B1495

Decklid Punch-Out Sensor Circuit Failure

Body Chassis/Safety Door/Latch Sensors 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

Your car's trunk lid has a sensor that detects when it's fully closed, and that sensor isn't communicating properly with the computer. It's like a light switch that's broken or disconnected—the car can't tell if the trunk is really shut.

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Symptoms You May Notice

3 known symptoms for this code
Trunk lid warning light illuminated on dashboard
Trunk latch may not fully engage or disengage
Inability to lock/unlock trunk remotely via key fob
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the decklid punch-out sensor's signal voltage when the trunk is opened and closed. The sensor should toggle between high and low voltage states at specific points. If the signal is missing, stuck, or out of range, the ECU logs a circuit failure.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Sensor Signal Voltage 0V (open) to 5V (closed) with clear state transition No signal, stuck voltage, or erratic transitions
Circuit Resistance Below 50 ohms when closed Above 100 ohms or open circuit (infinite resistance)
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Decklid latch assembly
Inspect the latch for debris or corrosion, clean contacts with electronics cleaner, and test sensor operation by opening/closing trunk.
2
Wiring harness connector at trunk lid
Check for loose, corroded, or disconnected connectors; reseat firmly and inspect for water intrusion.
3
Decklid punch-out sensor
If wiring is intact, replace the faulty sensor switch located in the trunk latch mechanism.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1495 is a low-severity fault. Your vehicle is generally safe to drive to a workshop for diagnosis. However, do not ignore it indefinitely — low-severity codes often indicate developing problems that become expensive if neglected. Book a diagnostic appointment within 2–4 weeks. If you notice any additional symptoms (rough running, power loss, unusual smells), treat it as higher priority.

Safety note: OBD-II codes identify the system or circuit where a fault was detected — they do not always identify the exact failed component. A professional mechanic using live sensor data will diagnose the root cause more accurately than replacing parts based on the code alone.
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How to Clear Code B1495

What happens after you fix the fault

Once the fault is repaired, B1495 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.

The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.

✅ Safe to Clear When
  • Fault has been diagnosed and repaired
  • You want to confirm the repair worked
  • Code appeared after a sensor was cleaned
⚠️ Do Not Clear When
  • Preparing for an emissions/PUC test
  • Root cause is still undiagnosed
  • Check engine light is flashing
Emissions test note: Clearing codes resets OBD readiness monitors. Most vehicles need 50–100 km of mixed driving before monitors complete. Do not clear codes immediately before an emissions or PUC inspection.