C05D7 code meaning
Brake Transmission Shift Interlock (BTSI) Control Circuit
What C05D7 means
Covers the output that drives the brake transmission shift interlock, the solenoid that keeps the selector in park until the brake pedal is pressed. In the US, FMVSS 114 has required this lock since 1 September 2010 on vehicles up to 4,536 kg fitted with an automatic gearbox and a park position. A patent by Pontiac Coil shows the usual layout: a spring holds a blocking pin in the locked position, and a transistor energizes the coil only with ignition on and brake switch closed, so the system fails locked. The code points to the driver stage, wiring or coil. No manufacturer publishes C05D7; Ram logs P0928-00 for an internal BTSI fault in its rotary shifter. P081F is the signal correlation counterpart.
C05D7 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C05D7
- Selector cannot be moved out of park despite pressing the brake
- Selector leaves park without the brake applied
- No clicking of the interlock when the brake is pressed
Common causes of C05D7
- Most likelyInterlock solenoid coil open or shorted
- PossibleDamaged wiring or corroded connector at the shifter
- PossibleDriver stage in the shifter or body module faulty
- Less likelyBrake light switch signal missing, so the lock is never released
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Btsi solenoid
What each part of C05D7 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| D7 | The exact fault in that area. |
What to do next
- Note C05D7 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C05D7
What does C05D7 mean?
C05D7 means "Brake Transmission Shift Interlock (BTSI) Control Circuit". Covers the output that drives the brake transmission shift interlock, the solenoid that keeps the selector in park until the brake pedal is pressed. It is a generic code, so it means the same on every make.
Is it safe to drive with C05D7?
C05D7 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will C05D7 fail an emissions test?
C05D7 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C05D7 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C05D7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.