Code
P0264
GWM
P — Powertrain
- Cylinder 2 injector low
AI status
Completed
Completed
100%
Causes
- Faulty or intermittent fuel injector (cylinder 2)
- Open or shorted wiring in the injector harness (open to ground, short to ground, or short to battery)
- Poor connector contact, corrosion or bent pins at injector connector
- Faulty injector driver inside the ECM/ICM
- Blown fuse or bad power/ignition relay that feeds injector power rail
- Low system battery voltage or poor battery/ground connections
Symptoms
- Malfunction Indicator Lamp (MIL) on
- Rough idle or misfire felt at idle or under load
- Reduced power, hesitation or poor acceleration
- Hard starting or extended cranking
- Increased smoke or unusual exhaust odor
- Possible increased fuel consumption
What to check
- Read stored DTCs and freeze-frame data with a scan tool; note conditions when code set
- Visual inspection of injector 2 connector and wiring for corrosion, damage, or loose pins
- Verify battery voltage and engine ground integrity
- Measure injector coil resistance (cold) at injector 2 and compare to spec
- Back-probe injector connector while cranking to check supply voltage and control pulse
- Use an oscilloscope to inspect injector drive waveform for cylinder 2
Signal parameters
- Injector coil resistance: consult vehicle service manual. Typical ranges: low-impedance injectors ~1–3 ohms; high-impedance injectors ~10–16 ohms (measure and compare to spec)
- Connector supply voltage (key ON): approx. battery voltage (~11.5–14.5 V)
- Injector drive signal: pulsed low-side switching from ECM. Expect pulsed voltage transition and current when cranking/running; pulse width varies with load (ms)
- Ground/continuity: low resistance path to ground (wire and connector continuity typically
- When injector commanded, oscilloscope should show a clean switching waveform without excessive noise or dropped pulses
Diagnostic algorithm
- Read and record DTC(s) and freeze-frame data. Note engine speed, coolant temp, battery voltage when code set.
- Visually inspect the cylinder 2 injector, connector, and harness for damage, corrosion, loose pins, or water ingress; repair as needed.
- Verify battery voltage and major engine grounds are clean and tight.
- Check fuses and relays associated with the fuel injector power supply.
- With ignition OFF, measure injector 2 coil resistance at the injector body. Compare to service manual specification.
- With key ON (engine OFF) back-probe the injector power terminal and verify battery voltage is present at the supply pin.
- Back-probe the control (driver) pin while cranking or running. Use a multimeter to confirm pulsing; use an oscilloscope to inspect waveform for missing pulses, shorted signal, or excessive noise.
- Perform continuity check from ECM injector driver pin to injector connector pin; check for shorts to battery or ground and for excessive resistance.
- Swap injector 2 with a known-good injector from another cylinder (if practical) and re-scan. If code follows the physical injector, replace the injector. If code remains on cylinder 2, focus on wiring/ECM.
- If wiring and injector check good but problem persists, test/replace the injector driver module or ECM per service manual procedures.
- After repair, clear DTCs and perform a road or engine run test to confirm the fault does not return and trims/live data are normal.
Likely causes
- Corroded or loose injector connector at cylinder 2
- Damaged wiring harness (chafe, pinched, rodent damage) to injector 2
- Failed injector solenoid on cylinder 2
- Open or high resistance ground or supply to injector rail
Fault status
Status
Cylinder 2 injector circuit low voltage detected by ECM. MIL ON. Possible misfire or reduced performance.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email