What Does B2535 Mean?
This code indicates the Body Control Module (BCM) has detected an electrical fault in the right rear turn signal lamp circuit. The BCM monitors the circuit for proper current flow and resistance, and has identified either an open circuit, short to ground, short to power, or excessive resistance preventing normal turn signal operation. This affects the vehicle's exterior lighting system and directional signaling capability.
Common Causes
45%
Burnt out or failed turn signal bulb with damaged socket contacts
30%
Corroded, loose, or damaged wiring connector at lamp assembly
15%
Damaged or chafed wiring between BCM and lamp assembly causing short or open circuit
10%
Failed Body Control Module output driver circuit
Diagnostic Steps
1
Step 1: Visually inspect the right rear turn signal bulb for signs of filament failure, blackening, or physical damage. Remove bulb and check socket for corrosion, melted terminals, or moisture intrusion.
2
Step 2: With ignition on and turn signal activated, use a test light or multimeter to verify power and ground at the lamp socket connector (disconnect socket first). Expected reading: 12V pulsing signal on power wire, solid ground on ground wire.
3
Step 3: If voltage is present at socket but bulb is good, check socket resistance to ground with multimeter (should be less than 0.5 ohms). If no voltage at socket, backprobe the BCM connector for the right rear turn signal output while activating turn signal.
4
Step 4: Inspect wiring harness from BCM to lamp assembly for damage, pinch points, or corrosion, particularly in areas where harness passes through body panels or near the rear suspension. Perform continuity test on affected wire with BCM disconnected.
5
Step 5: After repairs, clear codes and cycle turn signals in both directions multiple times to verify BCM recognizes proper circuit function and code does not return.
Estimated Repair Cost
$50 - $400
Parts + labor, varies by vehicle and location
This code indicates the Body Control Module (BCM) has detected an electrical fault in the right rear turn signal lamp circuit. The BCM monitors the circuit for proper current flow and resistance, and has identified either an open circuit, short to ground, short to power, or excessive resistance prev...
The most common cause of B2535 (Right Rear Turn Lamp Circuit Failure) is: Burnt out or failed turn signal bulb with damaged socket contacts
Typical repair costs for B2535 range from $50 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle is legal to drive but poses a safety risk as other drivers cannot see turn signal intentions, increasing collision risk during lane changes and turns. Repair should be completed promptly to maintain legal compliance and road safety, especially before night driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to B2535 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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