C0190
Brake Lamp Switch Circuit Malfunction
Moderateelectrical
Overview
The C0190 code indicates that the chassis control module has detected a brake lamp switch circuit malfunction condition. This diagnostic trouble code relates to the electrical control circuits within the vehicle's chassis safety systems, including ABS, traction control, and stability control. When this code is stored, one or more chassis safety features may be disabled, which can reduce braking performance and vehicle stability under adverse driving conditions.
Symptoms
- Power steering assist reduced or lost
- ABS warning light illuminated on dashboard
- Traction control warning light on
- Reduced braking performance in emergency stops
Common Causes
- Blown fuse or faulty relay in ABS circuit
- Corroded or damaged wiring in the ABS harness
- Failed power steering control module
- Faulty ABS control module (EBCM)
Diagnosis Steps
- 1Connect an OBD-II scanner and read all stored chassis trouble codes and freeze frame data
- 2Inspect the ABS/ESC module connectors for corrosion, damage, or loose pins
- 3Check the ABS fuse and relay in the fuse box; replace if blown or faulty
- 4Test the ABS pump motor operation using a scan tool bi-directional command
- 5Measure circuit voltage and ground at the ABS module with a multimeter
Estimated Repair Cost
$150 — $1,200
Cost varies by vehicle, location, and repair shop. Includes parts and labor.
Commonly Affected Vehicles
Toyota CamryChevrolet SuburbanToyota TundraDodge Ram 1500
Related Codes
More Electrical Codes
B0001Driver Frontal Airbag Deployment Loop Circuit Open
CriticalB0002Driver Frontal Airbag Deployment Loop Circuit Short to Ground
CriticalB0003Driver Frontal Airbag Deployment Loop Circuit Short to Battery
CriticalB0004Driver Frontal Airbag Deployment Loop Resistance Too High
CriticalB0005Driver Frontal Airbag Deployment Loop Resistance Too Low
CriticalB0006Passenger Frontal Airbag Deployment Loop Circuit Open
CriticalFrequently Asked Questions
Your standard brakes will still work, but the anti-lock braking function is disabled. This means wheels can lock up during hard braking, especially on wet or icy roads. Avoid aggressive driving and have the system inspected promptly.