4T65EV Transmission
Slipping or not engaged
Checking the diagnostic trouble codes (DTCs)
- Ignition on
- Read off diagnostic trouble codes (DTCs).
If any other diagnostic trouble codes (DTCs) than TCM-002F are stored, these must be fault-traced and remedied after this fault-tracing is completed.
Continue - Check the quality of the transmission oil
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Check the quality of the transmission oil
Note! The transmission fluid quality is extremely important for transmission function. Therefore it is imperative that this is correct.
- Ignition off.
Check the transmission oil quality. Take a sample using the dip stick.
- Replace the transmission fluid if it smells burnt
- Replace the fluid and filter if the transmission fluid contains particles
- Check if there is oil or an oil film in the expansion tank. Oil in the expansion tank indicates leakage from the transmission oil cooler which is positioned in the cooler unit.
Note! The transmission oil is red and must not be confused with black engine oil.
- If the transmission fluid is cloudy or pink, it is contaminated with coolant. In such cases the transmission must be replaced. For checking coolant in transmission oil, see: Checking for coolant in the oil, AW55-50/51SN, AW50/51 AWD, 4T65EV-GT Checking For Coolant In the Oil
When replacing the transmission, the cooler unit, including the additional cooler must be replaced if installed. Replace the hoses between the cooler and the transmission.
Other information:
- To replace the transmission fluid and filter, see Gearbox fluid, replacing Removal and Replacement.
Select an option:
1. The fluid contains water
2. The fluid smells burnt or contains particles
3. No fault detected.
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WATER - Replacing automatic transmissions
BURNT - Replacing automatic transmissions
NO FAULT - Checking the oil level in the transmission
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Checking the oil level in the transmission
Checking the oil level in the transmission
Check the transmission oil level
Note! The transmission fluid level is extremely important for transmission function. Therefore it is imperative that it is correct. In addition the oil level is dependent on oil temperature.
- Start the car
- Read off the oil temperature.
When checking the transmission fluid level, the temperature must be 80-90°C.
At the correct temperature, the oil level should be between "Min hot" and "Max hot".
Oil level
- Too high:Drain the transmission fluid to the correct level
- Too low:Check the transmission for leakage.
Remedy as necessary.
Other information:
- To check and adjust the oil level, see Oil level, checking Checking Oil Level.
Was the transmission fluid level correct?
OK - Erasing diagnostic trouble codes (DTCs)
NOT OK - Resetting the "Transmission fluid change" counter
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Resetting the "Transmission fluid change" counter
Hint: The transmission control module (TCM) has a counter for the oil quality. The counter counts up if the transmission is exposed to too high a load or an ambient temperature that is too high. If the counter is not reset when the oil is drained or changed, there is a risk that a diagnostic trouble code (DTC) will be stored in faulty circumstances. Therefore it is important that the "Transmission oil change" counter is reset.
Note! This applies only when the transmission fluid is changed and when the fluid is changed when repairs are carried out to the transmission temperature sensor.
- Ignition on.
Reset the counter by clicking on the VCT 2000 symbol.
Continue - Erasing diagnostic trouble codes (DTCs)
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Erasing diagnostic trouble codes (DTCs)
Hint: When diagnostic trouble codes (DTCs) are erased, the information stored at the same time as the DTC is also erased. Therefore it is suggested that the extended diagnostic trouble code (DTC) information (frozen values) is read off before the DTCs are erased. To read off extended fault-tracing information: save a bookmark, select cancel and go to VIDA vehicle communication.
- Ignition off
- Wait for two minutes to allow time for the diagnostic trouble codes (DTCs) to be stored in the control module memory
- Ignition on
- Erase diagnostic trouble codes (DTCs).
Continue - Checking the diagnostic number
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Checking the diagnostic number
Checking the software
Note! To carry out fault-tracing, the transmission control module (TCM) must be programmed with specific software.
- Ignition on
- Read off the control module diagnostic number.
Check the read off diagnostic number against the diagnostic numbers given in the center table.
If the diagnostic number is included in the table, the control module must be programmed with the latest software.
See the technical journal for information about the most recent software.
Continue - Connecting the T pipe
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Connecting the T pipe
- Deactivate the function for STC/DSTC by pressing the button for STC/DSTC for approximately 2 seconds
- Ignition off
- Connect T-pipe999 7002 Adapter automatic gearbox 4T65E 999 7002 Adapter Automatic Gearbox 4T65E with oil pressure gauge 999 5114 MANOMETER 10 KP 999 5114 Manometer 10 Kp to the coolant hose from the transmission for the oil cooler
- Raise the car so that the drive wheels are clear of the ground.
Warning! Ensure that the car safely raised. Ensure that there are no objects caught in the front wheels.
- Start the engine
- Gear selector in position P
- Activate the function "Block automatic shifting".
Other information
- To connect the T-pipe to the oil cooler for the transmission. See T-pipe, connecting to oil cooler .
Allow the engine to run. Select Continue.
Continue - Checking lock-up solenoid SL
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Checking lock-up solenoid SL
- Engine running
- Move the gear selector to position D
- Activate the solenoid for gear 2 and then the lock-up function
- Check the pressure change on the oil pressure gauge. A considerable change in pressure should be observed
- Deactivate the lock-up function. Check the pressure change.
