B2135
Low Severity (Level 2)Park Brake Applied Warning Lamp Circuit Failure
B2135 usually means park Brake Applied Warning Lamp Circuit Failure.
Can you still drive with B2135?
⚠️Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
Typical repair cost: $20 – $200
Severity Level 2 — Low
This code indicates a minor issue that is unlikely to cause immediate driveability problems. You can typically continue driving but should have the vehicle inspected at your earliest convenience.
Common Symptoms
- Brake lights not functioning as expected
- Warning light or message on dashboard related to the brake light switch/circuit
- Diagnostic trouble code (DTC) stored in module memory
- Fault may be intermittent — code may clear itself and reappear
- Reduced vehicle functionality related to the brake light switch/circuit
Possible Causes
- Failed brake light switch — internal fault from age, heat cycling, and vibration
- Damaged wiring or corroded connector in the brake light switch/circuit circuit
- Blown fuse for the brake light switch/circuit circuit — check before replacing components
- Faulty control module driving the brake light switch
- Loose or corroded ground point shared by the brake light switch/circuit
Common Fixes
- Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($29-107 at shop, free at auto parts store for basic scan)
- Visually inspect the brake light switch/circuit wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $120 diagnostic fee at shop)
- Replace brake light switch if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($15-150)
- Check and replace any blown fuses in the brake light switch/circuit fuse circuit — if fuse blows again, there's still a short that needs to be found ($2-14 for fuses)
- Perform a wiggle test on the brake light switch/circuit wiring harness while monitoring live data — see if the fault returns when you move the harness at different points ($0-100 diagnostic labor)
Estimated Repair Cost
These are estimated costs based on generic repair data. Actual costs may vary depending on your vehicle, location, and labor rates.
Frequently Asked Questions
What does B2135 mean?
B2135 stands for "Park Brake Applied Warning Lamp Circuit Failure". B2135 usually means park Brake Applied Warning Lamp Circuit Failure.
Can you drive with B2135?
Short-distance driving is usually OK, but have this diagnosed within a week to prevent further damage.
How much does it cost to fix B2135?
Repair costs for B2135 typically range from $20 to $200, depending on your vehicle make, model, and local labor rates. Common fixes include: Scan vehicle with a professional-grade OBD2 scanner to read all stored codes and freeze frame data — note the conditions when the code set ($29-107 at shop, free at auto parts store for basic scan); Visually inspect the brake light switch/circuit wiring harness and connectors — look for chafed wires, melted insulation, green corrosion, loose pins, or rodent damage (often free to check yourself, $120 diagnostic fee at shop); Replace brake light switch if testing confirms it has failed — use OEM quality, avoid the cheapest no-name aftermarket parts that fail in a year ($15-150).
Will B2135 clear itself?
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