B1339

Chime Input Request Circuit Short To Battery

Body Chassis/Safety Body Control Electronics 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

The chime/bell system in your car is receiving too much electrical power, like a wire touching the positive battery terminal instead of being properly grounded. The body control module detected this abnormal voltage spike on the chime circuit.

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Symptoms You May Notice

3 known symptoms for this code
Chime sounds constantly or at inappropriate times
No chime sound when doors open or seat belts unbuckle
Dashboard warning lights may flicker or behave erratically
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The body control module monitors the voltage on the chime request signal circuit, expecting it to toggle between ground (0V) and a low control voltage (typically 5V or 12V depending on design). When the circuit shorts directly to battery voltage (12V+), the module detects an overvoltage condition that exceeds safe operating thresholds.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Chime Input Voltage 0V to 5V (or 0V to control voltage) Sustained 12V+ or battery voltage
Signal Transition Time Normal digital switching pattern Stuck high or unable to transition to ground
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Chime wiring harness
Inspect the chime input wire for damage, pinches, or insulation breaks that expose bare conductor to nearby battery positive terminals.
2
Chime module connector
Disconnect and reseat the chime module connector firmly, cleaning any corrosion from the pins with a dry cloth.
3
Chime module
If wiring is intact, replace the chime module as it may have internal short-to-battery damage.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B1339 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 B1339

What happens after you fix the fault

Once the fault is repaired, B1339 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.