Safe to drive; this is a climate-comfort fault, not a safety issue. B10AE means the A/C-Heater control measured too much travel on the right blend-door actuator during calibration — the right-side temperature door over-travels or the actuator turns without hitting a firm stop, so that side of the cabin usually ends up stuck hot (or stuck cold).
What B10AE means
On a 300C, Charger or Magnum with dual-zone automatic climate control (ATC), each side of the cabin has its own blend-air (temperature) door, and each door is moved by its own 12-volt actuator that the A/C-Heater control commands. The control 'calibrates' each actuator by driving the door to one soft stop and counting the pulses it takes to reach the other stop, learning the door's total travel span. B10AE sets when the right door's measured span is LARGER than the expected range — the door is over-travelling, a physical stop is missing, or the actuator is slipping on a worn cam. With the door no longer positioned accurately, the right side of the cabin typically blows one fixed temperature (most often full hot) regardless of the setting. Note that 'right' is the physical right of the vehicle: on a left-hand-drive car that is the passenger side, and on a right-hand-drive car it is the driver's side.
Symptoms
- The right side of the cabin blows hot (or cold) no matter what temperature you select
- Only one side is affected — the other side still heats and cools normally
- No change on that side when you move the temperature dial
- B10AE stored in the A/C-Heater (HVAC) module, sometimes with B10AF
Common causes
- Worn, broken, or missing right blend-air door, cam, linkage, or door stop that lets the door over-travel
- Warped or cracked A/C-Heater housing so the door's stops are no longer in the right place
- Right blend-door actuator slipping on its splines or failing internally
- Faulty A/C-Heater control (module) — confirmed only after the door and actuator check out
Severity & driving advice
Severity: Low — Comfort fault only — the vehicle is safe to drive. Diagnosis needs a scan tool that communicates with the A/C-Heater module.
Can I drive? Safe to drive; this is a climate-comfort fault, not a safety issue.
Diagnostic approach
- Read the HVAC module codes first — Use a scan tool that can talk to the A/C-Heater module. Diagnose and repair any active Control Circuit / Performance or Control Circuit Open codes before chasing B10AE.
- Inspect the right blend door and housing — Check for worn, disconnected, missing, or broken door linkage, a warped or broken housing, and missing door seals. Rotate the door stop-to-stop — it should sweep roughly 190 degrees. Repair any mechanical fault found.
- If the door is mechanically fine, replace the right blend-door actuator — The actuator is a bolt-on part on the right end of the heater housing (behind the lower-dash trim). Fit the new one, aligning its output-shaft splines to the door cam.
- Run the Actuator Calibration Test and re-check — Scan tool → System Tests → Actuator Calibration Test. If B10AE still sets after calibration, the A/C-Heater control module is the fault; if it clears, the repair is done.
Estimated repair costs
Typical US repair costs (parts & labour) for the faults behind B10AE. These are national-average estimates, not a quote— your actual price varies by region, shop labour rate, and your vehicle’s make, model and year. Figures reviewed 2026.
| Repair | Estimated cost (USD) |
|---|---|
| Blend-door actuator (part) | $15–$90 |
| Actuator replacement + calibration (shop) | $90–$250 |
| Blend door / housing repair (dash out) | $400–$1,100 |
| A/C-Heater control module | $200–$600 |
| Professional HVAC diagnosis | $90–$160 |
Make & model notes
Chrysler / Dodge / Jeep: B10AE is the dual-zone (ATC) RIGHT blend-door 'travel too large' code on LX-platform cars (300 / 300C, Charger, Magnum) and related FCA models. It is a very common cause of the classic 'one side of the cabin is always hot while the other is cold' complaint. 'Right' is the physical right side, so on a right-hand-drive car it is the driver's side. The blend-door actuator is a three-screw, one-connector bolt-on behind the lower-dash trim (driver's-side knee panel); torque the screws to 2 N·m (17 in-lb) and always run the scan-tool Actuator Calibration Test after replacing the actuator or the control head.
Manufacturer-specific code: B10AE is a B1xxx code, which is manufacturer-defined rather than a standard SAE code — on a different make the same number can mean a completely different fault, with different symptoms, diagnosis and repair. This page covers the FCA / Chrysler-Dodge-Jeep meaning and its diagnosis; if you are not on an FCA vehicle, confirm the code and its procedure against your own manufacturer's information.
FAQ
Can I drive with a B10AE code?
Yes. It only affects climate comfort on one side of the cabin — it is not a safety or drivetrain fault. It is worth fixing because that side will be stuck at one temperature.
Will running the actuator calibration fix B10AE?
Sometimes. If the door and linkage are mechanically sound, re-running the A/C-Heater Actuator Calibration Test can let the door re-learn its stops and clear the code. If a stop, cam, or door is worn or broken, the code will return and the actuator (or occasionally the door) needs replacing.
Which side is the 'right' blend door on a right-hand-drive car?
'Right' means the physical right of the vehicle, so on a right-hand-drive 300C it is the driver's side. On a left-hand-drive car the right blend door is the passenger side.
What is the difference between B10AE and B10AF?
B10AE (travel too large) is set during calibration when the right door's measured travel span is out of range. B10AF (actuator performance) is set during normal operation when the control sees a pulse-count error while driving the right actuator. They often appear together and share the same repair path.