Fault Family
System: Chassis (C-Codes)
4 SAE Codes
Brake Blending Valve Circuit
Diagnostic & Technical Explanation
Code C058F (Regeneration Torque Performance) sets when a hybrid or EV's brake module cannot achieve the commanded blend between regenerative and friction braking -- the separation valve that isolates the two circuits performs outside its expected range, is stuck closed, or the overall blending system, including delivered regeneration torque, falls short of the requested value. Physical causes include a sticking separation valve poppet, contaminated brake fluid affecting valve seating, or a regenerative torque request that the electric motor/inverter cannot fulfill due to a battery state-of-charge limit or motor fault. A blending fault commonly feels like an abrupt or grabby transition in pedal effort as the system switches between regen and friction braking.
These 4 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 4 times.
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)