Transmission · Powertrain · generic (SAE-defined)
P0725: Engine Speed Input Circuit
P0725 means the transmission control module is not receiving a valid engine speed (RPM) signal, which it needs to manage shifts and torque converter lockup.
Standard title per SAE J2012 / ISO 15031-6 · Updated 2026-11-07 · By CarWhere Research
How P0725 sets
The transmission control module (TCM) receives engine speed either from a direct wire from the engine computer or crankshaft sensor, or as a message over the data network. If that signal is missing, erratic or implausible while the engine is running, the TCM sets P0725. How the signal is delivered and judged is manufacturer-specific.
Common causes of P0725
Roughly most likely first; the actual cause depends on the vehicle and needs testing to confirm.
- Faulty crankshaft position sensor or its wiring
- Open or shorted engine speed signal wire to the TCM
- Data network communication problem between the PCM and TCM
- Poor TCM or PCM ground
- Ignition system interference on some older designs
- TCM or PCM fault
P0725 symptoms
- Check engine light on
- Harsh or delayed shifts
- Torque converter clutch not engaging
- Tachometer erratic or not working on some vehicles
- Stalling or no-start if the crankshaft sensor is the cause
How P0725 is diagnosed
- Record freeze frame and check all modules for crankshaft sensor and network codes
- Compare engine speed in the engine computer data with the value seen by the TCM
- Inspect the crankshaft sensor wiring and connector
- Check the engine speed signal circuit or network wiring to the TCM
- Verify TCM and PCM power and ground circuits
- Check for software updates if wiring and sensors test good
Typical fixes for P0725
- Replace the crankshaft position sensor if faulty
- Repair the engine speed signal wire or network wiring
- Repair TCM or PCM grounds
- Update or replace the TCM
Replace parts only after testing confirms the cause — a code names the circuit or condition that failed a check, not necessarily the faulty part. We don’t publish per-repair prices; for what households actually spend on upkeep, see car repair costs.
Related codes & warning lights
P0725 FAQ
What does code P0725 mean?
P0725 means the transmission control module is not receiving a valid engine speed (RPM) signal, which it needs to manage shifts and torque converter lockup. The standard definition is "Engine Speed Input Circuit."
Can I drive with a P0725 code?
Often possible for short trips, but shifting may be harsh or the transmission may limit gears. If the engine also stalls or runs poorly, stop driving and have it checked.
Why does the transmission need engine speed?
Engine speed lets the transmission computer calculate torque converter slip and time shifts properly. Without it, the computer uses conservative default shift strategies.
Can a crankshaft sensor problem cause P0725?
Yes, on many vehicles the engine speed signal starts at the crankshaft sensor, so a failing sensor can trigger both engine and transmission codes.
Keep researching
More transmission codes
Sources
- SAE J2012 — Diagnostic Trouble Code Definitions (standard code titles)
- ISO 15031-6 — Road vehicles: communication between vehicle and external equipment for emissions-related diagnostics, Part 6: Diagnostic trouble code definitions
- U.S. EPA — Vehicle Emissions Inspection and Maintenance (I/M) programs
- U.S. EPA, 40 CFR 86.1806-17 — Federal onboard diagnostics requirements for light-duty vehicles
General information written by CarWhere Research, not a diagnosis of your vehicle. Manufacturers can add their own sub-definitions and test conditions; confirm with the factory service information for your year, make and model. Before paying for a repair, check NHTSA for open recalls and your warranty booklet: federal law requires an emissions warranty on major emission-control parts such as the catalytic converter and engine computer.