P0727 - ENGINE SPEED INPUT CIRCUIT NO SIGNAL

When the DTC P0727 OBDII code is stored, it is because the PCM (Powertrain Control Module) has received a signal from the Engine Speed Input Sensor (ISS), which is incorrect or unreasonable.

If this input speed signal is not trusting, the vehicle transmission will not be able to deliver an efficient shift strategy.

Most PCMs are programmed to anticipate engine speeds gradually increasing until a shift point is reached. But if the input speed does not increase or the PCM receives no signal, this code will be stored.

• Check Engine light ON.
• Vehicle shifts are abrupt or may not allow any shifts at all.
• Loss of fuel economy.
• The speedometer does not work properly.
• Motor hesitation.

Reasons to set the P0727 OBD2 fault code:

• Circuit wiring or connectors may be corroded or shorted in the circuit.
• A shift solenoid may be faulty.
• The valve body may be defective.
• There could be elements in the transmission fluid that cause pollution in the transmission fluid.

To troubleshoot problems related to the P0727 OBDII error code, follow these steps:

• Inspect the cables and electrical components related to the system. If you find some cables in bad condition or there is oil in the connectors, you should repair or replace them.
• Verify that the transmission fluid is at the required level and the condition of the fluid is appropriate.
• Test the Motor Input Speed Sensor with a digital multimeter on the ohm scale, If it does not meet specifications, you should replace it.
• Change the Transmission Output Speed Sensor.
• Replace the shift solenoid.