P0727 Code: Engine Speed Input Circuit No Signal
🟠 Moderate severity · drivable
You can drive, but the transmission may not shift properly and could go into fail-safe mode until the signal is restored.
What P0727 means
The transmission computer is getting no engine RPM signal at all. This usually means a failed crankshaft position sensor, an open wire, or a bad connector. Without engine speed, the transmission can't time shifts and often goes into a fail-safe mode.
Symptoms
- Check engine light is on
- Transmission won't shift or shifts very late
- Transmission goes into fail-safe (limp) mode
- Engine may stall or run poorly
Common causes
- most common: Faulty crankshaft position sensor
- common: Open wiring in the signal circuit
- common: Loose or corroded connector
- less common: Faulty sensor mounting or damaged tone ring
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Inspect the crankshaft sensor connector and wiring | Yes | $20–60 |
| Replace the crankshaft position sensor | Yes | $50–150 |
| Repair open or damaged wiring | Mechanic | $100–300 |
Frequently asked questions
Can I drive with a P0727 code?
Yes, but the transmission may shift very late or refuse to shift. If it goes into fail-safe mode, get it diagnosed before driving far.
What does no signal mean in P0727?
It means the transmission computer isn't receiving any engine RPM reading at all. A failed crankshaft sensor or broken wire is the usual cause.
How much does it cost to fix a P0727?
A crankshaft position sensor replacement usually costs $50–$150 for parts plus labor. Wiring repairs are typically $100–$300.
Related codes
P0725
P0725 Code: Engine Speed Input Circuit
P0726P0726 Code: Engine Speed Input Circuit Range/Performance
P0335P0335 Code: Crankshaft Position Sensor Circuit Malfunction
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.