OBD2 Car ScannerWhat does C1949 mean?
C1949 stands for Accelerometer Sensor Circuit Open. 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 C1949 mean?
C1949 means “Accelerometer Sensor Circuit Open”. 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 C1949?
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 C1949?
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
- C1945Park Switch Indicates Park with Vehicle Moving
- C1946Seat Track Position Switch Circuit Open
- C1947Seat Track Position Switch Circuit Short to Ground
- C1948Seat Track Position Switch Circuit Resistance Out of Range
- C1950Accelerometer Sensor Circuit Failure
- C1951Lateral Accelerometer Sensor Circuit Open
- C1952Yaw Rate Sensor Circuit Open
- C1953Master Cylinder Pressure Sensor Circuit Open
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.