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Home / DTC / P20D2 — Exhaust Aftertreatment Fuel Injector B Control Performance

P20D2 — Exhaust Aftertreatment Fuel Injector B Control Performance

Detailed page for trouble code P20D2.

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P20D2

Generic P — Powertrain

Exhaust Aftertreatment Fuel Injector B Control Performance

Brand: Generic
Type: P — Powertrain
Views: UK: 13 EN: 16 RU: 15
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Page language: EN

Causes

  • Open or short in injector B wiring (power, ground, or control)
  • Poor connector or corrosion at injector/ECM harness
  • Failed exhaust aftertreatment fuel injector B (stuck, clogged, or electrically open/shorted)
  • Faulty ECM injector driver or internal control module fault
  • Insufficient fuel supply to the injector (blocked line, failed pump or filter)
  • Software issue or missing ECM calibration/parameter

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Failed or incomplete DPF/SCR regeneration events
  • Aftertreatment system fault warnings or reduced system functionality
  • Increased soot accumulation, higher exhaust emissions, or limp-home modes
  • Possible abnormal engine run during forced regen attempts (roughness or smoke)

What to check

  • Read and record all stored DTCs, freeze-frame data and pending codes
  • Check for Technical Service Bulletins (TSBs) or calibration updates for this code
  • Visually inspect injector B connector, wiring harness and route for damage or heat exposure
  • Check fuses and relays for aftertreatment fuel injector circuits
  • Measure supply voltage to the injector connector with ignition on
  • Measure injector coil resistance and compare to specification

Signal parameters

  • Typical control: low-side driver (switch to ground) with PWM duty control; check service manual for exact topology
  • Expected command: 0–100% duty cycle depending on dosing requirements (ECM commanded)
  • Nominal control voltage at connector: battery voltage (~12 V) on supply pin with ignition on
  • Ground continuity: near 0 ohms between injector ground pin and vehicle chassis ground
  • Injector coil resistance: compare to manufacturer spec (common range often tens to hundreds of ohms — check service data)
  • PWM frequency: varies by vehicle (commonly tens to hundreds of Hz); verify with oscilloscope against OEM spec

Diagnostic algorithm

  1. Connect a compliant scan tool. Read and save DTCs, freeze frame and readiness status. Note operating conditions when fault set.
  2. Check for available ECM software updates or TSBs that address injector control faults.
  3. Perform a visual inspection of harness and connectors for injector B. Repair any damaged wiring, bent pins or corrosion.
  4. Verify power and ground presence at the injector connector with ignition ON. Repair fuses/relays or supply circuit faults.
  5. Measure injector coil resistance (engine off, connector disconnected). Compare to service specification. Replace if out of tolerance.
  6. Backprobe the control and supply pins. Command the injector on with a capable scan tool and observe voltage/duty. Confirm expected response.
  7. Use an oscilloscope to check the control waveform while the injector is commanded. Look for proper PWM shape, amplitude, and no excessive noise or shorted waveform.
  8. Check continuity between injector pins and ECM pins to rule out intermittent opens or shorts (wiggle test while monitoring).
  9. If wiring and injector check OK, perform an ECM driver test if supported. If driver output is absent or abnormal while command present, suspect ECM fault.
  10. If available, swap with a known-good injector (or swap driver outputs per OEM guidance) to isolate injector vs ECM. Replace the faulty component.
  11. After repair, clear codes and perform forced regeneration or drive cycle to confirm fault does not return.

Likely causes

  • Damaged insulation or chafed wire causing intermittent short to ground or battery
  • Connector pins pushed out, bent, corroded, or contaminated
  • Injector solenoid coil out of specified resistance range or intermittent
  • ECM output transistor (low-side driver) failed
  • Plugged injector nozzle preventing proper spray and altering electrical load
  • Fuse or relay for injector power circuit open or intermittent

Fault status

⚠️ Status
Exhaust Aftertreatment Fuel Injector B control performance fault — ECM detected out-of-range response or improper signal from the injector control circuit.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

P20D0 P20D1 P20D3 P20D4 P20D5
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