B1225Body / Climate

Climate Control In-Car Temperature Sensor

B1225 indicates a fault with the in-car (cabin) temperature sensor used by automatic climate control. A bad reading prevents the system from regulating cabin temperature correctly.

🚗 Yes. Climate control may not regulate temperature accurately, but driving is unaffected.
LOW
severity
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🎯 Top Causes, Ranked by Likelihood

#1Failed in-car temperature sensor$30-$150
40%
A faulty cabin temperature sensor sends an incorrect signal.
#2Wiring or connector fault to the sensor$50-$250
30%
Open or shorted wiring interrupts the sensor signal.
#3Blocked or dirty sensor aspirator$20-$100
15%
A clogged aspirator gives the sensor a false reading.
#4HVAC control module fault$150-$600
15%
An internal module fault can misread the sensor.

🩺 Common Symptoms

💰 Repair Cost: DIY vs Shop

DIY Cost
$30-$200
Shop Cost
$100-$400

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose B1225

1Locate the in-car temperature sensor per service data
2Check the sensor and its aspirator for blockage
3Inspect the sensor wiring and connector
4Test the sensor resistance against specification

❓ Frequently Asked Questions

Can I drive with B1225?
Yes. Only automatic climate control accuracy is affected. Driving is unaffected.
What is the in-car temperature sensor?
It measures cabin air temperature so automatic climate control can maintain your set temperature.
What causes B1225?
A failed cabin temperature sensor, wiring faults, or a blocked sensor aspirator.

🔗 Related Codes

B1230U0424B1218B1220
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