What Does C1780 Mean?
The chassis control module has lost communication with the steering position sensor or the signal is absent. This sensor tells the stability control and suspension systems the angle and rate of steering input. The driver may notice the stability control warning light on, potentially a 'Service AdvanceTrac' or similar message, and the system may disable active stability interventions.
Safety Warning
This is a safety-critical code. Without steering position data, the electronic stability control system cannot function and will be disabled. The vehicle can still be driven, but there is no stability control intervention during emergency maneuvers, skids, or loss-of-traction events. Drive cautiously and have this repaired promptly.
Common Causes
30%
Faulty steering angle sensor (clock spring assembly)
25%
Damaged or loose wiring/connector at steering column sensor
20%
Loss of CAN bus communication between steering sensor and chassis module
15%
Steering angle sensor not calibrated after alignment or component replacement
10%
Chassis control module internal fault on steering signal input
Diagnostic Steps
1
Monitor the steering angle sensor PID in live data while slowly turning the wheel lock to lock — the angle should change smoothly from approximately -720 to +720 degrees with no dropouts, jumps, or freezing.
2
Inspect the clock spring connector under the steering column for secure connection, bent pins, or damage — this is a common failure point especially after steering column or airbag work.
3
Check for CAN bus communication codes in other modules; if multiple modules show communication faults, the issue may be a CAN bus backbone problem rather than the sensor itself.
4
Attempt a steering angle sensor zero-point calibration using the scan tool — drive straight at 15+ mph and command the calibration procedure per manufacturer instructions.
5
If the sensor data is erratic or absent, measure the 5V reference and ground at the sensor connector (should read 4.9-5.1V reference and <0.1V ground) to verify the supply circuit integrity.
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The chassis control module has lost communication with the steering position sensor or the signal is absent. This sensor tells the stability control and suspension systems the angle and rate of steering input. The driver may notice the stability control warning light on, potentially a 'Service Advan...
The most common cause of C1780 (Loss of Steering Position Signal) is: Faulty steering angle sensor (clock spring assembly)
Typical repair costs for C1780 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
This is a safety-critical code. Without steering position data, the electronic stability control system cannot function and will be disabled. The vehicle can still be driven, but there is no stability control intervention during emergency maneuvers, skids, or loss-of-traction events. Drive cautiously and have this repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1780 to identify the root cause.
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Quick Info
Category
Chassis
System
Electronic Stability Control / Steering System
Difficulty
Type
Manufacturer
Recommended Tools
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