Code
B2861
MITSUBISHI
B — Body
PWR.striker hall SNS:SHT to BAT
Views:
UK: 15
EN: 18
RU: 12
AI status
Completed
Completed
100%
Causes
- Damaged or pinched wiring harness allowing the signal wire to contact battery feed (B+)
- Corroded or pushed-back connector pins creating unintended contact with a B+ circuit
- Failed Hall-effect striker sensor with internal short to battery
- Water ingress or corrosion at sensor or connector causing shorts
- Poor repair or aftermarket accessory tied into B+ near the sensor circuit
- Control module input fault (rare)
Symptoms
- DTC B2861 stored (may be accompanied by other body/door DTCs)
- Power door, sliding door, or tailgate may not operate or behave intermittently
- Door-open/close sensors not reporting correctly to BCM/ECU
- Possible interior warning chime or indicator related to door function
- System may default to manual operation or lockout until fault cleared
What to check
- Read stored DTCs and freeze-frame data with a scan tool; check for related codes
- Visually inspect connector at the striker/Hall sensor for water, corrosion, bent pins, or pushed-back terminals
- Inspect wiring along the door/striker harness route for damage, chafing, or repairs
- With ignition ON, backprobe the sensor signal pin and check voltage relative to ground
- Check for B+ present on the signal line with ignition ON and OFF (should not be constant B+)
- Disconnect the sensor connector and observe if the DTC clears or signal voltage disappears
Signal parameters
- Typical Hall sensor supply: 5 V reference (varies by model; verify factory spec)
- Signal output: switching or varying 0–5 V (or open-collector pulldown) depending on sensor; with valid operation, signal should not be steady at battery voltage
- Short-to-battery symptom: sensor signal pin measures battery voltage (~12 V) or close to it when it should be a low-voltage sensor signal
- When sensor disconnected, continuity between signal wire and battery positive should be infinite; low resistance indicates short
Diagnostic algorithm
- Connect a diagnostic scan tool, read and record fault codes and freeze frame. Note whether code is current or historic.
- Visually inspect sensor and harness at the striker for damage, corrosion, or water ingress. Repair obvious damage as needed.
- With ignition OFF, unplug the sensor connector. Inspect pins for evidence of contact with B+ terminal or foreign material.
- Turn ignition ON (engine off). Backprobe the sensor connector signal terminal. Measure voltage to ground: if ~12 V, a short to battery exists.
- With sensor disconnected, measure resistance between the signal wire and battery positive. Low resistance indicates a wiring short — isolate wiring sections by disconnecting intermediate connectors until short clears.
- If no short at wiring harness, reconnect sensor and measure signal while operating door/striker. If signal remains at battery voltage only when sensor is connected, suspect failed sensor and replace.
- After repair or sensor replacement, clear codes and cycle door operation several times while monitoring for reappearance of B2861 and verifying correct signal behavior.
- If fault persists after sensor and wiring verified good, inspect BCM/input module grounds and power feeds; consider module fault and consult manufacturer service information before replacing control module.
Likely causes
- Frayed signal wire rubbed through and touching a B+ conductor or body-mounted power feed
- Connector terminal displaced so sensor signal pin contacts a B+ terminal in the harness plug
- Striker/Hall sensor failed internally and applies battery voltage to the signal output
- Moisture-corroded connector causing high-resistance short to battery
Fault status
Status
Power striker (Hall) sensor signal circuit is shorted to battery voltage (B+). Control module detects battery voltage on the sensor signal input and sets DTC B2861.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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