Transmission

P0725 — Engine Speed Input Circuit (Transmission)

Severity: medium Drive with care, to a shop

What P0725 means

The transmission control module (TCM) uses engine speed to time shifts, control torque converter lockup, and manage line pressure. The signal comes from the crankshaft or camshaft sensor, usually through the engine computer and often over the CAN bus. If the signal is missing, erratic, or disagrees with other data, the TCM sets P0725.

Symptoms

  • Transmission will not shift or stays in one gear
  • Limp mode
  • Engine stalls or stumbles when shifting
  • Check Engine or transmission warning light on
  • Erratic or dead tachometer
  • Harsh or delayed shifts

Possible causes

  1. Failed crankshaft position (CKP) sensor
  2. Camshaft sensor fault
  3. Open, corroded, or shorted wiring between the ECM and TCM
  4. CAN bus communication problem
  5. Outdated or faulty TCM/ECM software
  6. Failed ECM/PCM or TCM
  7. Poor ground or power supply to the modules

How to diagnose

  1. Scan all modules for codes and save freeze frame data
  2. Look for CAN communication (U) codes and crankshaft sensor codes
  3. Compare RPM on the scan tool from the TCM and the ECM while cranking and running
  4. Inspect connectors and harness at the crank sensor and TCM for moisture, corrosion, and damage
  5. Test the crank sensor resistance or signal pattern with a scope
  6. Check signal, power, and ground wires between modules for continuity
  7. Check the CAN bus: resistance between CAN-H and CAN-L should be about 60 ohms
  8. Check for software updates and technical service bulletins

Common fixes

  • Replace the crankshaft or camshaft sensor
  • Repair wiring and connectors, restore grounds
  • Fix the CAN bus fault
  • Update or reflash TCM/ECM software
  • Repair or replace the TCM or ECM once testing confirms it

P0725 on different brands

Ford · manuals
On Ford, P0725:48 appears in the 2024-2025 gasoline-engine OBD monitor strategy as an internal control module engine speed performance condition; it identifies the detected monitor condition, not a confirmed failed part.

Questions and answers

What does P0725 mean?

The transmission control module is not receiving a valid engine speed signal. The cause can be a sensor, wiring, CAN communication, or a control module.

Can I drive with P0725?

Only briefly and carefully, such as to a repair shop. The transmission may enter limp mode and the engine may stall during shifts.

How much does it cost to fix P0725?

It depends on the cause. A sensor is usually cheaper than a wiring repair or a module replacement, so proper diagnosis comes first.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.