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DTC codes / P02xx · Fuel and air metering (injector circuits) / P02EE

P02EECylinder 1 Injector Circuit Range/Performance

P02EE indicates that the engine control module (ECM) has detected an abnormal condition in the electrical circuit for cylinder 1's fuel injector, where the circuit's performance falls outside the expected range for voltage or current. The ECM monitors the injector driver and compares the actual electrical response to the commanded pulse, flagging the code when the circuit behaves erratically or fails to meet specifications.

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
  • Rough idle or misfire felt as a shake or stumble, especially when the engine is cold
  • Reduced engine power and poor acceleration due to a dead or weak cylinder
  • Increased fuel consumption as the ECM may default to a rich condition
  • Possible smell of raw fuel from the exhaust if the injector is stuck open
  • Intermittent operation where the engine runs fine one moment and misfires the next

Common causes, most likely first

  1. Faulty fuel injector for cylinder 1 (coil winding open or shorted, or mechanically clogged)
  2. Damaged or corroded electrical connector at the injector
  3. Chafed, broken, or shorted wire in the injector harness
  4. Loose or corroded ground connection for the injector circuit
  5. Failed injector driver inside the ECM (less common but possible)
  6. Contamination in the fuel system causing the injector to stick or perform poorly

How to diagnose and fix it

  1. Perform a visual inspection of the cylinder 1 injector connector and wiring for damage or corrosion
  2. Use a noid light or oscilloscope to check for a proper pulse signal at the injector connector
  3. Measure the injector coil resistance with a multimeter and compare to the manufacturer's specification
  4. Check for continuity and shorts in the injector circuit between the ECM and the injector
  5. Test fuel pressure and inspect for contaminated fuel if the injector is mechanically suspect
  6. Swap the cylinder 1 injector with another cylinder to see if the misfire follows the injector
  7. If all electrical checks pass, diagnose the ECM driver circuit or replace the ECM as a last resort

What the injector circuit code really means

  • A P02EE code often sets intermittently due to a poor connection at the injector pigtail, so wiggle-testing the harness while the engine runs can reveal the fault.
  • The ECM may set this code even when the injector is mechanically clogged, because the resulting change in current draw can fall outside the expected range.
  • Do not overlook a weak battery or charging system, as low voltage can cause injector drivers to misreport circuit performance and set false codes.
  • A stuck-open injector can hydrolock the engine and dilute the oil with fuel, so address a rich-running symptom promptly.
  • After repairs, the ECM may require a relearn or several drive cycles before the code clears permanently.

Can I keep driving with P02EE?

Driving with P02EE is generally safe for short distances, but avoid heavy acceleration or towing because a misfiring cylinder can overheat the catalytic converter and cause costly damage. If the engine runs very rough or you smell raw fuel, stop driving and have the vehicle towed to prevent further damage.

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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