Safe to drive; climate-comfort fault only. B10AC means the RIGHT blend-door actuator's control (driver) circuit is open — a break in the wiring, the connector, or the actuator itself — so the A/C-Heater control can't move the right temperature door and that side of the cabin is stuck.
What B10AC means
On a dual-zone (ATC) 300C, Charger or Magnum, the A/C-Heater control drives each blend-air door through a two-wire door-driver circuit. B10AC sets when the control sees that circuit as OPEN on the RIGHT actuator — the current path is broken, so the actuator gets no drive and the right temperature door can't move. That side of the cabin stays at whatever temperature the door was last left at. 'Right' is the physical right of the vehicle (the driver's side on a right-hand-drive car).
Symptoms
- The right side of the cabin is stuck at one fixed temperature
- No movement or sound from the right blend-door actuator
- That side does not respond at all to the temperature setting
- B10AC stored in the A/C-Heater module
Common causes
- Open (broken) wire in either of the two right blend-door driver circuits
- Disconnected or corroded connector at the actuator or control module
- Right blend-door actuator with an open internal winding
- Faulty A/C-Heater control (module)
Severity & driving advice
Severity: Low — Comfort fault only — safe to drive; needs a scan tool and, for the circuit test, the wiring diagram.
Can I drive? Safe to drive; climate-comfort fault only.
Diagnostic approach
- Read the HVAC codes — Confirm B10AC on the A/C-Heater module and note any companion codes.
- Inspect and check the actuator connector — Unplug the right blend-door actuator and check the connector for backed-out, corroded, or spread terminals. Reseat and retest.
- Test the two driver wires for an open — Using the wiring diagram, check continuity of both door-driver circuits between the A/C-Heater control connector and the actuator connector. Repair any open.
- Replace the actuator, then the control if needed — If the wiring and connectors are good, replace the right blend-door actuator and calibrate. If B10AC persists, suspect the A/C-Heater control module.
Estimated repair costs
Typical US repair costs (parts & labour) for the faults behind B10AC. 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) |
|---|---|
| Wiring / connector repair | $80–$260 |
| Blend-door actuator (part) | $15–$90 |
| Actuator replacement + calibration (shop) | $90–$250 |
| A/C-Heater control module | $200–$600 |
Make & model notes
Chrysler / Dodge / Jeep: B10AC is the dual-zone (ATC) RIGHT blend-door 'control circuit open' code on LX-platform cars (300 / 300C, Charger, Magnum) and related FCA models. Unlike the travel codes, this one points at the wiring path first — check the actuator connector and the two door-driver wires before replacing the actuator. Refer to the factory wiring diagram (Section 8W) for the circuit, and calibrate after any actuator or control-head change.
FAQ
What is the difference between B10AC and B10AE?
B10AC is an electrical fault — the right actuator's control circuit is open, so the door gets no drive. B10AE is a mechanical/calibration fault — the door moves but over-travels. B10AC is diagnosed at the wiring and connector; B10AE at the door and actuator.
Can a bad connector cause B10AC?
Yes — a backed-out or corroded terminal at the actuator or control module is a common cause of a 'circuit open' code. Always inspect and reseat the connector before condemning the actuator.
Is B10AC safe to drive with?
Yes — it only affects climate comfort on the right side of the cabin.