P02EE: Cylinder 1 Injector Circuit Range/Performance
May cause rough idle, misfire, reduced engine power, and decreased fuel economy
Overview
OBD-II Diagnostic Trouble Code P02EE indicates an out-of-range or performance issue in the fuel injector circuit for cylinder 1, likely caused by injector electrical faults, wiring issues, or injector malfunction
Common Symptoms
- Check Engine Light illuminated
- Engine runs rough at idle
- Reduced engine power or acceleration
- Decreased fuel economy
- Possible misfiring or hesitation
Most Common Causes
Injector may be clogged or internally failed, leading to incorrect fuel delivery
Open, shorted, or corroded wiring/connector can prevent proper injector operation
Rare but possible — injector control transistor in PCM may fail
Fuel pump or pressure problems can indirectly affect injector performance
Diagnostic Steps
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Retrieve and confirm P02EE with an OBD-II scan tool and check for related codesExpected: Code P02EE present; note any additional cylinder injector or fuel system codesInterpretation: Confirms initial fault and checks for cascading issues
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Visually inspect cylinder 1 injector wiring and connectorExpected: No broken wires or corrosion; secure connectionsInterpretation: Connector/wiring issues are a common cause if defects are found
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Measure injector resistance with a multimeter and compare to OEM specExpected: Resistance within manufacturer’s specified rangeInterpretation: Out-of-range reading suggests a faulty injector
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Check for voltage and ground at injector connector with key onExpected: Steady voltage and pulsed ground from PCM during crankingInterpretation: Lack of proper power/ground indicates wiring/PCM driver issue
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Perform a noid light or oscilloscope test on injector pulseExpected: Regular pulse signal from PCMInterpretation: Irregular or absent signal suggests a PCM or wiring fault
Repair Solutions
Cost varies by vehicle make/model and whether OEM or reman part is used
Includes labor for tracing and fixing harness issues
Rare; confirmed only after ruling out other faults
Common Misdiagnoses
Avoid these common diagnostic mistakes:
- Assuming a bad fuel pump or filter is primary cause without checking injector circuit
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