P02A0

Code

Generic P — Powertrain

Cylinder 2 - Injector Restricted

Brand: Generic

Type: P — Powertrain

Views: UK: 26 EN: 70 RU: 38

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Page language: EN

Causes

Clogged or partially blocked injector nozzle or inlet screen
Contaminated fuel (debris, varnish, water, or particulates)
Collapsed or restricted fuel supply line or rail feed to cylinder 2
Faulty injector (sticking pintle, internal leakage, failed solenoid)
Low fuel pressure or weak fuel pump reducing flow
Wiring harness damage, poor connector, or corroded pins at injector

Symptoms

Rough idle or vibration, often localized to cylinder 2
Misfire on cylinder 2 (may set P0302 as well)
Loss of power or poor acceleration under load
Increased fuel consumption or stumble on throttle
Hard starting or extended cranking
Black smoke (diesel) or rich/uneven exhaust if flow is inconsistent

What to check

Read freeze-frame and live PID data with a scan tool to confirm conditions when the fault set (RPM, load, fuel pressure, temp).
Check for additional codes (misfires, low fuel pressure, injector circuit codes) to narrow cause.
Visually inspect injector connector, wiring harness and pins for corrosion, damage or poor connection.
Confirm fuel pressure and rail flow are within manufacturer specification with engine cranking and running.
Inspect and replace fuel filter if restricted; check inlet screens and any supply restrictors.
Swap cylinder 2 injector with another cylinder and see if the code or misfire follows the injector.

Signal parameters

Injector coil resistance (Ω) — compare to manufacturer specification
Injector activation current (A) during pulse — waveform shows expected current ramp
Injector pulse width (ms) at given RPM and load (from scan tool)
Fuel rail pressure (psi or bar) at idle, during cranking and under load
Fuel flow rate or injector volume (cc/min) during bench or on-engine flow test
Short-term and long-term fuel trim (%) for bank/cylinder comparisons

Diagnostic algorithm

Retrieve codes and freeze-frame data. Note engine conditions (RPM, load, temp, fuel pressure) when P02A0 set.
Perform a visual inspection of the injector harness and connector for damage, corrosion or loose pins. Repair any wiring faults.
Verify proper fuel pressure and supply flow. Replace fuel filter if clogged and inspect rail feed lines and inlet screens.
Check injector electrical integrity: measure coil resistance and compare to spec; check for short to ground or open circuit.
Use a noid light or oscilloscope to confirm the PCM is commanding the injector on cylinder 2 (pulse width and frequency). If no command, investigate PCM/injector driver and wiring.
Swap the suspect injector with a known-good injector from another cylinder. Erase codes and run engine. If the fault follows the injector, focus on the injector; if it stays on cylinder 2, focus on wiring/PCM.
If electrically commanded but flow is low, perform an on-vehicle injector flow test or remove the injector for bench flow testing/inspection and cleaning.
Inspect removed injector for clogged nozzle, varnish, or physical damage. Clean (ultrasonic or professional cleaning) and retest, or replace if cleaning fails or if internal failure is present.
After repair or replacement, clear codes and run the engine across operating conditions to confirm the fault does not return and that fuel trims/misfire counts are normal.
If wiring and injector check good but restriction is present, inspect fuel rail restrictors, delivery metering components, or replace PCM only after confirming driver failure with manufacturer-guided tests.