P0726 means Engine Speed Input Circuit Range/Performance. The transmission module’s engine speed signal does not agree with what it expects from the other speed signals. It is a generic OBD-II code, so the definition is the same on any make, but the most likely cause varies by engine; confirm with a scan tool and the service information for your vehicle before buying parts.
What P0726 means
Electronically controlled automatics are run by a transmission control module (TCM), a separate box or part of the engine computer. It reads speed sensors, the range sensor and fluid temperature to decide when to shift, and drives solenoids that apply clutches and the torque converter clutch. Many basic code readers only show the generic P0700; a scan tool that reads the transmission module shows the specific fault. Check fluid level and condition first, since low or burnt fluid causes many transmission codes.
P0726 symptoms
- Erratic shifts
- Converter lockup problems
- Check engine light
Common causes of P0726
- Crankshaft position sensor signal problems
- Wiring or network faults between modules
- Transmission module fault
How to diagnose P0726
- Check for crank sensor codes
- Compare engine speed readings in the engine and transmission modules
- Check network wiring
Can you drive with P0726?
Usually yes, with shift problems.
P0726 tips
Because the engine speed signal starts at the crank sensor, fix any crank sensor code before replacing transmission parts.
Will P0726 clear itself?
If the fault stops, the computer turns off the check engine light by itself after several drive cycles without seeing it again, and the code stays in memory as history for a while. Clearing P0726 with a scan tool after a repair is fine, but if the cause is still there the code returns, sometimes within one drive. Disconnecting the battery also clears codes on most vehicles, but it erases learned fuel trims and idle settings as well.
Related codes
| Code | Meaning |
|---|---|
| P0335 | Crankshaft Position Sensor A Circuit |
| P0715 | Input/Turbine Speed Sensor A Circuit |
| P0700 | Transmission Control System Malfunction |
Guides that help
When it is more than a sensor
If the fault turns out to be internal (worn clutches, a failed converter or a damaged valve body), compare a rebuild with a replacement in transmission rebuild vs replacement and transmission replacement cost, identify your unit with what transmission do I have?, and browse our transmissions.
Shipping is a flat $80.00 per order to US addresses, with 15-day free returns. Questions? Ask a parts specialist.