What Does B1261 Mean?
This code indicates the Body Control Module (BCM) or Climate Control Module has detected a short to ground in the solar radiation sensor circuit. The solar radiation sensor measures sunlight intensity to help the automatic climate control system adjust cabin temperature and air distribution. A short to ground means the sensor's signal wire or the sensor itself is making unintended contact with vehicle ground, causing abnormally low or zero voltage readings.
Common Causes
45%
Damaged or chafed wiring harness causing short to ground between sensor and control module
30%
Failed solar radiation sensor with internal short to ground
15%
Corroded or moisture-damaged connector terminals at sensor or control module
10%
Control module internal failure causing false short detection
Diagnostic Steps
1
Step 1: Perform visual inspection of solar radiation sensor (typically located on dashboard top near windshield) and wiring harness for obvious damage, pinched wires, or moisture intrusion
2
Step 2: Disconnect solar radiation sensor connector and use a digital multimeter to measure resistance between sensor signal pin and ground - should read open circuit (OL) or very high resistance; low resistance confirms sensor internal short
3
Step 3: With sensor disconnected, measure resistance between sensor signal wire at harness side and known good ground - should read open circuit; low resistance indicates wiring harness short to ground
4
Step 4: Inspect all wiring from sensor to control module, paying special attention to areas where harness passes through metal brackets, near sharp edges, or through firewall grommets for chafing damage
5
Step 5: If wiring is intact, reconnect sensor and backprobe signal wire with multimeter set to DC voltage - should read approximately 0.5-4.5 volts depending on light intensity; reading at or near 0 volts confirms short to ground
6
Step 6: Repair or replace identified faulty component (sensor, wiring, or connector), clear codes, and verify automatic climate control operation responds properly to changes in sunlight intensity
Estimated Repair Cost
$75 - $350
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) or Climate Control Module has detected a short to ground in the solar radiation sensor circuit. The solar radiation sensor measures sunlight intensity to help the automatic climate control system adjust cabin temperature and air distribution. A short...
The most common cause of B1261 (Solar Radiation Sensor Circuit Short To Ground) is: Damaged or chafed wiring harness causing short to ground between sensor and control module
Typical repair costs for B1261 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. This code only affects automatic climate control system performance, causing HVAC to operate without sunlight compensation which may result in uncomfortable cabin temperatures. No safety risk but should be repaired for optimal comfort.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B1261 to identify the root cause.
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Quick Info
Category
Body
System
Climate Control System
Difficulty
Type
Manufacturer
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