Repeat the activation and deactivation of the lock-up function a few times to ensure accurate results.
Hint: Unchanged pressure means that the control system is defective.
Did the pressure change?
Yes - Checking the lock-up function
No - Replacing transmission control system
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Checking the lock-up function
- Engine running
- Raise the car so that the wheels can rotate freely
- Move the gear selector to position D
- Rev the engine to 2000 rpm
- Activate the solenoid for gear 2 and then the lock-up function
- Read off the input transmission speed and the engine speed.
Press the accelerator pedal (AP). Check the lock-up function by comparing the input speed of the transmission and the engine speed (RPM). The speeds should follow each other and be approximately the same. If the difference in speed is greater than 100 rpm the lock-up function is not functioning.
Is the difference in speed (RPM) greater than 100rpm?
Yes - Replacing automatic transmissions
No - Checking the resistance of solenoid SL
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Checking the resistance of solenoid SL
- Ignition off
- Connect the breakout box
- Connect adapter951 1505 Adapter 20 pin 951 1505 Adapter 20 Pin and breakout box981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to the transmission connector (transmission side).
Connect an ohmmeter between terminals E (#A5) and T (#A17).
The solenoid SL resistance must be between 11 and 15 ohms.
Other information:
- To connect the breakout box, see Connecting the breakout box, 4T65EV-GT Connecting the Breakout Box
- To connect the breakout box to the transmission connector, see Connecting the breakout box, GM automatic transmissions, 4T65EV-GT Connecting the Breakout Box, GM Automatic Transmissions
- For information about signals, see Signal specification, 4T65EV-GT Signal Specification
- Checking wiring and terminals Checking Wiring And Terminals
Was the resistance OK?
Yes - Test driving
No - Checking the wiring
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Test driving
Note! Test drive the car according to the driving schedule below to check whether the fault is still active. The test drive is compiled in order to create the conditions in which the diagnostic trouble code (DTC) will be stored again if the fault is active. The TEST MODE function can be used to provoke any diagnostic trouble codes (DTC). The function reduces the conditions for how quickly diagnostic trouble codes (DTCs) are stored in the control module and the test drive becomes easier.
- Start the engine
- Activate TEST MODE.
Note! Do not switch off the engine!
- Disconnect the VIDA station. Test drive the car as described below.
Warning! Please observe traffic regulations.
Note! Before test driving, the transmission should be at operating temperature, approximately 80-90 °C.
Shift the gear selector to position 3 (third gear with Geartronic). Carefully accelerate to 85 km/h. Maintain the same speed for a few seconds. Carefully accelerate for approximately 30 seconds to increase the engine torque.
Hint: The car must be driven at an engine speed where the lock-up function is normally fully activated and not slipping. The following gear positions and speeds are also possible:
- 120 km/h gear position D
- 85 km/h gear position 3.
Criteria for diagnostic trouble code (DTC):
- The transmission fluid temperature must exceed 30 °C
- No shifting during the evaluation period
- Positive engine torque (no engine braking)
- Gear selector in position D, 3 or 2 (4T65EV).
Gear selector in Geartronic position and gears 4, 3 or 2 (4T65EV-GT)
- Speed 85 km/h for at least 30 seconds.
Continue - Checking the diagnostic trouble codes (DTCs)
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Checking the diagnostic trouble codes (DTCs)
- Ignition on
- Read off diagnostic trouble codes (DTCs).
If any other diagnostic trouble codes (DTCs) than TCM-002F are stored, these must be fault-traced and remedied after this fault-tracing is completed.
Was diagnostic trouble code (DTC) TCM-002F stored?
Yes - Replacing automatic transmissions
No - Verification
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Replacing transmission control system
Replace the transmission control system according to Control system / valve housing, replacing .
Continue - Resetting adaptation
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Replacing automatic transmissions
Replacing a faulty transmission
Replacing a faulty transmission
- In the event of an internal fault in the transmission, replace the transmission. See Gearbox, removing Gearbox, Removing and Gearbox, installing Gearbox, Installing.
Continue - Resetting the adaptation and oil quality counter
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Resetting the adaptation and oil quality counter
Resetting the adaptation
Resetting adaptation and the counter for "Transmission oil change"
Hint: The transmission has torque controlled adaptive pressure control. Pressure control means that the transmission regulates the pressure itself during each gear shift. This avoids harsh gear shifting. Each gear shift is evaluated by the control module and stored in the memory. This allows for compensation for wear and tear in the transmission and clutch. It is important that the adaptation in the memory is reset after the transmission has been repaired. This is to ensure normal operation. The oil is replaced during repair; the "Transmission oil change" counter must be reset. If the counter is not reset when the fluid is drained and replaced, there is a risk that a diagnostic trouble code (DTC) will be stored in incorrect circumstances.
Note! This applies only if the transmission or one of the components in the transmission have been replaced.
- Ignition on.
Click on the VCT2000 symbol to reset the adaptation and counter.
Continue - Resetting adaptation
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Checking the wiring
Hint: 2 breakout boxes can be used to make fault-tracing easier.
