Fault Family System: Chassis (C-Codes) 16 SAE Codes

Electric Park Brake Actuator Circuit

Diagnostic & Technical Explanation

Code C0609 (Park Brake Switch Circuit) sets when the park brake control module cannot verify correct operation of the electric park brake -- the dash switch reports an implausible or stuck state, a corner actuator's control circuit is open, shorted, or out of range, the actuator is mechanically stuck engaged or disengaged, or the control module's own driver circuit fails. Because the actuators clamp the rear calipers directly with a small motor and gear set, seized actuator gears from corrosion, a worn motor, or a corroded connector at the caliper are the common physical causes. Given this system holds the vehicle stationary, treat a stuck-on or stuck-off actuator as a safety-relevant repair and confirm the mechanical park brake will hold before returning the vehicle to the customer.

These 16 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 16 times.

Codes in this family (16)

Code	Definition	Repair coverage
C0609	Park Brake Switch Circuit	4 ranked fixes
C060A	Park Brake Switch Stuck	4 ranked fixes
C060B	Left Park Brake Actuator Control Circuit/Open	4 ranked fixes
C060C	Left Park Brake Actuator Control Circuit Low	4 ranked fixes
C060D	Left Park Brake Actuator Control Circuit High	4 ranked fixes
C060E	Left Park Brake Actuator Performance/Stuck Off	4 ranked fixes
C060F	Left Park Brake Actuator Stuck On	4 ranked fixes
C0610	Right Park Brake Actuator Control Circuit/Open	4 ranked fixes
C0611	Right Park Brake Actuator Control Circuit Low	4 ranked fixes
C0612	Right Park Brake Actuator Control Circuit High	4 ranked fixes
C0613	Right Park Brake Actuator Performance/Stuck Off	4 ranked fixes
C0614	Right Park Brake Actuator Stuck On	4 ranked fixes
C0615	Park Brake Control Module Control Circuit/Open	4 ranked fixes
C0616	Park Brake Control Module Control Circuit Performance	4 ranked fixes
C0617	Park Brake Control Module Control Circuit Low	4 ranked fixes
C0618	Park Brake Control Module Control Circuit High	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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