Built on the GM Lambda platform, the Buick Enclave is a midsize crossover that offers 3 rows of seating in a premium package. The first generation 2008-2017 Buick Enclave used the 6T75E 6-speed automatic transmission, and the second gen Enclave got a new 9-speed 9T65 transmission starting in the 2018 model year. These are generally reliable gearboxes, but Buick Enclave transmission problems do happen, so let’s figure out what you can do about them.
Buick Enclave Transmission Models
Buick Enclave: 6T75E Transmission (2008-2017)
Buick Enclave: 9T65 Transmission (2018-Up)
Buick Enclave Transmission Replacement Cost Estimate
Pricing varies by model. To be 100% sure on pricing, have your VIN# handy and use our Get An Estimate feature to look up your transmission by VIN#.
Replacement 6T75E Transmission:
|Transmission||Street Smart Transmission||Autozone||Advance Auto Parts|
|6T75E / 6T70||2220||2400||2400|
What are the DTC codes related to Buick Enclave transmission problems?
P0716 – Input/Turbine Speed Sensor Circuit Range/Performance – This DTC means there is a problem with the input / turbine speed sensor, and the ECU may not be able to control the transmission properly.
P0722 – Output Speed Sensor Circuit No Signal – This DTC is triggered when the ECU stops receiving data from the OSS sensor.
P0723 – Output Speed Sensor Circuit Intermittent – This OBDII code means the ECU is not receiving a steady signal from the output speed sensor
P0751 – Shift Solenoid ‘A’ Performance or Stuck Off – When you see this DTC, it means the ‘A’ shift solenoid is not working right, or is stuck in the ‘off’ position.
P0756 – Shift Solenoid ‘B’ Performance or Stuck Off – If the ECU saved this code, then a solenoid isn’t working right, or it’s stuck off.
P0776 – Pressure Control Solenoid ‘B’ Performance or Stuck Off – This diagnostic trouble code means there is a mechanical problem with this solenoid.
P0796 – Pressure Control Solenoid ‘C’ Performance or Stuck Off – If the pressure control solenoid labeled ‘C’ isn’t working correctly, or it gets stuck in the ‘On’ position, this DTC will be saved.
P0741 – Torque Converter Clutch Circuit Performance or Stuck Off – This diagnostic trouble code means the TCC solenoid is not performing according to specification.
P0766 – Shift Solenoid ‘D’ Performance or Stuck Off – When this solenoid isn’t functioning properly, or it gets stuck in the ‘off’ position, this code will get stored.
P2703 – Failed Friction Element D – This trouble code can be triggered by a failed friction element like a clutch disc.
P0720 – Output Speed Sensor Circuit – This DTC is triggered when there’s an issue with the data coming from the output speed sensor.
P0730 – Incorrect Gear Ratio – This DTC means the ECU has detected either an electrical or hydraulic issue affecting the shift pattern.
P0657 – Voltage Problem in the ‘A’ Circuit – This transmission problem is often caused by a short, or bad ground on the PCM or PCM wiring harness.
P0700 – Transmission Control System – This generic code means something went wrong in the electrical system that controls the transmission.
P0715 – Input/Turbine Speed Sensor Circuit – This DTC means the signal coming from the transmission input speed sensor does not meet the ECU’s programmed parameters.
P0717 – Input/Turbine Speed Sensor Circuit No Signal – If the ECU can’t communicate with the input speed sensor, this DTC gets stored.
P0791 – Intermediate Shaft Speed Sensor Circuit – This DTC means there is a general problem with the ISS sensor.
P0793 – Intermediate Shaft Speed Sensor Circuit No Signal – This DTC means there is no signal returning to the ECU from the ISS sensor.
Buick Enclave Transmission Recalls
2014 Buick Enclave Recall 14V092000 / 14048
Summary – According to the recall, the Buick Enclave transmission shift lever may become detached from the transmission shift cable adjuster. If this happens, the transmission shifter won’t work properly, and the gear indicator won’t be able to display the gear that’s actually selected.
Consequence – Should the shifter become detached while the truck is being driven, the driver won’t be able to select Park, even though the shifter is in the correct position. This can lead to an unintended rollaway, resulting in serious property damage and/or injury.
Remedy – This recall began on April 10, 2014, and Buick dealers were instructed to inspect and replace any affected transmission shift cable adjusters, free of charge. Owners can contact Buick at 1-866-694-6546, referring to recall # 14048. Or they can call the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236
2009 Buick Enclave Recall 09V073000 / 09041
Summary – On some 2009 Buick Enclave’s, the transmission shift cable adjustment clip may come loose, causing the gear indicator to display the wrong gear.
Consequence – If this problem occurs, the driver could remove the ignition key and exit the vehicle thinking the transmission is in Park, even though it isn’t. This can lead to a rollaway, which can cause injury and/or property damage. A lesser consequence would be the inability to start the vehicle because the transmission is not in Park.
