Code
P0282
GWM
P — Powertrain
- Cylinder 8 injector low
AI status
Completed
Completed
100%
Causes
- Damaged, corroded or loose injector connector
- Short to ground in the injector wiring for cylinder 8
- Open circuit or high resistance in wiring between ECM and injector
- Failed fuel injector (internal short or coil fault)
- Failed or weak ECM injector driver output for cylinder 8
- Blown fuse, faulty relay, or low battery voltage affecting injector circuit
Symptoms
- Check Engine Light / MIL illuminated
- Rough idle or misfire at cylinder 8
- Loss of engine power, hesitation or poor acceleration
- Increased fuel consumption or visible smoke (diesel engines)
- Hard starting or extended crank time
- Possible stored misfire codes (e.g., cylinder 8 misfire)
What to check
- Read and record full freeze-frame and related codes; note operating conditions when code set
- Visual inspection of injector 8 connector and wiring harness for damage, corrosion, melted insulation or pinched wires
- Check battery voltage and fuses/relays related to fuel/injector circuits
- Measure injector coil resistance at the connector (with harness unplugged) and compare to OEM spec
- Back-probe injector connector while cranking/starting or use a noid light to confirm injector pulse
- Use a multimeter/oscilloscope to check for pulsed drive signal and appropriate voltage levels at the injector
Signal parameters
- Key ON, engine OFF: reference feed to injector connector typically near battery voltage (~12 V); confirm nominal voltage per OEM
- While cranking/operating: injector driver is usually a pulsed ground (voltage will alternate between near-battery and near 0 V when active)
- Expected injector coil resistance varies by engine: common values are ~2–3 Ω (low-impedance) or ~10–16 Ω (high-impedance). Check OEM spec before replacement
- Noid light pulse indicates injector drive; oscilloscope shows a pulsed waveform (duty varies with load/engine conditions)
Diagnostic algorithm
- Confirm the code and note freeze-frame data. Clear codes and attempt to re-run to verify repeatability.
- Perform a careful visual inspection of the injector 8 connector, pins and wiring route. Repair any visible damage before further electrical tests.
- With ignition OFF, disconnect the injector and measure coil resistance across injector terminals. Compare to OEM spec. Replace injector if out of tolerance.
- With harness connected, back-probe the injector connector. With key ON (engine OFF) verify reference voltage present at the feed terminal (~battery voltage).
- Crank or run engine and use a noid light or oscilloscope to confirm the ECU is commanding the injector (pulsed signal present). If no pulse, test upstream control (ECM/PCM fuse/relay, crank/ECU grounds).
- If no pulse and fuses/relays OK, check continuity between the ECM driver pin and the injector connector; check for shorts to ground or B+. Repair wiring as needed.
- If the driver is pulsing correctly and wiring is good but resistance was out of spec, replace the injector and retest.
- If wiring and injector appear good but driver output at the ECM is abnormal (stuck low or shorted), consider ECM driver fault. Verify with a known-good injector swap or bench test before replacing ECM.
- After repairs, clear codes and test-drive under conditions similar to freeze-frame. Re-scan to confirm code does not return.
Likely causes
- Corroded/loose terminal at cylinder 8 injector connector
- Wiring shorted to ground (chafing or pinched harness near engine or subframe)
- Injector coil internal short or degraded winding
- ECM low-side driver failure on cylinder 8 output
Fault status
Status
Engine control module detected a low voltage condition on the cylinder 8 injector circuit (P0282). Inspect wiring, connector, injector and ECM driver.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 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