Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2020ACADIA SLE, 2.5L ENG VIN AREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 12 (AUTOMATIC TRANSMISSION - 6T50 (M2D) - DIAGNOSTIC INFORMATION AND PROCEDURES)DIAGNOSTIC INFORMATION AND PROCEDURESCONTROL SOLENOID VALVE AND TRANSMISSION CONTROL MODULE ASSEMBLY INPUT SHAFT SPEED/OUTPUT SHAFT SPEED INPUT TEST
2020 GMC Acadia SLE, 2.5L Eng VIN A
Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test
2020 GMC Acadia SLE, 2.5L Eng VIN ASECTION Control Solenoid Valve and Transmission Control Module Assembly Input Shaft Speed/Output Shaft Speed Input Test
WARNING: This page is about a different car, the 2019 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
Special Tools
- EL 35616 GM-Approved Terminal Test Kit
- EL 38522 Variable Signal Generator
For equivalent regional tools, refer to Special Tools .
The purpose of this test is to provide a simulated input/output speed sensor (ISS/OSS) signal to the control solenoid valve assembly ISS/OSS input circuits.
Transmission Input Speed Sensor
- Ignition OFF, disconnect the ISS wiring harness connector X3 (1) from the control solenoid valve assembly.
- Ignition ON, test for 11 - 14 volts at terminal B.
- If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
- Ignition OFF, using the EL 35616 terminal test kit, connect the EL 38522 variable signal generator red lead to the ISS signal circuit terminal A on the TCM.
- Connect the black lead from the EL 38522 variable signal generator to ground.
- Set the EL 38522 variable signal generator to 5 volts, the frequency to 300 Hz, and the percent duty cycle to 50 or the normal position.
- Ignition ON, verify with a scan tool the Transmission ISS parameter is between 495 - 505 RPM.
- If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
Transmission Output Speed Sensor
- Ignition OFF, disconnect the OSS wiring harness connector X4 (2) from the control solenoid valve assembly.
- Ignition ON, test for 11 - 14 volts at terminal B.
- If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
- Ignition OFF, using the EL 35616 terminal test kit, connect the EL 38522 variable signal generator red lead to the OSS signal circuit terminal A on the TCM.
- Connect the black lead from the EL 38522 variable signal generator to ground.
- Set the EL 38522 variable signal generator to 5 volts, the frequency to 300 Hz, and the percent duty cycle to 50 or the normal position.
- Ignition ON, verify with a scan tool the Transmission OSS parameter is between 745 - 825 RPM.
- If not within the specified range, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.