B2526: Left Reverse Lamp Circuit Short to Battery
The B2526 code indicates that the vehicle's body control module (BCM) or lighting control module has detected a short circuit to battery voltage in the left reverse lamp circuit. This means the circuit is seeing battery voltage when it should be off or at normal lamp resistance. The code falls under body network codes for exterior lighting.
1. Commonly Affected Makes
2. Most Common Causes
- Wiring in the left reverse lamp circuit shorted to battery voltage
- Left reverse lamp internally shorted
- Lamp connector with bent pins, corrosion, or moisture causing a short
- Faulty BCM or lighting control module
- Damaged wiring splice or junction allowing contact with another energized circuit
3. Symptoms You Will Notice
- Left reverse lamp stays on continuously or is inoperative
- Blown fuse for reverse lamp circuit
4. Step-by-Step Diagnosis
Visually inspect left reverse lamp connector for damage, corrosion, or bent pins
Check wiring harness for chafing or contact with battery voltage sources
Test left reverse lamp bulb for internal short
Measure voltage at lamp connector with ignition on and reverse not engaged; should be near 0V
If wiring and lamp are OK, suspect BCM or lighting module fault
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the severity is low. The vehicle can be driven, but the reverse lamp may not function properly, which could be a safety concern when backing up.
How much does it cost to fix?▼
Typically $100 to $300, depending on the cause. A simple bulb or connector repair may be under $100, while BCM replacement can be $300 or more.