DTC P0700: Transmission Control Module (TCM) Requested MIL Illumination
Which one of these transmissions does your Malibu have ?
Automatic Transmission - 4T45-E
Automatic Transmission - 6T40/6T45
Automatic Transmission - 6T70/6T75
Do you know how to find out look at the VIN # ?
DTC P0716: Input Speed Sensor Performance
DTC P0717: Input Speed Sensor Circuit Low Voltage
The automatic transmission input speed sensor (ISS) is a permanent magnet with a coil of wire wound around. The ISS mounts in the case cover facing the reluctor wheel of the input shaft. As the reluctor wheel is driven by the turbine shaft, an AC signal is induced in the input speed sensor. Higher vehicle speeds induce a higher frequency and voltage at the sensor. There is a fixed air gap between the sensor and the teeth on the sensor reluctor wheel. The ISS input is used by the transmission control module (TCM) in order to control line pressure, torque converter clutch (TCC) apply and release, and transmission shift patterns. This sensor is also used to calculate the appropriate gear ratios and TCC slippage. This diagnostic indicates stuck, erratic, or intermittent conditions in the system.
Diagnostic Aids
• Road test the vehicle while monitoring the Transmission ISS parameter on the scan tool. The Transmission ISS parameter should vary with engine speed changes and not abruptly drop out.
• Inspect for an open or shorted AT ISS wire.
• Inspect for a disconnected AT ISS connector.
• Inspect for a faulty AT ISS.
Trouble Code P0717 Input speed sensor
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