OBD-II DTC C1949 – Accelerometer Sensor Circuit Open
DTC C1949 meaning
DTC C1949 refers to an issue with the accelerometer sensor circuit, indicating that there is an open circuit condition. This means that the signal from the accelerometer sensor, which is responsible for detecting changes in vehicle motion, is not being transmitted properly to the vehicle’s control module. The open circuit can result from a variety of electrical issues, including broken wires, poor connections, or a faulty sensor itself.
DTC C1949 symptoms
Common symptoms associated with DTC C1949 may include:
- Illumination of the check engine light or warning indicator
- Erratic or unresponsive vehicle handling
- Inconsistent stability control or traction control performance
- Potential activation of other related DTCs
DTC C1949 causes
The causes of DTC C1949 can include:
- Open or broken wiring in the accelerometer sensor circuit
- Corroded or loose electrical connectors
- Faulty accelerometer sensor
- Issues with the vehicle’s control module
DTC C1949 seriousness
DTC C1949 can be considered serious as it affects the vehicle’s stability and handling. If the accelerometer sensor is not functioning correctly, it can lead to compromised safety features such as traction control and stability control, increasing the risk of loss of control during driving conditions.
How to diagnose DTC C1949
To diagnose DTC C1949, follow these steps:
- Use an OBD-II scanner to confirm the presence of the DTC.
- Inspect the wiring and connectors associated with the accelerometer sensor for any visible damage or corrosion.
- Check the resistance and continuity of the sensor circuit using a multimeter.
- Test the accelerometer sensor itself to ensure it is functioning within specifications.
- Examine the vehicle’s control module for any faults or issues.
How to fix DTC C1949 step-by-step instructions
To fix DTC C1949, follow these steps:
- Identify and repair any damaged wiring or connectors in the accelerometer sensor circuit.
- Replace the accelerometer sensor if it is found to be faulty.
- Ensure all connections are secure and free from corrosion.
- Clear any stored DTCs using an OBD-II scanner.
- Test drive the vehicle to ensure the issue is resolved and the DTC does not reappear.
How to erase DTC C1949
To erase DTC C1949, follow these steps:
- Connect an OBD-II scanner to the vehicle’s diagnostic port.
- Access the diagnostic menu and select the option to clear or erase trouble codes.
- Confirm the action and wait for the scanner to complete the process.
- Disconnect the scanner and perform a test drive to ensure the DTC does not return.
Recommended tools for OBD-II diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.