Fault Family
System: Chassis (C-Codes)
1 SAE Codes
Brake Shift Interlock Circuit
Diagnostic & Technical Explanation
Code C05D7 (Brake Transmission Shift Interlock (BTSI) Control Circuit) sets when the module cannot drive or verify the brake-transmission shift interlock solenoid that mechanically locks the shifter in Park until the brake pedal is applied. Because the solenoid is a simple electromechanical lock rather than a sensor, the usual causes are an open or shorted solenoid coil, a corroded connector at the shifter assembly, or the interlock's own micro-switch failing to confirm brake application. A stuck-locked shifter after a battery jump-start or brake-light fuse failure is a very common real-world trigger for this code and is worth ruling out before replacing parts.
These 1 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 1 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)