What Does B2460 Mean?
This code indicates the Body Control Module (BCM) has detected a short to ground condition in the auxiliary heater's flame sensor circuit. The flame sensor monitors combustion in diesel-powered auxiliary heaters (common in cold-climate vehicles) to ensure safe operation. The BCM detected abnormally low voltage on the flame sensor signal wire, indicating an unintended electrical path to ground.
Common Causes
45%
Damaged or chafed wiring harness causing the flame sensor signal wire to contact ground or chassis
30%
Failed flame sensor with internal short to ground
15%
Corroded or moisture-contaminated flame sensor connector creating ground path
10%
Faulty auxiliary heater control module with internal circuit failure
Diagnostic Steps
1
Step 1: Perform visual inspection of the auxiliary heater flame sensor and its wiring harness from sensor to BCM, checking for obvious damage, chafing, pinched wires, or signs of heat damage near the heater unit
2
Step 2: Disconnect the flame sensor connector and use a digital multimeter to measure resistance between the sensor signal pin and ground with sensor disconnected (should read open circuit/OL; less than 10k ohms indicates short)
3
Step 3: With sensor still disconnected, measure resistance from the BCM side of the harness signal wire to ground (should read open circuit; continuity indicates wiring harness short to ground)
4
Step 4: Inspect flame sensor connector terminals for corrosion, pushed-back pins, or moisture intrusion; clean with electrical contact cleaner and dielectric grease if contaminated
5
Step 5: If wiring and connector test good, test the flame sensor itself by measuring its resistance per manufacturer specifications (typically 50-200 ohms between sensor terminals when cold)
6
Step 6: Clear codes, reconnect all components, and operate auxiliary heater through a complete heating cycle while monitoring live data for flame sensor voltage (should read 0.5-4.5V during normal operation)
Estimated Repair Cost
$150 - $650
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected a short to ground condition in the auxiliary heater's flame sensor circuit. The flame sensor monitors combustion in diesel-powered auxiliary heaters (common in cold-climate vehicles) to ensure safe operation. The BCM detected abnormally ...
The most common cause of B2460 (Aux Heater Flame Sensor Circuit Short to Ground) is: Damaged or chafed wiring harness causing the flame sensor signal wire to contact ground or chassis
Typical repair costs for B2460 range from $150 to $650, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive, but the auxiliary heater will not function properly and may fail to provide cabin heat or engine pre-warming in cold weather. The heater may be disabled as a safety precaution until the fault is repaired to prevent potential fire hazard from unmonitored combustion.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2460 to identify the root cause.
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Quick Info
Category
Body
System
Auxiliary Heating System
Difficulty
Type
Generic (SAE)
Recommended Tools
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