Code
P0202
GWM
P — Powertrain
- Injector malfunction - cylinder 2
Views:
UK: 19
EN: 26
RU: 35
AI status
Completed
Completed
100%
Causes
- Open or short in injector wiring (broken wire, chafing, short to ground or battery)
- Poor or corroded connector pins at injector or harness
- Failed fuel injector (stuck, electrically open, shorted coil)
- Faulty engine control module (ECM)/injector driver
- Low or no battery/charging system voltage during operation
- Related power/ground circuit fault
Symptoms
- Malfunction Indicator Lamp (MIL/Check Engine) illuminated
- Rough idle or vibration, especially at idle
- Reduced engine power or hesitation under load
- Increased fuel consumption and higher emissions
- Misfire detected on cylinder 2 (may show P0302)
- Possible hard start or no start if injector is completely inoperative
What to check
- Retrieve DTCs and freeze frame/live data with scan tool; note related codes (e.g., P0302, fuel trim issues)
- Visual inspection of injector connector, wiring harness and pin condition for cylinder 2
- Check battery and charging system voltage (reference 12V+ supply at key ON/running)
- Measure injector coil resistance (spec depends on engine) and compare to spec
- Use a multimeter/oscilloscope to check injector drive signal (pulse width, frequency, switching voltage)
- Perform continuity and short-to-ground/battery checks on injector wiring back to ECM
Signal parameters
- Injector coil resistance (ohms) — compare to GWM spec for that engine
- Injector pulse width (ms) — varies with load and RPM; view on scope or live-data
- Injector driver voltage: switching between ~0V and battery voltage (key ON/running)
- PWM duty cycle or command frequency (if applicable on high‑impedance/PWM injectors)
- Battery/system voltage (V) during cranking and running
- Waveform shape on oscilloscope (clean switching edges, no excessive noise or dropouts)
Diagnostic algorithm
- Read and record P0202 and any additional DTCs; note freeze frame and misfire counts.
- Visually inspect cylinder 2 injector connector and harness for corrosion, bent pins, damage, or loose connections.
- With ignition OFF, disconnect injector connector and measure injector coil resistance; compare to spec. If open or short, replace injector.
- With backprobe or scope, check for proper injector driver signal with key ON and while cranking/running: confirm pulse present and switching voltage within expected range.
- Check for continuity from injector connector to ECM pin and test for short to ground/battery; repair any wiring faults.
- Swap cylinder 2 injector with another known-good injector: if the code moves to the other cylinder, replace the injector; if it stays on cylinder 2, suspect wiring or ECM.
- Verify power and ground circuits feeding the injector bank (fuse, relay, ground straps).
- If wiring and injector are good and signal from ECM is absent or abnormal, test ECM injector driver output and consider ECM fault (consult service manual for ECM bench test/replacement procedure).
- After repairs, clear DTCs and test drive to confirm code does not return and engine runs smoothly.
Likely causes
- Damaged/loose connector or wiring to cylinder 2 injector
- Failed injector coil (open or short)
- Short to ground or battery in injector harness
- ECM injector driver fault (less common)
- Low system voltage or poor ground affecting injector operation
Fault status
Status
Injector circuit malfunction detected for cylinder 2 — open/short/intermittent electrical fault or injector failure.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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