HIGH System: Ignition & Misfire System SAE J2012 Standard

P0302: Cylinder 2 Misfire Detected

The ECM tracks crankshaft deceleration specifically during the combustion cycle of Cylinder #2. On inline engines, Cylinder 2 is the second cylinder from the front timing cover.

Driveability & Safety Advisory

Drive short distance to service facility only. Avoid heavy acceleration to protect catalytic converter.

Official Manufacturer TSB Advisories

Hyundai 19-FL-002 Target: 2015–2019 Hyundai Sonata / Tucson (2.0T / 2.4L)

Factory Condition: Spark plug gap erosion on Cylinder 2 causes spark blowout under highway turbo boost.

OEM Service Remedy: Install revised high-durability NGK spark plugs with reduced 0.028-inch gap.

Physical Component Location & Service Access

Second cylinder back from the front timing chain cover on 4-cylinder engines.

Electrical Specifications & Live PID Benchmarks

Scan Tool Live Data Targets

Cylinder 2 Misfire Count: > 10 counts / 1,000 revs

Short Term Fuel Trim: +8% to +18%

Digital Multimeter (DMM) Specs

Ignition Coil Resistance: 0.8 – 1.3 Ohms primary

Injector Resistance: 11.8 – 14.5 Ohms

Documented Model-Specific Case Studies

2012–2017 Chevrolet Cruze (1.4L Turbo)

Root Cause: Ignition coil pack rail internal resistor failure above Cylinder 2 boot.

Verified Fix: Replace complete integrated 4-cylinder coil pack assembly and all spark plugs.

Technician Inspection & Testing Workflow

Swap Cylinder 2 coil with Cylinder 1. Check if trouble code follows coil.

Check spark plug condition on Cylinder 2 for fuel wetting or carbon fouling.

Check injector pulse with noid light.

Cost Breakdown

DIY Replacement Parts: $35 – $95

Independent Repair Shop (Parts + Labor): $180 – $380

Standard Diagnostic Time: 1.0 – 2.0 Flat-Rate Hours

Tools & Parts Matrix

Recommended Parts: Ignition coil, Spark plug

Required Test Tools: Socket set, Scan tool, Feeler gauge

Diagnostic Questions & Answers

Should I replace all ignition coils if only Cylinder 2 is bad?

If the vehicle has over 100,000 miles, replacing all coils is good preventative maintenance, but replacing just the single failed coil is completely fine if on a budget.