🚨 Diagnostic Profile
- Vehicle/Equipment Make: GENERIC
- Technical Description: Right Park Brake Actuator Control Circuit Low
This code is set by the Electronic Brake Control Module (EBCM) or the dedicated Electric Park Brake (EPB) module when it detects a voltage reading lower than expected on the control circuit feeding the right-side park brake actuator motor. The module commands the actuator to apply or release the parking brake by sending a controlled voltage signal through this circuit. When the returned voltage is lower than the calibrated threshold, the module interprets this as a short to ground, excessive resistance in the wiring, a failing actuator motor winding, or a problem within the module’s internal driver circuit itself. This is strictly a chassis-level fault related to the brake system’s electromechanical actuator network, wheel-end hardware, and the stability/traction control module that manages brake-by-wire functions. It has no relation to engine performance or powertrain operation.
🚨 Repair Difficulty Tier
- Difficulty Rating: Intermediate
This repair requires a capable scan tool that can communicate with the chassis/ABS module to pull live actuator voltage data and freeze frame information, along with a digital multimeter to test circuit resistance and continuity. While the actuator itself may be accessible to a confident DIYer, bleeding or recalibrating the EPB system after repairs often requires bi-directional scan tool functions not found in basic code readers.
🛠️ Resolution Steps
- Step 1: Preliminary Inspection
Begin by visually inspecting the right rear caliper area where the park brake actuator motor is mounted. Look for corrosion, chafed wiring, disconnected connectors, or evidence of water intrusion near the actuator harness. Check the connector pins for green corrosion or bent terminals, as this is a common cause of a low-voltage short condition. - Step 2: Diagnostic Verification
Using a digital multimeter, disconnect the actuator connector and measure resistance across the two control circuit wires to check for a short to chassis ground (a reading close to zero ohms indicates a fault). With the key on and using a scan tool, command a bi-directional test of the park brake actuator (if supported) while monitoring live voltage data to see if the circuit behaves erratically during operation. Also check the actuator’s internal motor resistance against manufacturer specifications to rule out a seized or shorted winding. - Step 3: Resolution & Reset Process
If wiring is found damaged, repair or replace the harness section and reseal connectors with dielectric grease to prevent future corrosion. If the actuator motor fails resistance specifications, replace the right park brake actuator assembly. After any repair, use the scan tool to clear the stored chassis code and perform the required EPB calibration or service mode procedure so the module can relearn the actuator’s resting and clamping positions.
📦 Parts, Labor, and Budget Estimates
- Required Components/Software: Right park brake actuator motor assembly, wiring harness repair kit/connector, dielectric grease, bi-directional capable scan tool for EPB calibration
- Average Component Price: $90 – $220 USD
- Estimated Labor Hours: 1.0 – 2.0 hours
- Total Estimated Budget: $180 – $400 USD