AIR CONDITIONING SYSTEM DIAGNOSTIC TROUBLE CODES (DTC) LIST

DTC	Description
DTC B1204	Air Mix Potentiometer Open (Low)-Passenger
DTC B1205	Air Mix Potentiometer Short (High)-Passenger
DTC B1208	Intake Potentiometer Open (Low)
DTC B1209	Intake Potentiometer Short (High)
DTC B1233	In-Car Temperature Sensor Short (Low)
DTC B1234	In-Car Temperature Sensor Open (High)
DTC B1237	Ambient Temperature Sensor Short (Low)
DTC B1238	Ambient Temperature Sensor Open (High)
DTC B1241	Evaporator Sensor Short (Low)
DTC B1242	Evaporator Sensor Open (High)
DTC B1245	Air Mix Potentiometer Open (Low)-Driver
DTC B1246	Air Mix Potentiometer Short (High)-Driver
DTC B1249	Direction Potentiometer Open (Low)-Driver
DTC B1250	Direction Potentiometer Short (High)-Driver
DTC B1281	Humidity Sensor Short (Low)-AUTO Defog
DTC B1282	Humidity Sensor Open (High) - AUTO Defog
DTC B1283	Direction Potentiometer Open (Low) - AUTO Defog
DTC B1284	Direction Potentiometer Short (High) - Auto Defog
DTC B1285	Direction Control Motor -AUTO Defog
DTC B1672	APT Sensor Fault-CAN Signal
DTC B1685	Engine RPM fault-CAN Signal
DTC B1686	Vehicle Speed Sensor Fault-CAN Signal
DTC B1687	Engine Coolant Temperature Sensor Circuit-CAN Signal
DTC B1688	Cluster Ionizer Fault
DTC B2406	Air Mix Motor-Driver
DTC B2408	Intake Motor
DTC B2409	Direction Control Motor-Driver
DTC B2415	Air Mix Door Motor

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

Air Conditioning System DTCS