The position sensor or switch of transmission range control channel A reports a circuit range/performance condition. The TCM cannot verify the actuator position reliably.
Medium severity. Can I keep driving?Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Most likely causes
- Dirty or oxidised switch contacts
- Sensor mounting misadjusted
- Sensor element aged beyond calibration window
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
What each character of P27EC means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- 7: Transmission
- EC: Specific fault in that system
Frequently asked questions
Can I keep driving with code P27EC?
Drive gently to a repair shop. If it slips, you hear clunks, or it loses its gears, do not keep driving.
What causes code P27EC?
The most common causes are: dirty or oxidised switch contacts; sensor mounting misadjusted; sensor element aged beyond calibration window.
Related codes
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.