P2E9B

Code

Generic P — Powertrain

Charge Port Door B Position Sensor Circuit High

Brand: Generic

Type: P — Powertrain

Views: UK: 18 EN: 28 RU: 16

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Page language: EN

Causes

Open circuit in the position sensor signal wire (broken wire, disconnected connector)
Short to battery/ignition voltage on the signal wire
Corroded or damaged connector/terminal at the sensor or module
Faulty charge-port door B position sensor or integrated switch
Poor or missing ground at sensor or module
Body/BCM/module internal fault or incorrect programming

Symptoms

Malfunction indicator or EV/charging warning lamp related to charge port or charging system
Charge port door may not open or close automatically, or shows incorrect open/closed state
Vehicle may refuse to start charging or shows charging error message
Stored or pending DTC P2E9B (may reappear after clearing)
Intermittent operation of door latch or position indicator

What to check

Read freeze-frame and live data with a capable scan tool and confirm P2E9B is current or stored
Visually inspect charge port door, hinge area, sensor connector and wiring for damage, corrosion, pin push-out, or water intrusion
Check for service bulletins or recent software updates for BCM/door module
Inspect fuses and related power/ground circuits for the BCM/door module
With connector disconnected, check for short to voltage on the sensor signal pin (using appropriate backprobe technique)
Measure continuity between sensor ground pin and chassis ground

Signal parameters

Typical position-sensor signal: 0–5 Vdc range (varies by manufacturer). A ‘high’ fault often measures near reference/supply voltage (≈4.5–12 V depending on design) when circuit is open or tied to supply
Expected change when door moves: signal should switch between two defined levels (open vs closed) or sweep across a range if potentiometer-style sensor
If circuit is open, DVM may show near-supply or floating voltage; an oscilloscope will show a stable high with a true short-to-voltage
Resistance to ground on sensor signal pin (connector disconnected) should be high (open) unless it is a switch—refer to OEM spec

Diagnostic algorithm

Verify the code: connect scan tool, record freeze frame and live data for charge-port door B position while commanding or manually moving the door. Confirm the signal is reading high compared to expected levels.
Visual inspection: inspect harness, connector and sensor at the charge port door for damage, corrosion, water, or pin push-out. Check connector seals and hinge routing.
Check power and ground: with key on, measure reference power and ground at the sensor connector. Verify proper ground continuity to chassis and correct supply voltages. Repair any open ground or supply issues.
Backprobe signal: backprobe the signal wire and observe voltage with door open/closed. If the signal is stuck high (near supply/reference), suspect open or short-to-voltage. If it toggles correctly, suspect intermittent or module issue.
Continuity and short test: with battery disconnected, measure continuity between the sensor signal wire and battery positive — a short indicates wiring short to voltage. Check for continuity to BCM input pin. Repair any damaged wiring.
Wiggle test and inspect while operating door: move harness and actuator through full travel while watching live data for intermittent changes. Repair chafing or broken conductors.
Isolate sensor: disconnect the sensor; check for pull-up voltage on the harness (if present). Replace sensor if wiring/connector are good but sensor signal still abnormal.
If wiring and sensor check good, test or reflash BCM/door module per OEM procedures or substitute known-good module if available. After repairs, clear codes and verify operation through multiple open/close cycles and a charging attempt.
Final verification: clear DTC, perform function tests, roadtest/operate charge door multiple times and re-scan to ensure code does not return.

Likely causes

Broken or pulled signal wire between charge port door sensor and body control module (BCM)
Connector corrosion or water intrusion at charge port door harness
Sensor internal failure (stuck/shorted to supply)
Blown/loose ground for sensor circuit
Intermittent wiring fault caused by hinge movement