OBD2 Car ScannerWhat does B2429 mean?
B2429 stands for A/C Post Heater Sensor #2 Circuit Short to Ground. 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 B2429 mean?
B2429 means “A/C Post Heater Sensor #2 Circuit Short to Ground”. 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 B2429?
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 B2429?
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
- B2425Remote Keyless Entry Out of Synchronization
- B2426Passenger Solar Radiation Sensor Circuit Open
- B2427Passenger Solar Radiation Sensor Circuit Short to Ground
- B2428A/C Post Heater Sensor #2 Circuit Failure
- B2431Transponder Programming Failed
- B2432Drivers Seat Belt Buckle Switch Circuit Open
- B2433Drivers Seat Belt Buckle Switch Circuit Short to Battery
- B2434Drivers Seat Belt Buckle Switch 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.