Lateral Acceleration Sensor Circuit Failure
Diagnostic trouble code C1959 indicates an electrical fault in the lateral acceleration sensor circuit. This sensor is a critical component of the AdvanceTrac/Electronic Stability Control (ESC) and airbag systems, measuring lateral G-forces to detect skidding or rollover risk. According to SAE J2012, this chassis system code points to an open, short, or out-of-range reading in the accelerometer circuit.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or damaged lateral acceleration sensor
- Short or open circuit in the sensor wiring
- Corroded or loose electrical connections in the sensor harness
- Damaged stability control module (RCM or ABS)
- Incorrect voltage supply or ground to the sensor
3. Symptoms You Will Notice
- Illuminated Check Engine Light or stability control warning light
- Reduced or disabled stability control and traction control
4. Step-by-Step Diagnosis
Scan for additional codes and verify C1959 is present
Inspect the lateral acceleration sensor connector and wiring for damage, corrosion, or loose pins
Test sensor voltage supply and ground circuits with a multimeter
Check sensor resistance and output signal per manufacturer specifications
If sensor and wiring are okay, test the stability control module for proper operation
5. Frequently Asked Questions
Is it safe to drive?▼
No, driving with code C1959 is not recommended because the stability control and airbag systems may be compromised, increasing the risk of loss of control or improper airbag deployment in a crash.
How much does it cost to fix?▼
Repair costs typically range from $200 to $800, depending on whether the sensor itself needs replacement ($100–$300) or if wiring repairs or module replacement are required.