OBD2 Car ScannerWhat does C0038 mean?
C0038 stands for Left Rear Wheel Speed Sensor Supply (Subfault). A chassis module has found a fault in a system like ABS, traction or stability control, steering or suspension.
Chassis codes cover the ABS, traction control, steering and suspension. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.
Common causes
- Faulty or dirty wheel speed sensor
- Damaged sensor wiring
- Low brake fluid
- Faulty ABS pump or module
What to do
- Read all stored and pending codes with a scanner. Several codes together often point to one cause.
- Note the freeze frame data (speed, temperature, load) recorded when the code was set.
- Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
- Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.
Read this code from your own car
Plug in a cheap ELM327 adapter and the app shows every fault code, what it means and how to fix it.
Frequently asked questions
What does C0038 mean?
C0038 means “Left Rear Wheel Speed Sensor Supply (Subfault)”. It belongs to the chassis system group: A chassis module has found a fault in a system like ABS, traction or stability control, steering or suspension.
Is it safe to drive with C0038?
Avoid driving long distances. This kind of fault can cause damage or affect safety, so get it checked as soon as possible.
How do I clear C0038?
Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.
Related codes
- C0034Right Front Wheel Speed Sensor (Subfault)
- C0035Right Front Wheel Speed Sensor Supply (Subfault)
- C0036Left Rear Tone Wheel (Subfault)
- C0037Left Rear Wheel Speed Sensor (Subfault)
- C0039Right Rear Tone Wheel (Subfault)
- C003ARight Rear Wheel Speed Sensor (Subfault)
- C003BRight Rear Wheel Speed Sensor Supply (Subfault)
- C003CRear Tone Wheel (Subfault)
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.