Code
P0288
GWM
P — Powertrain
- Low Cylinder Injector 10 Circuit Range
AI status
Completed
Completed
100%
Causes
- Damaged or shorted wiring in the injector 10 harness (low to ground or high resistance)
- Poor or corroded connector at injector 10 or at the ECM harness
- Faulty injector (stuck open, shorted coil, internal fault)
- Faulty ECM injector driver for cylinder 10
- Low battery/poor battery connections or weak charging system causing low supply voltage
- Aftermarket wiring, repairs, or connectors with poor termination
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated (check engine light)
- Rough idle or misfire related to cylinder 10
- Reduced engine power, hesitation or poor acceleration
- Hard starting or extended cranking time
- Increased fuel consumption and higher emissions
- Possible audible irregularity from the affected cylinder
What to check
- Read and record freeze frame/live-data and related PIDs with a scan tool (injector pulse width, commanded vs actual)
- Visually inspect injector 10 harness and connector for damage, corrosion, stretching or pinch points
- Check battery voltage and charging system before testing (low supply can affect readings)
- Measure injector coil resistance at the connector and compare to manufacturer spec
- Backprobe injector connector and check for proper reference voltage and switching signal while cranking/starting
- Check ECM harness connector pins for corrosion, bent pins, or moisture
Signal parameters
- Injector coil resistance: manufacturer-specific (typical solenoid injectors often ~0.5–3.0 ohms; verify GWM spec before replacement)
- Injector driver voltage: reference/supply typically battery voltage on the supply side; driver switches to ground on low-side circuits
- Injector pulse width: varies with engine load and RPM; should show commanded pulses in live data during cranking and running
- Cranking voltage: should remain stable (≥11.5 V) during tests to avoid misleading low-voltage indications
- No-load idle current/pulse behavior: injector should respond to commanded pulses without open-circuit or short-to-ground symptoms
Diagnostic algorithm
- Confirm the DTC and capture live data / freeze frame. Note engine conditions (cranking, idle, load) when the fault set.
- Visually inspect injector 10 connector and wiring for damage, corrosion, or loose pins; repair any damage and clear code to retest.
- Check battery and charging system; ensure adequate voltage during tests.
- With ignition off, measure injector 10 coil resistance at the connector and compare to GWM specification. If out of range, replace the injector.
- With a safe method (backprobe connectors), with ignition on or engine cranking, measure supply and driver signals: confirm supply voltage present and that the ECM is switching the driver to ground when commanded.
- Wiggle test wiring while monitoring live-data or using a DVOM/oscilloscope to detect intermittent opens/shorts. Repair harness as required.
- Swap injector 10 with another cylinder’s injector (if identical) and re-scan. If the DTC follows the injector, replace the injector; if it remains on cylinder 10, suspect wiring or ECM.
- If wiring and injector check good, test/inspect ECM connector pins for driver circuit faults. Replace or repair ECM only after confirming driver failure with proper bench/diagnostic testing or manufacturer guidance.
- After repairs, clear codes and perform a road/run test to confirm code does not return and that drivability is restored.
Likely causes
- Open or short in the low-side injector wiring to cylinder 10
- Corroded or loose connector pins at the injector or ECM
- Injector coil resistance out of specification (shorted or high resistance)
- ECM driver transistor degraded or failed for cylinder 10
- Intermittent ground or battery supply issue affecting injector drive
Fault status
Status
ECM detected an abnormally low or out-of-range signal from the injector 10 circuit. The problem may be wiring/connectors, the injector itself, supply voltage, or the ECM driver. Perform electrical and component checks before replacing major parts.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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