B2460

Aux Heater Flame Sensor Circuit Short to Ground

Body Engine Cooling Auxiliary heater 🟢 Low — Fix at next service ✅ Safe to Drive
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What This Actually Means

In plain language — no jargon

The auxiliary heater's flame sensor wire is touching ground, creating a short circuit that prevents the heater from working properly. Think of it like a light switch where the wire accidentally touches the metal frame instead of the proper connection point.

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Symptoms You May Notice

3 known symptoms for this code
Auxiliary heater not activating or blowing cold air
Fault code B2460 displayed on dashboard
Engine taking longer to warm up in cold weather
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How Your ECU Detects This

Technical sensor logic and voltage thresholds

The ECU monitors the flame sensor voltage circuit in the auxiliary heater to detect flame presence. When voltage drops to near ground level instead of the expected operating range, the ECU detects a short-to-ground fault and disables the heater for safety. The sensor should maintain a specific voltage signature; any collapse to ground triggers this code.

Voltage & Parameter Thresholds

ParameterNormal RangeFault Condition
Flame sensor voltage 4.5–5.5V <0.5V or shorted to ground
Circuit resistance 1–10kΩ open <100Ω or direct ground contact
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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex
1
Wiring harness inspection
Check for damaged, pinched, or exposed wires on the flame sensor circuit and repair or wrap with electrical tape as needed.
2
Flame sensor connector
Disconnect and reconnect the flame sensor plug firmly to remove corrosion or poor contact causing false ground.
3
Flame sensor assembly
Replace the flame sensor if wiring is intact but voltage still reads at ground.
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When to See a Professional Mechanic

Not all fault codes are safe to DIY

Code B2460 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 B2460

What happens after you fix the fault

Once the fault is repaired, B2460 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.