P0725 Code - Engine Speed Sensor Input Circuit Malfunction

What does P0725 Mean?

The PCM has received an engine speed signal from the engine (turbine) speed input sensor that is either irrational, erratic, or in some way incorrect. Without a usable input speed signal the transmission cannot provide a proper shift strategy.

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What are the common causes of P0725 ?

The most common problems that result in the P0725 code are a malfunctioning engine input speed sensor, and a faulty transmission output speed sensor. However, many other things can trigger the P0725 code, including:

• Corroded, damaged, or shorting wires
• Loose connectors
• Dirty or insufficient transmission fluid
• Malfunctioning engine drivability sensors
• Faulty shift solenoids
• In rare cases, a malfunctioning PCM

How do you troubleshoot P0725 ?

The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0725 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired.

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