OBD2 Car ScannerWhat does B2466 mean?
B2466 stands for Aux Heater Overheat Counter Overrun/System Locked. A body control module has found a fault in a comfort or safety system such as airbags, lights, doors, seats or climate control.
Body codes cover the airbags, seats, lights, doors and comfort systems. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.
Common causes
- Damaged wiring or a loose connector (often under seats)
- Faulty switch, sensor or motor
- Low battery voltage
- Faulty body control module
What to do
- Read all stored and pending codes with a scanner. Several codes together often point to one cause.
- Note the freeze frame data (speed, temperature, load) recorded when the code was set.
- Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
- Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.
Read this code from your own car
Plug in a cheap ELM327 adapter and the app shows every fault code, what it means and how to fix it.
Frequently asked questions
What does B2466 mean?
B2466 means “Aux Heater Overheat Counter Overrun/System Locked”. It belongs to the body system group: A body control module has found a fault in a comfort or safety system such as airbags, lights, doors, seats or climate control.
Is it safe to drive with B2466?
You can usually drive carefully for a short time, but fix it soon to avoid further damage or higher fuel use.
How do I clear B2466?
Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.
Related codes
- B2462Aux Heater Flame Out Fault
- B2463Aux Heater Overheat Fault
- B2464Aux Heater Start Time Exceeded
- B2465Aux Heater Start Counter Overrun/System Locked (same as below ?)
- B2467Aux Heater Cool Down Time Exceeded (may be con to a453-5 )
- B2468Aux Heater Coolant Pump Circuit Short to Ground
- B2469Aux Heater Coolant Pump Circuit Open
- B2470Interior Fan Control Circuit Short to Ground
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.