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 MANUALSCHEVROLET2013CORVETTE BASE, 2D CONVERTIBLE, STANDARD TRANS, TRANS MFR CD 6L85M/MM6REPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 176 (AUTOMATIC TRANSMISSION - 4L60-E/4L65-E/4L70-E - DTC P0218 TO DTC P2771)DTC P0973, P0976, OR P2764CIRCUIT/SYSTEM TESTING
2013 Chevrolet Corvette Base, 2D Convertible, Standard Trans, Trans Mfr CD 6L85M/MM6
Circuit/System Testing
2013 Chevrolet Corvette Base, 2D Convertible, Standard Trans, Trans Mfr CD 6L85M/MM6SECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the TRANS fuse for an open.
- If the fuse is open, test the ignition 1 voltage circuit and the affected control circuit for a short to ground between the Fuse Block-Underhood and the AT inline 20-way connector.
- Disconnect the AT inline 20-way connector. Connect the J 44152
jumper harness (20 Pins), to the engine side of the connector. See Special Tools
. Using the J 35616
GM-approved terminal test kit, connect a test lamp between the ignition 1 voltage circuit and the affected control circuit. Turn ON the ignition with the engine OFF. Using the scan tool output controls command the affected solenoid ON and OFF. The test lamp should blink ON and OFF as commanded.
- If the test lamp is always OFF, test the circuits for an open.
- Connect the J 44152
to the transmission side of the connector. See Special Tools
. Using the J 35616
, measure the resistance between the ignition 1 voltage circuit and the affected control circuit. Resistance should be between 19-31 ohms for the 1-2 SS and the 2-3 SS. Resistance should be between 10-15 ohms for the TCC PWM solenoid valve.
- If resistance is greater than the specified range, test the circuits for an open. If the resistance is less than the specified range, test for a faulty solenoid or a shorted together condition.
- Measure the resistance between the ignition 1 voltage circuit and the transmission case. The resistance should be greater than 250K ohms.
- If the resistance is less than 250K ohms, test the ignition 1 voltage circuit for a short to ground.
- Measure the resistance between the affected control circuit and ground. The resistance should be less than 250K ohms.
- If the resistance is greater than 250K ohms, test the affected control circuit for a short to ground.
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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.