What Does C0288 Mean?
This code indicates that the brake warning lamp circuit has a short circuit to battery positive voltage (B+). The ABS/brake control module has detected that the brake warning light circuit is receiving voltage when it should not be, causing the lamp to illuminate improperly or creating a feedback condition. This affects the brake warning system's ability to properly alert the driver to actual brake system faults.
Common Causes
45%
Damaged wiring harness with insulation worn through, causing direct contact with B+ power source in instrument cluster area or bulkhead connector
30%
Faulty instrument cluster with internal short circuit in brake warning lamp driver circuit or printed circuit board
15%
Shorted brake warning lamp bulb socket or LED module with pins contacting power terminal
10%
Failed ABS/brake control module with internal output driver failure causing internal short
Diagnostic Steps
1
Step 1: Visually inspect the instrument cluster wiring harness, connectors, and brake warning lamp bulb/socket for obvious damage, melted insulation, or signs of chafing against sharp edges. Check for aftermarket modifications or repairs.
2
Step 2: Disconnect the instrument cluster connector and use a multimeter to measure voltage on the brake warning lamp circuit wire at the harness side (vehicle side). With ignition on, this wire should show 0V when not activated. If B+ voltage is present, trace the wire back toward the ABS module for wiring shorts.
3
Step 3: If no voltage is found at the harness, reconnect the cluster and backprobe the brake warning lamp circuit at the cluster connector. Measure voltage with ignition on. If B+ is now present, the short is internal to the instrument cluster.
4
Step 4: Remove and inspect the brake warning lamp bulb or LED module for signs of internal short, bent terminals, or foreign material bridging contacts. Replace if damaged.
5
Step 5: If all wiring and bulb checks pass, perform a resistance test on the brake warning lamp circuit with both ends disconnected. Resistance to B+ should be infinite (open circuit). Any continuity indicates a wiring short requiring harness repair or replacement.
6
Step 6: After repairs, clear codes and perform a bulb check test through the scan tool or ignition key cycle. Verify the brake warning lamp operates normally and no codes return during test drive with multiple brake applications.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
This code indicates that the brake warning lamp circuit has a short circuit to battery positive voltage (B+). The ABS/brake control module has detected that the brake warning light circuit is receiving voltage when it should not be, causing the lamp to illuminate improperly or creating a feedback co...
The most common cause of C0288 (Brake Warning Lamp Circuit Shorted to B+) is: Damaged wiring harness with insulation worn through, causing direct contact with B+ power source in instrument cluster area or bulkhead connector
Typical repair costs for C0288 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is generally safe to drive, but the brake warning system is compromised and may not properly alert you to actual brake problems such as low brake fluid, parking brake engagement, or ABS faults. Repair promptly to restore critical safety warning functionality.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C0288 to identify the root cause.
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Quick Info
Category
Chassis
System
Brake Warning System / Instrument Cluster
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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