B1562

Door Lock Cylinder Circuit Short To Ground

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

In plain language — no jargon

The door lock cylinder circuit is short-circuiting to ground, like a water hose with a hole that drains all the water before it reaches the end. The vehicle's computer detected abnormally low voltage resistance in the door lock wiring.

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Symptoms You May Notice

3 known symptoms for this code
Door locks not functioning or responding to commands
Door lock warning light or message on dashboard
Unable to lock or unlock doors via key fob or interior controls
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the door lock cylinder circuit voltage and resistance during lock/unlock commands. It expects specific voltage levels when power is applied to the solenoid. When a short to ground occurs, voltage drops abnormally low or the circuit draws excessive current, triggering the fault code.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Circuit Voltage 11-14V during lock/unlock pulse <2V or continuous draw indicating short
Circuit Resistance 50-500 ohms nominal load <10 ohms (short to ground detected)
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Door lock wiring harness connector
Inspect connector pins for corrosion, moisture, or loose connections and clean or reseat firmly.
2
Door lock wiring loom
Check for damaged insulation, pinched wires, or exposed copper touching the door frame and repair with electrical tape or replace damaged section.
3
Door lock actuator solenoid
Replace the faulty door lock actuator if wiring checks out clean and connections are secure.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1562 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 B1562

What happens after you fix the fault

Once the fault is repaired, B1562 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.