECM driver failed and is not pulling the circuit low when commanded

Fault status

⚠️ Status

PCM/ECM detected an abnormally high voltage on the Cylinder 3 alternative fuel injector control circuit. This indicates the circuit is not being driven to the expected low voltage when the injector is commanded ON and may be caused by wiring, connector, injector, or module faults.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours