P0302 Code: Chevrolet Cruze (2016-2019) - Causes, Symptoms & Fixes

No recalls found in NHTSA database

Note on data: The provided NHTSA data for the Chevrolet Cruze (2016-2019) shows no owner complaints specifically for P0302 and no recalls listed. This guide uses general automotive diagnostic knowledge for P0302 on this vehicle and acknowledges that the data set contains no complaint counts to rely on. Real-world experience and service manuals should be used in conjunction with this guide.

CODE MEANING AND SEVERITY

• Code meaning: P0302 = Cylinder 2 misfire detected. The engine control module (ECM) has detected that cylinder 2 is not burning air-fuel mix properly.
• Severity and symptoms: Misfires reduce engine performance, cause rough running, and can trigger the MIL (Check Engine Light). Persistent misfires can damage the catalytic converter due to unburned fuel entering the exhaust, and they can cause overheating of exhaust components. If the misfire worsens or is accompanied by other misfire codes, drivability will worsen and fuel economy will drop.

COMMON CAUSES ON CHEVROLET CRUZE

Note: The Cruze (2016–2019) commonly uses a 1.4L turbocharged engine in many trims and may also feature different spark plug/coil arrangements depending on specific engine family. Typical causes for P0302 include:

• Spark plug issue on cylinder 2: worn, fouled, incorrectly gapped, or damaged spark plug.
• Ignition coil or coil-on-plug failure for cylinder 2: faulty coil, bad wiring, or poor connection to the coil boot.
• Fuel injector problem for cylinder 2: injector stuck open/closed or leaking; injector wiring or driver circuit issue.
• Wiring/connector problems: damaged/oxidized connector or harness to the ignition coil or injector, causing intermittent signal to cyl 2.
• Vacuum leak or intake leak near cylinder 2: leaks can cause lean misfire or irregular air delivery.
• Low fuel pressure or fuel supply issue: failing fuel pump, clogged fuel filter, or fuel pressure regulator fault can affect one or more cylinders.
• Compression issues in cylinder 2: worn piston rings, valve seating problems, blown head gasket, or cam/valve timing concerns (less common but possible).
• Carbon buildup on direct-injection engines: carbon deposits on intake valves (particularly in direct-injected engines) can contribute to misfire in some cylinders over time.
• Other related problems: faulty engine ground, PCM/ECU intermittent fault (rare), or misinterpreted fault trees when multiple codes are present.

SYMPTOMS

• MIL illuminating or flashing light (likely steady) with P0302 stored in the PCM.
• Rough idle, engine shake, or stumble, especially at idle or low throttle.
• Reduced power and acceleration, especially under load.
• Increased or erratic fuel consumption.
• Occasional hesitation or surging during acceleration.
• In some cases, a related cylinder misfire codes (P0300, P0301, P0303, etc.) may accompany P0302.
• Sometimes the misfire is more noticeable when the engine is cold or under load, and may disappear at higher RPMs if the misfire is intermittent.

DIAGNOSTIC STEPS

Use a methodical, evidence-based approach. When performing steps, clear codes after each diagnostic action to verify results, and only drive short distances if necessary to retrieve data. If you are not confident with high-voltage ignition systems or fuel systems, seek professional help early.

Step 0: Confirm and gather data

• Use a scan tool to confirm P0302 and check for related codes (P0300, P0202 = injector circuit problem on cylinder 2, P0352 = ignition coil secondary circuit issue for cylinder 2, etc.).
• Review freeze frame data for rpm, engine load, fuel trim (short-term and long-term), misfire counts, coolant temperature, and throttle position at the time of the fault.

Step 1: Visual inspection

• Inspect spark plug in cylinder 2 (and coil boot) for fouling, oil contamination, gap wear, or physical damage.
• Inspect ignition coil and coil connector for signs of corrosion, damaged seals, or signs of heat damage.
• Check for damaged, cracked, or disconnected wiring to the spark plug coil and injector for cylinder 2; look for chafed harnesses, loose connectors, or bent pins.
• Check vacuum hoses and intake manifold gaskets around cylinder 2 for leaks.
• Look for oil leaks or coolant leaks near the cylinder 2 area, which can indicate gasket/seal issues.

Step 2: Spark plug and coil swap test (to isolate cylinder 2 component)

• If you have confidence and access to the engine, swap the spark plug from cylinder 2 with cylinder 1 (or another cylinder) or swap the ignition coil from cylinder 2 with another cylinder. After clearing codes, run the engine and see if the misfire follows the plug/coil. If the misfire moves to the new cylinder, the plug or coil is the faulty component.
• If you have a coil-on-plug design, you can swap the entire coil from cylinder 2 to cylinder 3 or 1 to test for movement of misfire.

Step 3: Spark plug replacement (if plug appears worn or fouled)

• If you determine the spark plug is degraded, replace it with the recommended spec (correct heat range and plug type for the Cruze engine). Re-gap if required and ensure proper seating torque.
• After replacement, clear codes and road-test to see if P0302 reappears.

Step 4: Coil testing (if plug passed or coil suspected)

• Measure coil primary and secondary resistance according to the service manual. Compare readings to GM tolerances (a faulty coil usually shows abnormal resistance).
• If resistance is out of spec, replace the coil on cylinder 2. Re-test.

Step 5: Fuel system checks

• Check injector 2 function: use a noid light to verify the injector driver signal during engine running; listen for injector clicking with a stethoscope; or use an injector pulse test tool.
• Check injector resistance (static), and verify there is no leakage or seepage when the injector is de-energized.
• If injector 2 test fails, replace the injector or perform a professional cleaning if recommended by the manual.

Step 6: Fuel pressure and delivery

• Check fuel pressure when the engine is running. Compare to the factory specification for the 1.4L turbo Cruze (and any variant in your market). Low fuel pressure can cause misfires across cylinders or specific cylinders.
• If fuel pressure is low, diagnose fuel pump, fuel filter, pressure regulator, or wiring to the pump.

Step 7: Compression and combustion analysis

• Perform a compression test on all cylinders, paying close attention to cylinder 2. A significantly lower compression on cylinder 2 indicates mechanical problems (valve seating, ring seal, head gasket, etc.).
• If compression is low on cylinder 2, perform a leak-down test to determine the source (intake valve, exhaust valve, piston rings, or head gasket).

Step 8: Additional checks

• Check for carbon buildup on intake valves (especially in direct-injected engines). If carbon deposits are suspected and symptoms align, consider intake-valve cleaning or more specialized service recommended by the dealer.
• Check for torque-to-specs on cylinder 2 related fasteners (intake manifold bolts) that could cause vacuum leaks.
• Review data for misfire counters in the scan tool; if misfire persists under load, consider more advanced drivability analysis.

Step 9: Decide on repairs

• If a single component (spark plug, coil, or injector) is faulty, replacement usually resolves P0302.
• If no single component is defective, a broader investigation into fuel delivery, compression issues, or valve/seal problems may be necessary.
• If repeated misfires occur in multiple cylinders or if the engine experiences frequent stalling or loss of power, a PCM/ECU fault or internal engine problem may be considered, necessitating professional diagnosis.

RELATED CODES

• Common related misfire codes: P0300 (Random/Multiple Cylinder Misfire), P0301 (Cylinder 1 misfire), P0303 (Cylinder 3 misfire), P0304 (Cylinder 4 misfire), P0305–P0309 (other cylinders).
• Engine-circuit related codes that could accompany P0302:
  • P0202 (Injector Circuit Malfunction – Cylinder 2)
  • P0352 (Ignition Coil Secondary Circuit – Cylinder 2)
  • P0351 (Ignition Coil A Secondary Circuit – Cylinder 1) and other P035x variants if the ignition coil circuit is suspect.
• Note: The presence of related codes can help narrow the fault to injector/coil wiring or a mechanical issue. Always verify with live data and perform component-level tests.

REPAIR OPTIONS AND COSTS (2025 PRICES)

Prices are estimates for the United States market and can vary by region, shop, and parts choice (OEM vs aftermarket). All prices are for parts and labor combined unless otherwise stated.

• Spark plug replacement (cylinder 2)

  • Parts: 4 plugs (if a full set is recommended) – $8–$15 each; total $32–$60.
  • Labor: 0.5–1.0 hours.
  • Estimated total: $100–$180.

• Ignition coil replacement (cylinder 2)

  • Part: Coil-on-plug per cylinder – $60–$120.
  • Labor: 0.5–1 hour.
  • Estimated total: $120–$260 (sometimes combined with plug replacement if both are replaced).

• Fuel injector service (cylinder 2)

  • Injector test/clean (professional cleaning service) – $50–$150.
  • Replacement injector (if needed) – $50–$150 for the part.
  • Labor to replace injector – 1.0–2.0 hours.
  • Estimated total: $200–$500 (depending on whether cleaning suffices or an injector replacement is required).

• Fuel system and filter service

  • Fuel filter replacement (if applicable to engine variant) – $50–$150 including labor.

• Vacuum leak repair

  • Hose/PCV valve/gasket repair – $20–$100 parts; $60–$120 labor.

• Carbon buildup/intake cleaning (direct-injection engines)

  • Walnut blast or specialized cleaning – $500–$1,000; may be higher at dealer or specialized shops.

• Compression test and/or leak-down test

  • Diagnostic service: $100–$200 (often applied toward the repair bill if following major diagnostics).

• General repairs (if mechanical issues found on cylinder 2)

  • Valve/seat work, piston ring repair, or head gasket replacement can run well into the thousands depending on scope.

• Recalls/TSBs

  • No recalls found in NHTSA database for this data set. No TSBs cited here since none appear in the provided data.

DIY vs PROFESSIONAL

• DIY-friendly tasks (if you are comfortable with car electrical and basic engine work):
  • Replacing spark plugs on a typical Cruze cylinder is a common DIY task; you can swap a coil or plug with basic tools if you have the right specifications and torque values.
  • Basic visual inspections, cleaning, and testing with a basic multimeter/noid light can be within reach for many hobbyists.
• Tasks generally recommended for a professional or advanced DIY:
  • Diagnosing intermittent misfires with ignition coils, as a fault could be electrical and high voltage is involved.
  • Checking and testing fuel injectors, fuel rail pressure, and high-pressure fuel system, or diagnosing fuel pump/pressure regulators without proper equipment.
  • Compression and leak-down testing, cam/crank timing checks, or suspect valve/seat problems.
  • Intake-valve carbon buildup cleaning for direct-injection engines often requires specialized equipment (e.g., walnut blasting) and technician expertise.
• Safety: If you’re not confident with high-voltage ignition systems, high-pressure fuel systems, or engine disassembly, seek professional service. Misdiagnosis can lead to further damage.

PREVENTION

• Regular maintenance:
  • Replace spark plugs at the interval specified by Chevrolet for the 2016–2019 Cruze (likely around 60,000–100,000 miles depending on model and plug type). Use the recommended heat range and plug type (usually iridium or platinum on modern direct-injection engines).
  • Replace ignition coils only if diagnosed as faulty; avoid replacing multiple coils unnecessarily.
• Fuel and intake care:
  • Use top-tier gasoline and avoid frequent fuel stabilizers in engines that sit unused for long periods.
  • Consider occasional fuel-system cleaners to help prevent injector deposit buildup (follow manufacturer recommendations; do not overuse cleaners).
  • Be mindful of direct-injection valve carbon buildup; if you notice symptoms of valve deposits (misfire under light load, rough idle after cold start), discuss intake valve cleaning with a professional.
• Air and vacuum maintenance:
  • Replace the air filter at recommended intervals.
  • Inspect and replace cracked vacuum hoses and PCV valves to prevent leaks.
• Electrical checks:
  • Ensure battery terminals are clean and connections are tight; a weak battery can cause ignition related issues and charging system faults.
• Driving habits:
  • Short trips that don’t allow the engine to reach proper operating temperature can contribute to deposit buildup and misfires; regular longer drives help.

Important data caveat

• The data provided shows no NHTSA complaints and no recalls for this code/vehicle in the supplied record. This guide uses general diagnostic knowledge applicable to P0302 on the 2016–2019 Cruze and should be supplemented with official service information (GM service manuals, TSBs) and hands-on diagnostics for your specific vehicle.