6T70 / 6T75 Automatic Transmission
DTC P0716 or P0717
Diagnostic Instructions
^ Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
^ Review Strategy Based Diagnosis for an overview of the diagnostic approach.
^ Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0716
- Input Speed Sensor Performance
DTC P0717
- Input Speed Sensor Circuit Low Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The input speed sensor (ISS) is a hall-effect type sensor. The ISS mounts to the control valve upper body assembly and connects to the control solenoid (w/body and TCM) valve assembly through a wire harness and connector. The sensor faces the 1-2-3-4 and 3-5-R clutch housing machined teeth surface. The sensor receives 8.3-9.3 volts on the input/output speed sensor (ISS/OSS) Supply Voltage circuit from the transmission control module (TCM). As the 1-2-3-4 and 3-5-R clutch housing rotates, the sensor produces a signal frequency based on the machined surface of the 1-2-3-4 and 3-5-R clutch housing. This signal is transmitted through the ISS signal circuit to the control solenoid (w/body and TCM) valve assembly. the control solenoid (w/body and TCM) valve assembly uses the ISS signal to determine line pressure, transmission shift patterns, torque converter clutch (TCC) slip speed and gear ratio.
Conditions for Running the DTC
DTC P0716
^ No ISS DTC P0717.
^ No OSS DTCs P0722 or P0723.
^ The engine speed is greater than 500 RPM for 5 seconds.
^ The ignition voltage is between 8.6 volts and 19.0 volts.
^ DTC P0716 has not passed this ignition cycle.
DTC P0717
^ No OSS DTCs P0722 or P0723.
^ The engine speed is greater than 500 RPM for 5 seconds.
^ The ignition voltage is between 8.6 volts and 19.0 volts.
^ The vehicle speed is greater than 16 km/h (10 mph).
^ The engine torque is greater than 50 N.m (37 lb ft).
^ DTC P0717 has not passed this ignition cycle.
Conditions for Setting the DTC
DTC P0716
^ The TCM detects an unrealistic drop in input shaft speed.
^ Transmission input speed is 1,050 RPM or greater for 2 seconds.
^ Transmission input speed drops 1,000 RPM for greater than 0.8 seconds and does not recover.
DTC P0717
Transmission input shaft speed is less than 100 RPM for 4.5 seconds when output speed is detected.
Action Taken When the DTC Sets
^ P0716 and P0717 are Type A DTCs.
^ The TCM freezes transmission adaptive functions.
^ The TCM turns OFF all solenoids.
Conditions for Clearing the DTC
P0716 and P0717 are Type A DTCs.
Diagnostic Aids
Inspect the ISS, harness, connector, and control solenoid (w/body and TCM) valve assembly pins for metallic debris and the 1-2-3-4 and 3-5-R clutch housing machined teeth surface for damage or misalignment. Proper torque of the OSS mounting bolt is critical to proper OSS operation. Use the J 35616 GM-approved terminal test kit for any test that requires probing the control solenoid (w/body and TCM) valve assembly harness connector or a component harness connector.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
^ Automatic Transmission Inline 20-Way Connector End View
^ Automatic Transmission Internal Connector End Views
^ Automatic Transmission Related Connector End Views
DTC Type Reference
^ Diagnostic Trouble Code (DTC) Type Definitions
^ Diagnostic Trouble Code (DTC) List/Type
Electrical Information Reference
^ Circuit Testing
^ Connector Repairs
^ Testing for Intermittent Conditions and Poor Connections
^ Wiring Repairs
Scan Tool Reference
^ Scan Tool Output Controls
^ Scan Tool Data List
^ Scan Tool Data Definitions
Special Tools Required
J 35616 GM-Approved Terminal Test Kit
Circuit/System Verification
Start the engine in Park and observe the transmission ISS on the scan tool while varying the engine speed. The transmission ISS should vary with the engine speed and not drop out.
Circuit/System Testing
1. With the ignition ON, observe the transmission ISS/OSS supply voltage circuit status on the scan tool, the parameter should display OK.
- If the circuit status does not display OK, disconnect the ISS/OSS connector from the control solenoid (w/body and TCM) valve assembly and recheck the scan tool display.
- If the transmission ISS/OSS supply voltage circuit status still displays OK, visually inspect the ISS, harness, connector, the control solenoid (w/body and TCM) valve assembly pins for metallic debris and 1-2-3-4 and 3-5-R clutch housing machined teeth surface for damage or misalignment. Repair or replace any damaged components.
2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test. Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test The scan tool should display Transmission ISS between 100-400 RPM.
- If 100-400 RPM ISS RPM is displayed, replace the ISS/OSS assembly.
- If no ISS RPM is displayed or the RPM is out of range, replace the control solenoid (w/body and TCM) valve assembly.
Component Testing
Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test. Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
^ Perform the Input Speed Sensor Replacement
^ Perform the Output Speed Sensor Replacement
^ Control solenoid (w/body and TCM) valve assembly - refer to Control Module References for replacement, setup, and programming. Programming and Relearning
^ Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection. Control Solenoid Valve and Transmission Control Module Assembly Inspection
^ Perform the Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test. Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test
^ Perform the Service Fast Learn Adapts. Programming and Relearning