P22EE

Code

Generic P — Powertrain

Cylinder 6 Alternative Fuel Injector Control Circuit Low

Brand: Generic

Type: P — Powertrain

Views: UK: 26 EN: 42 RU: 27

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Short to ground on the injector control wiring
Open or high-resistance wiring or connector to injector
Corroded/loose injector connector or poor pin contact
Failed alternative-fuel injector (internal short or coil fault)
Blown fuse or bad relay supplying injector rail
Poor ECM/PCM ground or supply voltage issue

Symptoms

Check Engine Light (MIL) illuminated
Possible misfire on cylinder 6 or rough idle
Reduced performance or drivability issues under load
Poor fuel economy (if alternative fuel system affected)
No start or hard start in extreme cases if circuit is open/shorted

What to check

Read stored freeze frame and confirm P22EE and any related codes (P0206, P0266, misfire codes)
Visually inspect wiring harness and connector at cylinder 6 alternative injector for corrosion, damage, water intrusion or pin push-out
Check fuses and relays for the alternative fuel injector supply circuit
Backprobe injector connector and check for battery/ignition voltage at supply pin with key ON (engine OFF)
Backprobe control/driver pin while cranking/running to confirm pulsed signal or low-side switching (use DMM or scope)
Measure injector coil resistance and compare to manufacturer spec or other cylinders

Signal parameters

Injector coil resistance (typical range): ~1–16 ohms depending on injector type — compare to other cylinders
Supply voltage at injector supply pin: battery voltage (approx. 12 V) with key ON
Control/driver behavior: pulsed low-side switching from ECM — driver low typically near 0 V during ON pulses
Pulse width: varies by engine load and RPM (few ms to several ms) — should be comparable to other cylinders under same conditions
No-load/idle pulses should be present when engine is cranking/running if cylinder commanded

Diagnostic algorithm

Retrieve DTC(s) and freeze-frame data. Note engine conditions when fault set (rpm, temp, fuel type).
Perform a visual inspection of the cylinder 6 alternative injector, connector, and harness for damage, corrosion, fluid intrusion, or rodent damage. Repair obvious damage before further testing.
Verify power supply: with key ON (engine OFF) backprobe the injector supply terminal — it should have battery voltage. If missing, check related fuse/relay and wiring to fuse/relay.
Verify control signal: backprobe the injector control pin while cranking or running. Use a lab scope if available. Confirm the ECM is commanding pulses and that the control waveform resembles other cylinders.
Measure injector coil resistance at the connector (unplugged). Compare to spec or identical injector on another cylinder. Very low resistance suggests shorted coil; very high or open suggests open winding.
Check for short to ground: with connector disconnected, check resistance from control pin to chassis ground; low resistance indicates short to ground in harness. Also check continuity from control pin to ECM pin (consult wiring diagram) to isolate location of fault.
Perform a wiggle/strain test on harness while monitoring signal to identify intermittent breaks or shorts. Repair any damaged sections.
If wiring, supply, and grounds check good and injector resistance is within spec, substitute the suspect alternative injector with a known-good injector or swap places with another cylinder (if safe and compatible) and see if code follows the injector.
If the fault follows the injector, replace the injector. If the fault stays with the cylinder position, repair wiring/connector or replace ECM if bench-tested and proven faulty.
After repair, clear codes and perform a road test under the same conditions. Re-scan to confirm the code does not return.
Notes: use manufacturer wiring diagrams and connector pinouts. When testing with a meter, be cautious not to short pins; when using a scope, follow safe probe practices.

Likely causes

Damaged chafed wiring or pin shorted to chassis ground
Corroded/contaminated injector connector or bent pins
Failed alternative-fuel injector coil (low resistance or short)
Loss of 12V supply or blown fuse/relay feeding the injector
Faulty ECU/PCM output driver (less common)

Fault status

⚠️ Status

P22EE — Cylinder 6 Alternative Fuel Injector Control Circuit Low: low voltage detected on the injector control circuit for cylinder 6; possible short to ground, open/high resistance, faulty injector, supply or ECM driver issue.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours