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Home / DTC / P02B0 — Cylinder 6 - Injector Restricted

P02B0 — Cylinder 6 - Injector Restricted

Detailed page for trouble code P02B0.

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P02B0

Generic P — Powertrain

Cylinder 6 - Injector Restricted

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or partially blocked injector nozzle (deposits, varnish, debris)
  • Restricted fuel supply to the injector (blocked screen, clogged filter, collapsed feed hose)
  • Contaminated fuel (particles, varnish, gelled fuel)
  • Internal injector mechanical failure (stuck pintle/valve, collapsed internal filter)
  • High fuel temperature or low fuel pressure reducing flow
  • Faulty injector driver or PCM command (inconsistent pulse or current limiting)

Symptoms

  • Rough idle and vibration, especially at cold start or idle
  • Check Engine Light illuminated with P02B0 stored
  • Cylinder 6 misfire codes (P0306) or reduced contribution from cylinder 6
  • Loss of power under load or uneven acceleration
  • Increased fuel consumption or smoke (diesel applications)

What to check

  • Read freeze frame and pending counts with a scan tool; confirm P02B0 is stored and note conditions
  • Visual inspection of fuel lines, rail, injector connector and wiring for damage, corrosion or loose connections
  • Check fuel filter condition and fuel supply items (in-tank strainer, feed hoses) for restriction
  • Measure fuel rail pressure and confirm within specification during cranking and operation
  • Perform injector resistance and continuity check and compare to specification
  • Perform a cylinder contribution or balance test to confirm reduced flow from cylinder 6

Signal parameters

  • Injector pulse width / commanded duration from PCM (ms)
  • Injector duty cycle (%) under various loads
  • Injector coil DC resistance (Ω)
  • Injector current draw during opening (A) and peak current behavior
  • Fuel rail pressure (kPa or psi) and stability under load
  • Intake/fuel temperature (°C) if fuel properties affect flow

Diagnostic algorithm

  1. Safety: work in a well-ventilated area, relieve fuel system pressure per manufacturer procedure, wear eye protection and follow shop safety rules.
  2. Verify code: connect a capable scan tool, record freeze-frame and pending codes, then clear codes and re-run to reproduce.
  3. Visual/wiring: inspect the cylinder 6 injector connector and harness for corrosion, damaged pins, broken wires or poor mating. Wiggle test while monitoring live data for changes.
  4. Fuel supply: inspect/replace the primary fuel filter if dirty. Check in-tank strainer and feed hoses for collapse or partial blockage. Verify correct fuel rail pressure at idle and under commanded conditions.
  5. Electrical checks: with ignition off, measure injector coil resistance and compare to spec. Check for short/ground/opens to PCM. Backprobe connector to confirm supply voltage and ground while cranking/operating.
  6. Dynamic checks: use a lab scope or current clamp to observe injector drive waveform and current profile during operation. Look for reduced peak current, slow rise time or irregular pulses that indicate restriction or driver limit.
  7. Flow/contribution test: perform an injector flow/volume test or cylinder balance test. Swap the suspect injector with a known-good injector in another cylinder and see if the problem/code follows the injector.
  8. Cleaning/bench test: if restricted, remove injector and perform a bench flow test and ultrasonic cleaning if applicable. Re-test flow characteristics against replacement limits.
  9. Replace if needed: if the injector remains restricted, internally damaged or fails electrical/dynamic tests, replace the injector and retest. Replace upstream fuel filter/strainer if contaminated.
  10. Verify repair: clear codes and perform road test/operational checks. Confirm no reoccurrence of P02B0 and that cylinder contribution/misfire symptoms are resolved.

Likely causes

  • Carbon or varnish build-up in the injector nozzle from poor fuel or long service intervals
  • Clogged inlet screen or fuel filter upstream of the rail for cylinder 6 feed
  • Restricted fuel return or rail bleeding on that injector port
  • Damaged or corroded connector or wiring increasing electrical resistance and reducing injector opening
  • Injector internal failure (mechanical sticking or partial blockage)

Fault status

⚠️ Status
Stored DTC — Cylinder 6 injector flow restricted. ECM detected reduced injector flow; check engine light may be on and misfire symptoms may be present.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

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Code

P02B0

LAND ROVER P — Powertrain

cylinder balance 6 - restricted injector

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Clogged or partially blocked injector nozzle (deposits, varnish, debris)
  • Restricted fuel supply to the injector (blocked screen, clogged filter, collapsed feed hose)
  • Contaminated fuel (particles, varnish, gelled fuel)
  • Internal injector mechanical failure (stuck pintle/valve, collapsed internal filter)
  • High fuel temperature or low fuel pressure reducing flow
  • Faulty injector driver or PCM command (inconsistent pulse or current limiting)

Symptoms

  • Rough idle and vibration, especially at cold start or idle
  • Check Engine Light illuminated with P02B0 stored
  • Cylinder 6 misfire codes (P0306) or reduced contribution from cylinder 6
  • Loss of power under load or uneven acceleration
  • Increased fuel consumption or smoke (diesel applications)

What to check

  • Read freeze frame and pending counts with a scan tool; confirm P02B0 is stored and note conditions
  • Visual inspection of fuel lines, rail, injector connector and wiring for damage, corrosion or loose connections
  • Check fuel filter condition and fuel supply items (in-tank strainer, feed hoses) for restriction
  • Measure fuel rail pressure and confirm within specification during cranking and operation
  • Perform injector resistance and continuity check and compare to specification
  • Perform a cylinder contribution or balance test to confirm reduced flow from cylinder 6

Signal parameters

  • Injector pulse width / commanded duration from PCM (ms)
  • Injector duty cycle (%) under various loads
  • Injector coil DC resistance (Ω)
  • Injector current draw during opening (A) and peak current behavior
  • Fuel rail pressure (kPa or psi) and stability under load
  • Intake/fuel temperature (°C) if fuel properties affect flow

Diagnostic algorithm

  1. Safety: work in a well-ventilated area, relieve fuel system pressure per manufacturer procedure, wear eye protection and follow shop safety rules.
  2. Verify code: connect a capable scan tool, record freeze-frame and pending codes, then clear codes and re-run to reproduce.
  3. Visual/wiring: inspect the cylinder 6 injector connector and harness for corrosion, damaged pins, broken wires or poor mating. Wiggle test while monitoring live data for changes.
  4. Fuel supply: inspect/replace the primary fuel filter if dirty. Check in-tank strainer and feed hoses for collapse or partial blockage. Verify correct fuel rail pressure at idle and under commanded conditions.
  5. Electrical checks: with ignition off, measure injector coil resistance and compare to spec. Check for short/ground/opens to PCM. Backprobe connector to confirm supply voltage and ground while cranking/operating.
  6. Dynamic checks: use a lab scope or current clamp to observe injector drive waveform and current profile during operation. Look for reduced peak current, slow rise time or irregular pulses that indicate restriction or driver limit.
  7. Flow/contribution test: perform an injector flow/volume test or cylinder balance test. Swap the suspect injector with a known-good injector in another cylinder and see if the problem/code follows the injector.
  8. Cleaning/bench test: if restricted, remove injector and perform a bench flow test and ultrasonic cleaning if applicable. Re-test flow characteristics against replacement limits.
  9. Replace if needed: if the injector remains restricted, internally damaged or fails electrical/dynamic tests, replace the injector and retest. Replace upstream fuel filter/strainer if contaminated.
  10. Verify repair: clear codes and perform road test/operational checks. Confirm no reoccurrence of P02B0 and that cylinder contribution/misfire symptoms are resolved.

Likely causes

  • Carbon or varnish build-up in the injector nozzle from poor fuel or long service intervals
  • Clogged inlet screen or fuel filter upstream of the rail for cylinder 6 feed
  • Restricted fuel return or rail bleeding on that injector port
  • Damaged or corroded connector or wiring increasing electrical resistance and reducing injector opening
  • Injector internal failure (mechanical sticking or partial blockage)

Fault status

⚠️ Status
Stored DTC — Cylinder 6 injector flow restricted. ECM detected reduced injector flow; check engine light may be on and misfire symptoms may be present.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

P0206 P0200 P0306 P0266 P0191
320

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