What Does C1951 Mean?
The stability control module has detected an open circuit in the lateral (side-to-side) accelerometer sensor. This sensor measures the g-forces acting on the vehicle during turns and is essential for calculating whether the vehicle is sliding, rolling, or experiencing understeer/oversteer. Without this input, the ESC system cannot determine lateral dynamics and will be fully disabled. The driver will see ESC warning lights.
Common Causes
35%
Disconnected or corroded connector at the lateral accelerometer sensor
25%
Broken wire in the harness between the sensor and the ESC module
20%
Failed lateral accelerometer sensor (internal open circuit in the MEMS device)
15%
Water damage to the sensor or connector — sensor is often mounted low and near the center tunnel
5%
ESC module connector damage or backed-out pin on the lateral accelerometer circuit
Diagnostic Steps
1
Locate the lateral accelerometer sensor — on many vehicles it is integrated with the yaw rate sensor in a single unit mounted under the center console or on the transmission tunnel. Verify the connector is fully seated and locked.
2
With the sensor disconnected, check for 5V reference voltage and ground at the ESC module's sensor connector pins. If either is missing, the fault is in the module or supply wiring.
3
Check continuity of all three wires (5V reference, signal, ground) from the sensor connector to the ESC module. An open on any wire will trigger this code.
4
Inspect the wiring route for damage — especially at floor pan pass-throughs, under carpet areas prone to water pooling, and near center console mounting brackets that can pinch wires during service.
5
If wiring is intact, measure the sensor output directly. With the connector plugged in, backprobe the signal wire — on a level surface, it should read approximately 2.5V. No output indicates an internal sensor failure requiring replacement.
Estimated Repair Cost
$100 - $600
Parts + labor, varies by vehicle and location
The stability control module has detected an open circuit in the lateral (side-to-side) accelerometer sensor. This sensor measures the g-forces acting on the vehicle during turns and is essential for calculating whether the vehicle is sliding, rolling, or experiencing understeer/oversteer. Without t...
The most common cause of C1951 (Lateral Accelerometer Sensor Circuit Open) is: Disconnected or corroded connector at the lateral accelerometer sensor
Typical repair costs for C1951 range from $100 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
ESC and traction control are disabled. The vehicle cannot detect or correct lateral instability such as oversteer or understeer during cornering. ABS basic function remains operational. Avoid high-speed turns, wet/icy conditions, and evasive maneuvers. Repair promptly — this is a critical safety sensor.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1951 to identify the root cause.
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Quick Info
Category
Chassis
System
Stability Control / Traction Control
Difficulty
Type
Manufacturer
Recommended Tools
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