C1262 Lamp Warning Relay Circuit Failure
The C1262 code indicates a fault in the lamp warning relay circuit, which is responsible for supplying power to the ABS and brake warning lights on the dashboard. When the ABS/TRAC control module detects a short circuit, open circuit, or abnormal voltage drop in this relay control circuit, it stores this diagnostic trouble code. This relay is critical for alerting the driver to system malfunctions.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or damaged lamp warning relay
- Short circuit or open circuit in the relay wiring
- Corroded electrical connections or loose terminals at the relay or control module connector
- Blown fuse in the warning lamp circuit
- Internal failure of the ABS/TRAC control module
3. Symptoms You Will Notice
- ABS warning light illuminated on the dashboard
- Brake warning light illuminated on the dashboard
- Possible loss of ABS or traction control functionality
4. Step-by-Step Diagnosis
Check the warning lamp relay fuse and replace if blown
Inspect the relay and its wiring for signs of damage, corrosion, or loose connections
Test the relay operation using a multimeter or by swapping with a known good relay
Check for continuity and voltage at the relay control circuit from the ABS module
If all else is normal, test the ABS/TRAC control module for internal faults
5. Frequently Asked Questions
Is it safe to drive?▼
You can drive, but the ABS and traction control systems may be disabled. Braking performance is reduced in slippery conditions, so drive cautiously and have the issue diagnosed soon.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the relay, wiring, or control module needs replacement.