🚨 Diagnostic Profile
- Vehicle/Equipment Make: GENERIC
- Technical Description: Right Park Brake Actuator Control Circuit High
This chassis-based trouble code is set by the Electronic Brake Control Module (EBCM) when it detects a voltage reading that is higher than the expected calibrated range on the control circuit feeding the right-side Electric Park Brake (EPB) actuator motor. The EBCM commands the actuator motor to apply or release the park brake caliper by sending a specific current/voltage signal. A ‘Circuit High’ condition typically indicates that the actuator is receiving excessive voltage, there is a short circuit to a higher voltage source (such as a chafed wire contacting a 12V+ source), an open ground connection causing voltage to backfeed, or an internal failure within the actuator motor assembly itself. This fault will almost certainly disable the Electric Park Brake function, illuminate the Park Brake and/or ABS warning indicators on the dashboard, and may disable the traction control and stability control systems as a protective measure since they rely on the same module architecture.
🚨 Repair Difficulty Tier
- Difficulty Rating: Professional Only
This repair requires a capable bi-directional scan tool to command the actuator and read live EBCM data, along with a digital multimeter to perform precise voltage drop and resistance testing on the actuator circuit. Because this system is directly tied to the vehicle’s parking and service brake functionality, incorrect diagnosis or repair carries significant safety liability, and a module reset/calibration is often required after the repair.
🛠️ Resolution Steps
- Step 1: Preliminary Inspection
Begin by visually inspecting the right rear brake caliper and the wiring harness that runs along the trailing arm or frame rail leading to the actuator motor. Look for signs of chafing, corrosion at the connector pins, melted insulation, or pinched wiring caused by suspension travel. Confirm the actuator connector is fully seated and free of moisture intrusion. - Step 2: Diagnostic Verification
Using a scan tool, pull up live data for the Right Park Brake Actuator circuit voltage while attempting to cycle the park brake. Back-probe the actuator connector with a digital multimeter to measure voltage on the control circuit with the key on; a reading consistently near battery voltage when the circuit should be at zero or a lower commanded voltage confirms a short-to-power condition. Also check for continuity to ground on the return circuit to rule out an open ground fault. - Step 3: Resolution & Reset Process
If wiring damage is found, repair or replace the damaged harness section using proper weather-sealed splices and loom protection. If the wiring and connectors test correctly but the fault persists, the right actuator motor assembly itself will need to be replaced as the internal driver circuit has likely failed. After the repair, use the scan tool to perform the required EPB calibration/relearn procedure and clear the stored code, then cycle the park brake several times to confirm proper operation and verify the fault does not return.
📦 Parts, Labor, and Budget Estimates
- Required Components/Software: Right Park Brake Actuator Motor Assembly, Wiring Harness Repair Kit (connectors/terminals), Bi-Directional Scan Tool with EPB calibration capability
- Average Component Price: $90 – $250 USD
- Estimated Labor Hours: 1.5 – 2.5 hours
- Total Estimated Budget: $220 – $500 USD