P22E2

Code

Generic P — Powertrain

Cylinder 3 Alternative Fuel Injector Control Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 32 EN: 41 RU: 38

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Page language: EN

Causes

Short to ground in the injector control wire for cylinder 3
Open or high-resistance/poor connection at the injector connector (corrosion, pin damage)
Failed alternative-fuel injector (shorted coil or internal fault)
Failed driver inside the ECM/PCM
Blown/weak fuse or faulty relay supplying injector battery feed
Damaged wiring harness from chafing or heat

Symptoms

Malfunction Indicator Lamp (MIL) illuminated (Check Engine Light)
Rough idle or misfire felt on cylinder 3
Reduced power, hesitation or poor drivability under load
Engine may not switch to alternative fuel or will cut back to primary fuel
Increased fuel consumption and emissions
Possible limp-mode or reduced performance mode depending on vehicle

What to check

Read freeze frame and pending codes with a scan tool; check readiness and related codes
Perform a visual inspection of harness, connectors and pins at cylinder 3 injector and along the harness for damage or corrosion
Check fuses and relays related to the alternative fuel system and injector power supply
Backprobe the injector connector with key ON and while commanding injector with an appropriate bi-directional scan tool
Measure continuity/ resistance between injector control pin and ECM pin with connector disconnected (ignition OFF)
Wiggle test harness while monitoring live data to find intermittent faults

Signal parameters

Injector supply (battery feed) with key ON (not cranking): approximately battery voltage (~12 V); check service data for exact value
Control/driver line when idle (not commanded): high-impedance or near battery voltage (if high-side) or open; when commanded: pulse to near 0 V for low-side drivers
Typical injector coil resistance: manufacturer-specific — consult service data (general injector coils commonly range from ~1–20 ohms depending on type)
With the injector disconnected, control circuit should NOT be held to ground; a steady ~0 V indicates a short to ground or stuck driver
Oscilloscope: pulsed square or rounded pulses when commanded; flat low-level or permanent 0 V indicates fault

Diagnostic algorithm

Connect a scan tool, record freeze-frame and live PIDs related to cylinder 3 and alternative fuel system. Clear code and attempt to reproduce if safe.
Visual inspection: inspect cylinder 3 injector connector, wiring, and nearby harness for damage, corrosion, pin distortion, or signs of overheating.
Check fuses/relays for the alternative fuel/injector power circuit; verify battery feed to injector supply pin with ignition ON.
Backprobe the injector control pin with ignition ON and view live data while commanding the injector with a bidirectional tool: verify control goes to pulsed ground (or the expected logic) when commanded.
With ignition OFF, measure resistance/continuity between the injector control pin and the ECM control pin. Expect continuity and no short to ground. If short to ground exists with injector disconnected, isolate between connector sections to locate short.
Disconnect the injector. Measure the control circuit voltage with key ON: if still low (near 0 V), suspect short to ground or ECM driver fault. If circuit becomes open/high, suspect failed injector.
Swap the alternative-fuel injector from cylinder 3 with a known-good injector from another cylinder (if compatible). If the code follows the injector, replace the injector. If it stays with cylinder 3, concentrate on wiring/ECM.
If wiring appears OK and short persists when injector disconnected, test ECM driver output per OEM procedure. Replace ECM only after confirming wiring and injector faults are excluded.
After repair, clear codes and road-test to confirm the fault does not return and related drivability issues are resolved.

Likely causes

Corroded/loose connector at cylinder 3 alternative-fuel injector
Chafed wiring contacting chassis ground near cylinder 3
Failed injector coil presenting low impedance to ground
Faulty ECM/PCM low-side driver for cylinder 3
Blown fuse or intermittent power/ground to injector supply

Fault status

⚠️ Status

P22E2 — Cylinder 3 Alternative Fuel Injector Control Circuit Low. The control circuit for the cylinder 3 alternative-fuel injector is reporting a low/grounded condition or abnormal low-voltage behavior. Inspect wiring, connector, injector and ECM driver.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours