P0725: Engine Speed Input Circuit

The transmission module needs engine speed for converter slip, shift quality and to check the turbine speed. Today it almost always arrives over CAN from the engine module with a validity flag; only GM's 2007 Allison 1000 tables show a separate engine speed sensor read by the transmission module. P0725 is the general fault of this input; with CAN it means the engine module marks its speed value as invalid. Saab's Aisin transmissions and a 2006 GM table set it after about 4 s, the GM table with immediate MIL. A Saab bulletin notes that behind P0725 there is always a crankshaft or camshaft sensor code in the engine module (P0016, P0335–P0339) – so read the engine module first. Limp mode follows; a completely missing CAN message is U0100.

Symptoms

• Transmission warning lamp, possibly check engine light
• Torque converter clutch locked out
• Harsh shifts or limp mode
• Often an engine code (crankshaft sensor) as well

Most likely causes

• Crankshaft or camshaft sensor fault in the engine module (speed invalid there)
• CAN fault between engine and transmission module (wiring, termination, connector)
• Engine module software or fault
• Transmission module faulty

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the connector and look for metal filings on the sensor
2. See whether there is an RPM signal while cranking
3. Measure the signal with an oscilloscope if you can
4. Check the engine timing before replacing expensive parts

Good to know

• Repair difficulty: medium
• It can trigger limp mode.
• It affects emissions.

What each character of P0725 means

• P: Powertrain: engine and transmission
• 0: Generic code: same on every make
• 7: Transmission
• 25: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0725?

Avoid driving: the engine can stall while moving. If the timing is off, continuing can cause serious damage.

What causes code P0725?

The most common causes are: crankshaft or camshaft sensor fault in the engine module (speed invalid there); cAN fault between engine and transmission module (wiring, termination, connector); engine module software or fault.

Related codes

• P0726Engine Speed Input Circuit Range/Performance
• P0727Engine Speed Input Circuit No Signal
• P0728Engine Speed Input Circuit Intermittent
• P0335Crankshaft Position Sensor A Circuit
• U0100Lost Communication with ECM/PCM "A"

Sources

• saabwisonline.com: p0725
• saabwisonline.com: 03 01 440 fault reason code p0725 71 in tcm not in
• gsi.ext.gm.com: 2006trans7
• law.cornell.edu: 13 CCR 1968.2

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.