What Does B2536 Mean?
This code indicates the Body Control Module (BCM) has detected that the right rear turn signal lamp circuit is experiencing a short to battery voltage. This means the circuit is receiving constant power when it should only be energized when the turn signal is activated. The BCM monitors the turn signal circuits for proper operation and sets this code when it detects voltage present on the circuit when the turn signal switch is in the off position.
Common Causes
45%
Damaged or chafed wiring harness causing the turn signal wire to contact a power wire or circuit
30%
Failed turn signal bulb socket with internal short to power circuit within the tail light assembly
15%
Moisture intrusion or corrosion in tail light assembly causing short between power and signal circuits
10%
Faulty Body Control Module with internal relay or driver circuit malfunction
Diagnostic Steps
1
Step 1: Perform visual inspection of the right rear tail light assembly for signs of damage, moisture intrusion, melted connectors, or burned terminals. Remove bulb and inspect socket for signs of overheating or corrosion.
2
Step 2: Disconnect the right rear tail light assembly connector. Using a digital multimeter, check for voltage on the turn signal wire at the harness side connector with the turn signal switch OFF. Battery voltage present indicates a wiring harness short; no voltage indicates the short is within the tail light assembly.
3
Step 3: If voltage is present at the harness connector, trace the turn signal wire from the BCM to the tail light along the body, through grommets, and in the tailgate/trunk area. Look for pinched, chafed, or damaged wiring. Use a wiring diagram to identify the wire color and routing.
4
Step 4: If no voltage at harness connector, replace the tail light assembly or bulb socket as the short is internal. Reconnect and verify the turn signal operates correctly with no voltage present when switch is OFF.
5
Step 5: Clear the DTC code and perform a test drive with multiple turn signal activations. Monitor live data for turn signal circuit voltage and confirm proper on/off cycling without continuous battery voltage present.
Estimated Repair Cost
$75 - $450
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected that the right rear turn signal lamp circuit is experiencing a short to battery voltage. This means the circuit is receiving constant power when it should only be energized when the turn signal is activated. The BCM monitors the turn sig...
The most common cause of B2536 (Right Rear Turn Lamp Circuit Short to Battery) is: Damaged or chafed wiring harness causing the turn signal wire to contact a power wire or circuit
Typical repair costs for B2536 range from $75 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is safe to drive but turn signal function may be compromised, creating a safety hazard for lane changes and turns. Repair should be completed promptly to maintain proper communication with other drivers and comply with vehicle lighting regulations.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2536 to identify the root cause.
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Quick Info
Category
Body
System
Exterior Lighting System
Difficulty
Type
Generic (SAE)
Recommended Tools
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