B0226
Dome Lamp Switch Circuit Malfunction
Lowsensor
Overview
The B0226 diagnostic trouble code indicates that the body control module has identified a dome lamp switch circuit malfunction issue. This code means a body sensor or its circuit is not providing expected readings. Accurate sensor data is important for proper operation of safety and convenience systems throughout the vehicle.
Symptoms
- Speedometer reading incorrectly
- Check Engine Light (MIL) illuminated
- Erratic gauge readings on dashboard
- Poor engine performance
Common Causes
- Failed speed sensor or position sensor
- Water intrusion in sensor connector
- Corroded or damaged sensor connector
- Faulty PCM/ECM not reading sensor correctly
Diagnosis Steps
- 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
- 2Locate the specific sensor referenced by the code
- 3Inspect the sensor connector for corrosion, damage, or loose pins
- 4Test the sensor output using a multimeter or scan tool live data
- 5Check the wiring between the sensor and the PCM for opens or shorts
Estimated Repair Cost
$75 — $350
Cost varies by vehicle, location, and repair shop. Includes parts and labor.
Commonly Affected Vehicles
Nissan SentraMazda 3Chevrolet CruzeFord Focus
Related Codes
More Sensor Codes
P0070Ambient Air Temperature Sensor Circuit
LowP0071Ambient Air Temperature Sensor Range/Performance
LowP0072Ambient Air Temperature Sensor Circuit Low
LowP0073Ambient Air Temperature Sensor Circuit High
LowP0074Ambient Air Temperature Sensor Circuit Intermittent
LowP0095Intake Air Temperature Sensor 2 Circuit
LowFrequently Asked Questions
Most automotive sensors last 80,000-150,000 miles, though this varies by sensor type and driving conditions. Oxygen sensors and temperature sensors tend to degrade gradually over time.