C112A on 2016-2020 Mazda CX-5 (Touring, Grand Touring, Signature) — Incorrect Electric Parking Brake Motor Gear Unit Position
1 vehicles · 1 makes · $150-$900 repair
How to diagnose and fix C112A: most-reported vehicles
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Mazda CX-5 · 2016–2020
CX-5 trims with the electronic parking brake can throw an 'Electric parking brake malfunction' warning with the brake failing to fully release or engaging on only one side. Common causes are a failed EPB caliper actuator motor and, frequently, a bent/corroded pin in the actuator electrical connector that breaks signal continuity. The problem is often triggered after a rear brake-pad service that wasn't done in EPB maintenance/service mode, which strips the motor's gear position. Owners report stored codes for motor gear position mismatch.
Common Symptoms
- 'Electric parking brake malfunction' warning message
- Parking brake won't release or releases on one side only
- ABS/brake warning lights
- Grinding or no movement from the EPB motor
How to Fix
Always retract the EPB using the maintenance/service mode (scan tool or owner's-manual procedure) before rear pad service. Diagnose with a scanner for C2005 / C112A-type motor-position codes, then inspect the actuator connector for bent or corroded pins (a frequently overlooked fix) before condemning the motor. If the actuator motor itself has failed, replace it with the genuine Mazda unit and recalibrate. DIY actuator parts run ~$150-$350 each; dealer diagnosis + replacement typically $400-$900.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mazda KA0G-26-8EXA EPB motor/parking-brake actuatorOEMMazda KA0G-26-8EXA
Replace a side-confirmed failed rear electronic parking-brake motor Fitment/availability: Live direct dealer page identifies genuine KA0G-26-8EXA for the CX-5, priced with Add to Cart.
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Sources for this issue (3)
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C112A code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C112A mean?
C112A stands for "Incorrect Electric Parking Brake Motor Gear Unit Position." Manufacturer-specific chassis code, documented for Mazda electric parking brake (EPB) systems. The ABS/EPB control module monitors the position of the parking brake motor gear unit as the brake applies and releases, and has determined the gear unit is not where it should be. The parking brake may fail to apply or release fully, and the parking brake warning light will usually be on. Treat this as a safety item - do not rely on the parking brake to hold the vehicle until it is repaired.
What are the most common causes of C112A?
The most common causes of C112A are: Failed electric parking brake motor / caliper actuator on one rear wheel, Open or shorted wiring in the EPB motor circuit, Poor or corroded connection at the EPB motor connector, Seized caliper or worn rear brake pads preventing the gear unit reaching its expected position, EPB system left out of calibration after rear brake service performed without using service/maintenance mode. The specific cause varies by vehicle.
How much does it cost to fix C112A?
Repair costs for C112A range from $150 to $900, depending on the vehicle and root cause.
Which vehicles are affected by C112A?
Au7o has documented C112A across 1 vehicle models from 1 manufacturers: Mazda.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.