B2460 — Aux Heater Flame Sensor Circuit Short to Ground

What is the most common cause of B2460?

The most common causes are: body control module (BCM) fault, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.

What are the symptoms of B2460?

Drivers most often notice: warning light on the dashboard, the affected function (locks, windows, lighting, wipers) works intermittently or not at all, no impact on engine operation in most cases.

Will B2460 clear itself?

Sometimes B2460 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How much does it cost to fix B2460?

BCM repair or replacement — $300–$900; Repair wiring or connectors — $80–$250; Replace the switch or actuator — $120–$450. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

What does OBD2 code B2460 mean?

Aux Heater Flame Sensor Circuit Short to Ground (B2460): a body electrical fault affecting the body electrical system. The car is usually drivable while you plan the repair. Most often caused by body control module (BCM) fault, faulty switch, motor or actuator of the affected system, blown fuse or failed relay.

When your scan tool retrieves code B2460, it's flagging a problem in your vehicle's body electrical system — specifically, the auxiliary heater flame sensor circuit has developed a short to ground. This isn't an engine management issue; it's a body/chassis electrical fault under the OBD2 standard. The auxiliary heater uses a flame sensor to confirm the burner is actually igniting. If that sensor circuit shorts to ground, the system can't verify flame presence and will disable heater operation for safety.

The control module won't set B2460 based on a single bad reading. It requires the fault condition to repeat under specific operating parameters before illuminating the warning light. That's why the freeze frame data stored alongside B2460 is valuable — it captures engine load, RPM, coolant temperature, and vehicle speed at the exact moment the problem occurred. Reproducing those conditions during diagnosis gives you the best chance of catching the fault.

Symptoms of B2460

When B2460 is active, you may notice one or more of the following:

• The check engine or warning light stays on the dashboard
• Intermittent or complete loss of affected systems (power locks, windows, interior lighting, wipers)
• The auxiliary heater fails to activate or shuts down unexpectedly
• In most cases, engine performance and drivability remain unaffected

Common Causes of B2460

The most frequent culprits behind code B2460, listed from most to least likely:

• Corroded, damaged, or loose electrical connectors in the flame sensor circuit
• Body control module (BCM) internal failure or software glitch
• Faulty flame sensor, switch, motor, or actuator in the affected subsystem
• Wiring harness damage, especially in door jambs, trunk hinges, or areas exposed to moisture
• Blown fuse or failed relay supplying the auxiliary heater circuit
• Water intrusion causing short circuits in connector housings

How to Diagnose B2460

Follow these steps to pinpoint the cause of B2460 without replacing parts unnecessarily:

1. Connect your OBD2 scanner — Confirm B2460 is stored, note whether it's active or pending, and save all freeze frame data. Record the conditions (load, RPM, temperature, speed) when the fault first appeared.
2. Check for related codes — Secondary codes often point to the root cause. Also search for technical service bulletins (TSB) for your make and model at nhtsa.gov or the manufacturer website using your VIN.
3. Visual inspection — Examine the wiring harness and connectors feeding the auxiliary heater flame sensor. Look for chafing, melted insulation, corrosion, or pins pushed out of position.
4. Operate the system with live data — Watch the relevant switch and actuator PIDs while activating the aux heater or affected function. Unexpected values often reveal the faulty component.
5. Focus on flex points — Inspect wiring at door jambs, tailgate hinges, and anywhere cables move repeatedly. Wires break or rub through insulation at these stress points first.
6. Clear and road-test — After your inspection, erase the code and drive through the exact conditions from your freeze frame. If B2460 returns, the problem is still active.

Repair Options and Costs

Address the simplest, cheapest causes before swapping expensive components:

• BCM repair or replacement: $300–$900 (module + programming labor)
• Wiring harness repair or connector replacement: $80–$250
• Flame sensor, switch, or actuator replacement: $120–$450

Total Repair Cost for B2460

Depending on what actually failed, typical parts-and-labor quotes from an independent shop range from $80 to $900. Most vehicles need only wiring repair or connector service — replacing the entire body control module is the exception, not the rule. Get a confirmed diagnosis before purchasing expensive parts.

Can You Drive with B2460?

Generally safe — body electrical faults like B2460 rarely affect engine operation or transmission function. You can usually continue driving. That said, consider these safety exceptions: a failed exterior lighting circuit leaves you invisible at night or in rain, malfunctioning wipers become hazardous in storms, and a central locking fault could leave your vehicle unsecured. Prioritize fixing B2460 if any of those systems are involved.

Related OBD2 Codes

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• B2402: Audio CD/DJ Thermal Shutdown Fault
• B2403: Audio CD/DJ Internal Fault
• B2404: Audio Steering Wheel Switch Circuit Fault
• B2405: Audio Single-Disc CD Player Thermal Shutdown Fault