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DTC codes / P02xx · Fuel and air metering (injector circuits) / P02B0

P02B0Cylinder 6 - Injector Restricted

P02B0 indicates that the powertrain control module has detected an abnormal restriction in the fuel injector circuit for cylinder 6, typically by monitoring current flow or circuit resistance and finding it outside the expected range. The restriction is electrical or mechanical within the injector itself or its wiring, not a generic misfire code, and it tells you the computer sees the injector as not flowing the commanded amount of fuel.

SystemPowertrain
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaFuel and air metering (injector circuits)

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms besides the warning light
  • Rough idle or a noticeable vibration that feels like a miss at idle and low speeds
  • Hesitation or stumble during acceleration, especially when the engine is under load
  • Reduced fuel economy as the engine compensates for a lean or rich condition on one cylinder
  • Occasional hard starting or a slight surge at steady cruise if the restriction is intermittent
  • A faint fuel odor or exhaust smell in some cases when the injector is stuck partially closed

Common causes, most likely first

  1. Clogged or restricted fuel injector nozzle due to fuel varnish or debris
  2. Failed fuel injector solenoid winding, causing high or low circuit resistance
  3. Damaged or corroded injector pigtail connector or terminal tension loss
  4. Chafed or open injector harness wire between the PCM and the injector
  5. Internal PCM driver fault for that injector circuit, though this is less common
  6. Contaminated fuel or a failing fuel filter that sends debris to the injector
  7. A shorted injector coil that draws excessive current and sets the restriction code

How to diagnose and fix it

  1. Verify the code with a scan tool and check for related misfire or fuel trim codes before touching any parts
  2. Inspect the cylinder 6 injector connector and harness for corrosion, chafing, or loose terminals
  3. Measure injector resistance with a multimeter and compare it to the manufacturer's specification
  4. Perform an injector balance or flow test, or use a noid light to confirm the PCM is commanding the injector
  5. Run a fuel pressure and volume test to rule out a supply restriction upstream of the injector
  6. Remove and flow-test or replace the cylinder 6 injector if electrical and fuel supply checks pass
  7. Clear the code and perform a road test to confirm the repair and ensure the code does not return

Why cylinder 6 injector codes get misdiagnosed

  • A restricted injector can pass a resistance test because the coil is fine while the nozzle is clogged, so electrical checks alone will miss the fault.
  • Technicians often replace the injector when the real problem is a corroded connector pin that adds resistance and mimics a restricted injector.
  • P02B0 can be set by a fuel pressure problem upstream, so always check supply pressure before condemning the injector.
  • An intermittent harness chafe may only set the code on rough roads, so wiggle-testing the harness while watching live data is essential.
  • This code does not always mean the injector is bad; a PCM driver fault or a shorted coil can set the same restriction code.

Can I keep driving with P02B0?

You can usually drive the vehicle to a repair shop, but avoid heavy acceleration and towing because a restricted injector can cause a lean condition that damages the catalytic converter over time. If the check engine light begins flashing, stop driving and have the vehicle towed.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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