What causes fault code P02C6?

• Most likely: Defective or dirty fuel injector for cylinder 11 (leaking/stuck open) • Likely: Short to ground in the injector control circuit (keeping it energized) • Possible: Ignition system misfire on cylinder 11 (unburnt fuel detected as rich mixture) • Rare: Mechanical engine problem affecting cylinder 11 compression • Rare: Internal ECM hardware or software fault

How do you fix fault code P02C6?

STEP 1: Check for related misfire codes (P0311). If present, troubleshoot ignition components first. STEP 2: Use a diagnostic scan tool to perform a fuel injector balance test. Monitor fuel rail pressure after shutdown; pressure should hold steady (leak-down test). STEP 3: Check wiring harness. With ignition ON/Engine OFF, there should be 12V supply. Ensure the control wire is not shorted to ground. STEP 4: Remove the injector and bench test for spray pattern and leakage (must be zero drops under pressure). STEP 5: Replace faulty injector and clear ECU fuel adaptation values.

Powertrain (Engine & Gearbox)Standard EOBD

P02C6 - Cylinder 11 Injector - Leaking

Q: What are the symptoms of fault code P02C6?

• Check engine light (MIL) illuminated • Rough idle and engine misfires • Hard starting (especially when warm due to fuel flooding) • Increased fuel consumption and raw fuel smell from exhaust • Reduced engine performance and black smoke from tailpipe • Will cause emission test failure during inspection

Last updated:1 February 2026

Related:Fuel Injector Cylinder 11, Spark Plug, Oxygen Sensor, Fuel Pressure Sensor, ECM/ECU

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0200

Injector Circuit Malfunction

P0201

Cylinder 1 Injector Circuit Open

P0202

Injector Circuit - Cylinder 2 - Malfunction

P0203

Injector Circuit - Cylinder 3

Technical Description

DTC P02C6 is stored when the Engine Control Unit (ECU) detects that the fuel injector for cylinder 11 is leaking or stuck partially open. The ECU monitors the fuel trims and individual cylinder contribution; if it reaches a 'rich limit' (maximum negative correction) for cylinder 11, it concludes that the injector is not sealing correctly. This can lead to unburnt fuel entering the exhaust stream, risking catalyst overheating and engine oil dilution.

Possible Causes

Defective or dirty fuel injector for cylinder 11 (leaking/stuck open)

Short to ground in the injector control circuit (keeping it energized)

Ignition system misfire on cylinder 11 (unburnt fuel detected as rich mixture)

Mechanical engine problem affecting cylinder 11 compression

Internal ECM hardware or software fault

Symptoms

Check engine light (MIL) illuminated

Rough idle and engine misfires

Hard starting (especially when warm due to fuel flooding)

Increased fuel consumption and raw fuel smell from exhaust

Reduced engine performance and black smoke from tailpipe

Will cause emission test failure during inspection

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P02C6 - Cylinder 11 Injector - Leaking

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P02C6 - Cylinder 11 Injector - Leaking

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