Remedy – This recall began on March 24, 2009, and Buick dealers were instructed to inspect and replace any affected transmission shift cable adjustment clips, free of charge. Owners can contact Buick at 1-866-694-6546, referring to recall # 09041. Or they can call the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236
Buick Enclave Technical Service Bulletins (TSB)
Related to DTC P0741 – 2008-2010 Buick Enclave
Problem – If after rebuilding a 6T75E, the TCC remains stuck in the ‘off’ position, the problem may be due to using the incorrect control valve channel upper plate.
Solution – Install a revised control valve channel upper plate with slot (GM part #24226373).
TSB 13120A – 2013 Buick Enclave
Problem – The torque converter clutch solenoid can stick due to debris in the transmission. When the vehicle is at the end of a coast-down, as the vehicle is coming to a stop, a stuck solenoid will fail to release the torque converter clutch. This keeps the engine directly connected to the driven wheels. As the vehicle stops, the engine speed will be pulled down below normal idle speed and the engine may stall. The vehicle can be immediately restarted and driven.
Solution – The valve control solenoid should be replaced, and the transmission control module will have to be reprogrammed in order to correct the problem.
TSB 09-07-30-012B – 2008-2009 Buick Enclave
Problem – Owners may experience a Check Engine/SES light along with no reverse and/or a slip / flare or harsh shifts in 3rd and/or 5th gear. This condition may be caused by a broken 3-5-R clutch wave plate, allowing the apply piston to over- stroke, causing the piston to leak and causing loss of gear application. This normally will not occur before approximately 32,000 km (20,000 mi). Debris generated by the condition can affect the operation of the speed sensors and other clutches.
Solution – A new 35R clutch wave plate will need to be installed.
Common Problems with the Buick Enclave Transmission
Lack of Response
Grinding or Shaking
Whining, Clunking or Humming
Refuses to Go Into Gear
Torque Converter Issues
Valve Body Issues
Transmission Noisy in Neutral
No 3rd or 4th Gear
No 1st or 2nd Gear
Trouble Codes / Check Engine Light
Can I drive with a transmission problem?
Depending on the symptoms, simple Buick Enclave transmission problems can easily morph into an expensive disaster. So it’s best to get gearbox issues properly diagnosed, before have a chance to get out of hand.
How often does a Buick Enclave transmission need to be replaced?
Maintenance and driving style have a huge affect on how long the average Buick Enclave 6T75 transmission will last. But factory design flaws play a part too. On average, we’ve seen the Buick Enclave transmission last for between 130,000-180,000 miles. A high quality replacement transmission however, can last considerably longer if all of the factory design flaws have been properly addressed.
How are Buick Enclave transmission issues diagnosed?
Guessing what a transmission problem might be caused by is pretty easy. But figuring out what the problem actually is, takes lots of experience and tools. Most mechanics can pull diagnostic trouble codes from the Buick’s computer in a matter of minutes. That way they’ll know what to look for to verify the problem.
How is a Buick Enclave transmission replaced?
To replace a Buick Enclave transmission, it has to be lifted off the ground in order to gain access to all of the transmission parts that have to be unbolted. The engine may also need to be unbolted. Then the transmission can be lowered to the ground (typically with a transmission jack), so the new transmission can be installed. Once it is in place, for the 6T75E, the vehicle PCM will have to be reprogrammed / reflashed to accept the new transmission using the latest GM subscription.
Recommendations for Buick Enclave transmission issues?
To save time and get back on the road faster, have your 17-digit VIN# handy and you can get an online quote for a reman Buick Enclave transmission here, then find a local shop using our Find a Shop guide to install it for you.
How to Solve Buick Enclave Transmission Problems
Solution A: Buy a Used Buick Enclave Transmission
The quickest way to fix your transmission problems is to simply buy a used 6T75E transmission and have it installed. These can be found at most junk yards, and they often come with a 30-90 day warranty. However, there’s no way to determine the actual condition of the internal components, so you could be spending a bunch of money to have the exact same problems. Plus, that warranty only covers the transmission if it’s defective, not the labor costs that you’ll have to pay.
Solution B: Buy a Rebuilt Buick Enclave Transmission
Another option would be a rebuilt 6T75E transmission. A local repair shop will remove your transmission, then install a bunch of new parts during the rebuild. The problem here is, the skills and experience of each transmission rebuilder will vary widely from shop to shop, so you could have problems from something that wasn’t adjusted properly. And the 1-2 year warranty might only cover you at certain transmission repair shops, in a specific geographical area.
Solution C: Buy a Remanufactured Buick Enclave Transmission
Many owners depend on their vehicle to commute and get things done. Their gasoline engines are designed to go 100’s of thousands of miles, so it makes sense to invest in a quality remanufactured 6T75E transmission. You’ll get a much longer service life, and the warranty will cover any necessary transmission repairs.
What Problem Does Your Buick Enclave Have?
Let us know the year, mileage and problem you’re having as well as any trouble (OBD) codes you’ve found. If you’ve been given a quote or paid for a repair, we’d like to hear about that too!