Code Definition

C112A (77) — Incorrect EPB Motor Gear Unit Position

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

About C112A

C112A is a manufacturer-specific chassis diagnostic trouble code recorded for Mazda vehicles. It belongs to the C-prefix family of codes, which covers chassis, braking, steering, suspension, or stability-control faults.

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.

C112A 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 Electronic Parking Brake (EPB) control module monitors the motor gear unit position using internal position feedback to confirm correct movement and end stop alignment during apply and release operations. DTC C112A:77 is set when the module detects that the actual gear unit position does not correspond with the commanded or learned position, or when the position feedback is implausible during operation or calibration. The EPB actuator uses an electric motor driving a gear reduction unit to clamp the rear brakes, and the module tracks travel through motor current and position feedback. When...

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