P2E9A — Charge Port Door B Position Sensor Circuit Low

Causes

• Short to ground in the position sensor signal wire
• Open or high-resistance wiring/connectors between sensor and control module
• Corroded, loose or pushed-back connector at the sensor or module
• Failed charge port door B position sensor (Hall, switch, potentiometer, etc.)
• Loss of sensor reference voltage or ground
• Mechanical binding or misalignment preventing sensor from changing position

Symptoms

• Charge port door may not open or close properly
• Incorrect charge door position indicator or error message on dash/infotainment
• Inability to initiate charging or charging disabled
• DTC stored and possibly a warning light or message
• Intermittent operation of charge door (works sometimes, faults other times)

What to check

• Read freeze frame and live data with a scan tool; note sensor signal values and related data (reference voltage, ground status, door open/closed state).
• Visually inspect charge port door, hinge, and sensor for mechanical damage, binding, debris, or misalignment.
• Inspect harness and connectors at the charge port door and at the control module for corrosion, bent pins, or water intrusion.
• Check fuses and relays related to charge port/control modules if applicable.
• Backprobe the sensor connector with a DVM/oscilloscope to verify signal, reference voltage (usually 5V), and ground.
• Perform wiggle test on harness while monitoring signal for intermittent faults.

Signal parameters

• Typical circuit: 3 wires — 5V reference, signal, ground (varies by manufacturer).
• Expected signal voltage (typical examples): ~0.0–0.5 V = LOW; ~4.5–5.0 V = HIGH for a digital switch-style sensor.
• Some analog position sensors may read ~0.5–4.5 V across travel; check vehicle wiring diagram for exact spec.
• Reference supply should be approximately 5 V (±0.5 V); ground should be near 0 V.
• No short to ground on the signal line; infinite/very high resistance to ground when sensor is open (unless designed low).

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