What Does B2606 Mean?
DTC B2606 indicates the Body Control Module (BCM) or climate control module has detected a signal from the A/C temperature sensor that is outside the expected voltage or resistance range. This sensor monitors evaporator temperature or cabin air temperature to regulate climate control system operation. The out-of-range reading could be due to an open circuit, short circuit, or sensor failure preventing proper A/C system regulation.
Common Causes
45%
Faulty A/C temperature sensor with internal failure causing incorrect resistance values
30%
Damaged, corroded, or loose wiring connector at the temperature sensor
15%
Open or short circuit in sensor wiring harness between sensor and control module
10%
Failed Body Control Module or climate control module with faulty sensor circuit
Diagnostic Steps
1
Step 1: Perform visual inspection of the A/C temperature sensor location (typically mounted on evaporator housing or in HVAC case). Check sensor connector for corrosion, moisture, pushed-out pins, and secure connection. Wiggle connector while monitoring live data for intermittent readings.
2
Step 2: Using a digital multimeter, backprobe the sensor connector and measure resistance across sensor terminals with ignition off. Compare readings to manufacturer specifications (typically 2-5k ohms at room temperature for thermistor-type sensors). Verify resistance changes smoothly when temperature changes.
3
Step 3: Disconnect the sensor and measure voltage at the harness connector from the BCM. Verify reference voltage (typically 5V) and ground integrity. Measure resistance of sensor circuit wiring from connector to BCM to check for opens or shorts to ground/power (should read OL to ground/power, low resistance to BCM pins).
4
Step 4: If wiring and power/ground are good, replace the A/C temperature sensor. Clear codes, cycle the A/C system through all modes, and monitor live sensor data to verify readings are within normal range (typically -40°F to 160°F depending on conditions). Verify A/C system operates normally and code does not return.
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
DTC B2606 indicates the Body Control Module (BCM) or climate control module has detected a signal from the A/C temperature sensor that is outside the expected voltage or resistance range. This sensor monitors evaporator temperature or cabin air temperature to regulate climate control system operatio...
The most common cause of B2606 (A/C Temperature Sensor Out of Range) is: Faulty A/C temperature sensor with internal failure causing incorrect resistance values
Typical repair costs for B2606 range from $75 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to continue driving. The vehicle remains operational but the A/C system may not regulate temperature properly, may blow excessively cold air, or compressor may cycle abnormally. Repair at convenience but address before summer months for comfort.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2606 to identify the root cause.
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Quick Info
Category
Body
System
Climate Control / HVAC System
Difficulty
Type
Generic (SAE)
Recommended Tools
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