P0726 — Engine Speed Input Circuit Malfunction
Drive with caution — fix soon.
What P0726 means
This code means the transmission control module detected a malfunction in the engine speed input circuit, so it isn't getting a reliable RPM signal to coordinate gear shifts. It's commonly caused by a faulty crankshaft position or input speed sensor, wiring problems, or a communication fault between the engine and transmission modules. Repairs usually start with testing and replacing the suspect sensor, and it's often fixable without major transmission work.
Common symptoms
- Check engine light is on
- Harsh or erratic gear shifts
- Delayed or poorly timed shifting
- Transmission may enter limp mode
- Reduced fuel economy
Common causes
- Weak or failing crankshaft position or input speed sensor
- Damaged or corroded wiring or connectors
- Worn reluctor or tone ring
- Low or contaminated transmission fluid
- Failing transmission control module
Typical repair cost
$150 – $500
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0726 code?
Usually yes for a while, but you may feel rough or delayed shifts. Get it checked soon to keep the problem from worsening and to avoid limp mode.
How much does it cost to fix a P0726 code?
Most repairs fall between $150 and $500, depending on the sensor involved and any wiring work. Transmission control module issues can raise the cost.
Is a P0726 code serious?
It's moderately serious. It affects shift timing and can cause limp mode, but it usually isn't an immediate safety risk if you have it addressed promptly.
What sensor causes a P0726 code?
It's typically tied to the engine speed signal, which often comes from the crankshaft position sensor or an input speed sensor that the transmission relies on to time shifts.