Code Definition

C1938 — Invalid Steering Wheel Angle Sensor ID

System: Chassis  |  Type: Manufacturer-Specific  |  Make: Generic

About C1938

C1938 is a manufacturer-specific chassis diagnostic trouble code. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

When C1938 is stored, the module has detected a sensor-related fault — the reported value from the named sensor is out of spec.

Scanning & clearing: Chassis (C) codes are stored in the ABS, traction control, or stability-control modules. An enhanced or OEM-level scan tool is usually required to read and clear them.

C1938 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The steering wheel angle sensor (SAS) communicates with the stability control module (ESP, ESC, or DSC) and identifies itself with a stored identification or configuration value that the module checks against its expected setup. DTC C1938 sets when the module receives an invalid, missing, or mismatched identification from the steering angle sensor, for example after an incorrect sensor part number has been fitted, a replacement sensor has not been coded to the vehicle, or a communication fault corrupts the identification data. Because the module can no longer trust the steering input, the stab...

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