B0339
Rear Seat Heater Circuit
The body control module has detected a fault in the rear seat heater circuit. The rear heating elements are open or shorted.
The body control module has detected a fault in the rear seat heater circuit. The rear heating elements are open or shorted.
Common causes
- high
Heater element broken
One of the most commonly reported causes for this code — check this first.
Typical part cost: $170-880
- medium
Wiring open under seat
A plausible cause — test and verify before replacing parts.
Typical part cost: $170-880
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for B0339.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for B0339.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for B0339.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does B0339 mean?
B0339 means "Rear Seat Heater Circuit". It is a generic OBD-II code that points to a fault in the body.
What are the most common causes of B0339?
heater element broken; wiring open under seat — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full B0339 diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.