What Does B2427 Mean?
This code indicates that the Body Control Module (BCM) has detected a short to ground in the passenger-side solar radiation sensor circuit. This sensor measures sunlight intensity on the passenger side of the vehicle to help the automatic climate control system adjust air distribution and temperature for optimal cabin comfort. The BCM has identified that the signal voltage is being pulled to ground, preventing normal sensor operation.
Common Causes
45%
Damaged or chafed wiring harness causing short to ground between sensor and BCM
30%
Failed passenger solar radiation sensor with internal short circuit
15%
Corroded or moisture-damaged sensor connector causing ground short
10%
BCM internal circuit failure or damaged BCM connector terminal
Diagnostic Steps
1
Step 1: Locate the passenger solar radiation sensor (typically mounted on dashboard near windshield on passenger side) and visually inspect the sensor, connector, and wiring for obvious damage, chafing, pinching, or corrosion
2
Step 2: Disconnect the passenger solar sensor connector and measure resistance between the signal wire terminal on the harness side and known good ground using a digital multimeter. Reading should be greater than 10,000 ohms (open circuit); low resistance indicates short to ground in harness
3
Step 3: If harness tests good, measure resistance across the sensor terminals with sensor disconnected. Compare readings to manufacturer specifications (typically 1-10k ohms depending on light conditions). Zero or near-zero resistance indicates failed sensor with internal short
4
Step 4: If wiring harness shows short to ground, trace the wire route from sensor to BCM checking for pinch points at door jambs, under carpet, behind dashboard, and through firewall. Look for contact with sharp metal edges or moving parts
5
Step 5: Repair or replace damaged wiring/connectors or replace faulty sensor as needed. Clear codes, verify sensor operation by monitoring live data for signal voltage changes when covering/uncovering sensor with hand or cloth
6
Step 6: Test automatic climate control system response to verify proper operation with passenger-side temperature adjustment functioning correctly based on solar load
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
This code indicates that the Body Control Module (BCM) has detected a short to ground in the passenger-side solar radiation sensor circuit. This sensor measures sunlight intensity on the passenger side of the vehicle to help the automatic climate control system adjust air distribution and temperatur...
The most common cause of B2427 (Passenger Solar Radiation Sensor Circuit Short to Ground) is: Damaged or chafed wiring harness causing short to ground between sensor and BCM
Typical repair costs for B2427 range from $120 to $450, 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 and the vehicle can be operated normally. The automatic climate control system may not properly compensate for sunlight on the passenger side, resulting in less optimal cabin temperature comfort until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2427 to identify the root cause.
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Quick Info
Category
Body
System
Automatic Climate Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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