What Does B0348 Mean?
This code indicates that the Body Control Module (BCM) or climate control module has detected an open circuit in the sunload temperature sensor. This sensor measures solar radiation intensity to help the automatic climate control system adjust cabin temperature and airflow based on sun exposure. An open circuit means the sensor is not communicating with the control module due to a break in wiring, connector issue, or failed sensor.
Common Causes
35%
Broken or corroded wiring between sunload sensor and BCM/climate control module
30%
Failed sunload temperature sensor (typically mounted on dashboard near windshield)
20%
Loose or disconnected electrical connector at sensor or module
10%
Damaged or corroded pins in BCM or climate control module connector
5%
Failed BCM or climate control module (rare)
Diagnostic Steps
1
Step 1: Locate the sunload sensor (typically on top of dashboard near windshield defrost vents) and perform visual inspection of sensor, connector, and visible wiring for damage, corrosion, or disconnection
2
Step 2: Using a multimeter, check for continuity across the sensor terminals with connector disconnected (should read 5k-50k ohms typically, consult service manual for spec); infinite resistance indicates open/failed sensor
3
Step 3: With sensor disconnected, check continuity of wiring from sensor connector to BCM/climate control module connector using wiring diagram; infinite resistance indicates open circuit in harness
4
Step 4: Inspect all connector pins for corrosion, bent pins, or pushed-back terminals at both sensor and module ends; clean or repair as needed
5
Step 5: If wiring and connections are intact, replace sunload sensor and verify resistance values within specification
6
Step 6: Clear codes, test automatic climate control operation through various conditions, and verify no code returns after test drive in sunlight
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) or climate control module has detected an open circuit in the sunload temperature sensor. This sensor measures solar radiation intensity to help the automatic climate control system adjust cabin temperature and airflow based on sun exposure. An ...
The most common cause of B0348 (Sunload Temperature Sensor Open) is: Broken or corroded wiring between sunload sensor and BCM/climate control module
Typical repair costs for B0348 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This code does not affect vehicle safety or drivability. The automatic climate control system will operate in a default mode without solar compensation, which may result in less optimal cabin temperature control, but all basic HVAC functions remain operational.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B0348 to identify the root cause.
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Quick Info
Category
Body
System
Automatic Climate Control System
Difficulty
Type
Generic (SAE)
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