P02B7 - Cylinder 4 Injector - Restrictive Flow/Control Circuit High
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System
Powertrain (Engine & Gearbox)
Related Fault Codes
Technical Description
P02B7 is an OBD-II diagnostic trouble code indicating that the Engine Control Module (ECM) has detected a 'high' condition in the fuel injector control circuit for cylinder 4. This typically means the circuit voltage stays above a specific threshold when it is expected to be low, often due to a short to voltage (B+) in the wiring or an internal injector short. The ECM monitors the duty cycle and current flow; if the feedback signal deviates from the mapped parameters (e.g., peak-and-hold current levels), the MIL is illuminated and limp-home mode may be activated.
Possible Causes
Short to voltage in the wiring harness for injector 4
Faulty fuel injector (internal electrical short)
Corroded or loose terminal connectors
Internal Engine Control Module (ECM) failure
Symptoms
Recommended Solution
Workflow
Mechanic's Tip
Before replacing expensive components, always double-check wiring and connections. 80% of all sensor faults are actually due to corroded contacts or broken wires.
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