B0418 on Cadillac
Right Temperature Control Circuit (HVAC actuator circuit)
B0418 on Cadillac vehicles indicates right temperature control circuit (hvac actuator circuit). Au7o has documented this code across 1 Cadillac model — most commonly on XTS. Body/climate-control code, seen most often on GM vehicles (Chevrolet, Cadillac, GMC) and also used in Saab automatic climate control diagnostics. It reports a fault in the circuit for the right-side (passenger) temperature control actuator — the blend door motor that mixes hot and cold air for that side of the cabin. Sub-codes narrow the failure mode: B0418:01 short to battery, B0418:02 short to ground, B0418:04 open circuit. Typical symptoms are a passenger side stuck hot or cold, no independent dual-zone control, or a clicking noise behind the dash. It is a comfort fault, not a safety or driveability one. Typical repair costs on Cadillac range from $120 to $450, depending on the specific model and root cause.
Common Causes of B0418
- •Failed right/passenger temperature blend door actuator motor
- •Broken or jammed blend door or stripped actuator gears
- •Open, shorted, or chafed wiring in the actuator circuit
- •Corroded or loose actuator connector
- •HVAC control module (or body control module) fault
- •Blown fuse feeding the HVAC actuator circuit
B0418 on Cadillac by Model
Cadillac XTS(1 issue)
- HVAC Blend Door Actuator Clicking / Blower Resistor No Heat2013-2019
Two related HVAC complaints are common on the XTS: a repetitive clicking/knocking from behind the dash caused by a failing blend-door (temperature) actuator that can't reach its calibration stop, and loss of fan-speed control or no heat from a failed blower motor resistor/module — when the resistor fails the fan often works only on the highest setting. Owners report inconsistent temperature (one side hot/one cold) with the actuator fault and a dead or single-speed blower with the resistor fault.
Looking for B0418 on a different make?
View B0418 across all makes →Frequently Asked Questions
What does B0418 mean on Cadillac?▼
B0418 stands for "Right Temperature Control Circuit (HVAC actuator circuit)." Body/climate-control code, seen most often on GM vehicles (Chevrolet, Cadillac, GMC) and also used in Saab automatic climate control diagnostics. It reports a fault in the circuit for the right-side (passenger) temperature control actuator — the blend door motor that mixes hot and cold air for that side of the cabin. Sub-codes narrow the failure mode: B0418:01 short to battery, B0418:02 short to ground, B0418:04 open circuit. Typical symptoms are a passenger side stuck hot or cold, no independent dual-zone control, or a clicking noise behind the dash. It is a comfort fault, not a safety or driveability one. On Cadillac specifically, this code is documented across 1 model.
What causes B0418 on Cadillac vehicles?▼
Common causes on Cadillac: Failed right/passenger temperature blend door actuator motor, Broken or jammed blend door or stripped actuator gears, Open, shorted, or chafed wiring in the actuator circuit, Corroded or loose actuator connector, HVAC control module (or body control module) fault. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix B0418 on a Cadillac?▼
Repair costs on Cadillac range from $120 to $450, depending on the specific model and root cause.
Which Cadillac models have B0418 documented?▼
Au7o has documented B0418 on 1 Cadillac model: XTS.