OBD codes / P0725
P0725
ModerateEngine Speed Input Circuit Malfunction
P0725 is generally drivable — the engine runs normally and the transmission still shifts, just less gracefully. Get it diagnosed at your convenience, and sooner if shifting turns harsh, since sloppy shift timing adds wear over time.
What this code means
The transmission computer needs its own copy of engine RPM — it compares engine speed to input-shaft speed to measure torque-converter slip and time its shifts smoothly. P0725 means that engine-speed signal, as received by the transmission side, is missing or unreliable. Importantly, the engine itself usually runs fine: the tachometer may even work normally, because the fault is often in the wiring or communication path between the engine computer and the transmission computer, or occasionally the crankshaft position sensor signal feeding it. Symptoms can be surprisingly subtle — sometimes just the light — or show up as clunky shifts and torque-converter lockup that hunts or never engages. It's one of the gentler transmission codes, but it degrades shift quality and can mask converter problems while it's active.
Symptoms you might notice
- Harsh or poorly timed shifts
- Torque-converter lockup hunting, or not engaging
- Sometimes no noticeable symptom beyond the light
- Check-engine light
What it costs to fix
Typical range: $50–$400 · about ~0.5–2 hrs of labor
| If the cause is… | Part | Labor |
|---|---|---|
| Wiring / connector / ground repair | $10–$120 | ~0.5–2 hrs |
| Crankshaft position sensor | $20–$100 | ~0.5–2 hrs |
This is mostly a diagnosis-and-wiring code — the parts involved are cheap when a part is needed at all. Labor depends on how hard the fault is to trace; intermittent wiring issues take longer to pin down than a failed sensor.
The price swings on which cause it turns out to be — so confirm the cause before paying. Diagnose P0725 for my exact vehicle →
Frequently asked
Why does the transmission need to know engine speed?
It compares engine RPM to its own input-shaft RPM to measure how much the torque converter is slipping, which drives lockup control and shift timing. Without that comparison, the transmission is shifting partly blind — functional, but clumsier.
My tachometer works fine — how can the engine speed signal be bad?
The tach and the transmission can be fed by different paths. P0725 means the transmission side isn't receiving a good signal, which is frequently a wiring or inter-module communication fault rather than the engine's sensor itself failing.
Does P0725 mean my crank sensor is failing?
Not necessarily. The crankshaft position sensor is one possible source, but wiring, connectors, and grounds between the modules are just as common. If the crank sensor were truly failing, you'd often see engine-side codes or stalling alongside this one.
Can I keep driving with P0725?
Yes, in most cases — it's a low-drama code. Watch for harsh shifting or converter shudder developing, and get it diagnosed rather than letting it linger indefinitely, since it also blinds some of the transmission's self-monitoring.
Seeing P0725 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0725 for my vehicleRelated trouble codes
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Generic OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.