- Ignition off
- Connect the breakout box
- Disconnect the control module.
- Disconnect the transmission connector
- Connect adapter951 1505 Adapter 20 pin 951 1505 Adapter 20 Pin and breakout box981 3190 Replaced by 9511428 981 3190 Replaced by 951 1428 to the transmission connector (transmission side).
Check the cable between control module terminal #51 (#A51) and transmission connector (control module side) terminal #T (#A17). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Check the cable between control module terminal #53 (#A53) and transmission connector (control module side) terminal #E (#A5). Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Hint: Also check all the other power supply cables in the circuit.
Remedy as necessary.
Other information:
- To connect the breakout box, see Connecting the breakout box, 4T65EV-GT Connecting the Breakout Box
- To connect the breakout box to the transmission connector, see Connecting the breakout box, GM automatic transmissions, 4T65EV-GT Connecting the Breakout Box, GM Automatic Transmissions
- For information about signals, see Signal specification, 4T65EV-GT Signal Specification
- Checking wiring and terminals Checking Wiring And Terminals
Was a fault detected?
Yes - Verification
No - Checking the circuit for solenoid SL
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Checking the circuit for solenoid SL
- Ignition off
- Open the transmission control system.
Check the cable between transmission connector terminal #T (#A17) and solenoid SL terminals #A and #E (#A5) and solenoid SL terminal #B. Check for a short-circuit to supply voltage.
Check all the cables in the wiring harness from the transmission connector to the transmission components. Check for a short-circuit to each other.
Hint: Check solenoid SL. Measure the solenoid resistance between terminals #A and #B. The resistance must be between 10 and 15 ohms.
Remedy as necessary.
Other information:
- To connect the breakout box to the transmission connector, see Connecting the breakout box, GM automatic transmissions, 4T65EV-GT Connecting the Breakout Box, GM Automatic Transmissions
- To open the transmission control system, see Side cover transmission, replacing Side Cover Transmission, Replacing
- To replace solenoid SL, see Solenoid lock-up function, replacing
- To replace the cable harness, see Wiring harness / oil temperature sensor, replacing Removal and Replacement
- For information about signals, see Signal specification, 4T65EV-GT Signal Specification
- Checking wiring and terminals Checking Wiring And Terminals
Continue - Resetting adaptation
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Verification
Checking diagnostic trouble codes (DTCs)
- Ignition on
- Read off diagnostic trouble codes (DTCs).
If any other diagnostic trouble codes (DTCs) than TCM-002F are stored, these must be fault-traced and remedied after this fault-tracing is completed.
Continue - Erasing diagnostic trouble codes (DTCs)
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Erasing diagnostic trouble codes (DTCs)
- Ignition off
- Wait for two minutes to allow time for the diagnostic trouble codes (DTCs) to be stored in the control module memory
- Ignition on
- Erase diagnostic trouble codes (DTCs).
Continue - Check the diagnostics number
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Check the diagnostics number
Checking the software
DONE - Test driving
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Test driving
Note! Test drive the car according to the driving schedule below to check whether the fault is still active. The test drive is compiled in order to create the conditions in which the diagnostic trouble code (DTC) will be stored again if the fault is active. The TEST MODE function can be used to provoke any diagnostic trouble codes (DTC). The function reduces the conditions for how quickly diagnostic trouble codes (DTCs) are stored in the control module and the test drive becomes easier.
- Start the engine
- Activate TEST MODE.
Note! Do not switch off the engine!
- Disconnect the VIDA station. Test drive the car as described below.
Warning! Please observe traffic regulations.
Note! Before test driving, the transmission should be at operating temperature, approximately 80-90°C.
Shift the gear selector to position 3 (third gear with Geartronic). Carefully accelerate to 85 km/h. Maintain the same speed for a few seconds. Carefully accelerate for approximately 30 seconds to increase the engine torque.
Hint: The car must be driven at an engine speed where the lock-up function is normally fully activated and not slipping. The following gear positions and speeds are also possible:
- 120 km/h gear position D
- 85 km/h gear position 3.
Criteria for diagnostic trouble code (DTC):
- The transmission fluid temperature must exceed 30°C
- No shifting during the evaluation period
- Positive engine torque (no engine braking)
- Gear selector in position D, 3 or 2 (4T65EV).
Gear selector in Geartronic position and gears 4, 3 or 2 (4T65EV-GT)
- Speed 85 km/h for at least 30 seconds.
Continue - Checking diagnostic trouble codes (DTCs)
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Checking diagnostic trouble codes (DTCs)
- Ignition on
- Read off diagnostic trouble codes (DTCs).
If any other diagnostic trouble codes (DTCs) than TCM-002F are stored, these must be fault-traced and remedied after this fault-tracing is completed.
Was diagnostic trouble code (DTC) TCM-002F stored?
DTC - Fault-tracing information
NO DTC - Procedure complete
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Fault-tracing information
Information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.
Do you want to exit fault-tracing?
Yes - Exit Fault-Tracing
No - Attempt New Test
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Attempt New Test - Checking the diagnostic trouble codes (DTCs)
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