Introduced for the 2006 model year, the Buick Lucerne was a full-size sedan that was intended to replace the Buick LeSabre and Buick Park Avenue. It was equipped with several different engines, which were mated to either a 4T65E transmission, or a 4T85 transmission. These are fairly hearty gearboxes, but Buick Lucerne transmission problems do still happen. So let’s look at what you can do about them.
Buick Lucerne Transmission Models
Buick Lucerne: 4T65E Transmission
Buick Lucerne: 4T85E Transmission
Buick Lucerne 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 4T65E Transmission:
|Transmission||Street Smart Transmission|
What are the DTC codes related to Buick Lucerne transmission problems?
|P0717||Input/Turbine Speed Sensor Circuit No Signal|
|P0730||Incorrect Gear Ratio|
|P0753||Shift Solenoid 'A' Electrical|
|P0758||Shift Solenoid 'B' Electrical|
|P1860||TCC PWM Solenoid Circuit Electrical|
Buick Lucerne Transmission Recalls
Buick Lucerne Technical Service Bulletins (TSB)
Problem – Transmission fluid leaks may be observed under the vehicle, which may be caused by a 4T65E reverse servo seal that can actually shrink in the cold weather below 20°F/-6.7°C
Solution – Replace reverse servo cover seal
Problem – Drivers can experience unusually harsh shifts, along with the following DTC’s: P0716, P0717, P0730, P0753, P0758, P1860, P1887
Solution – Inspect, repair and/or replace the transaxle 20-way connector to the transmission wiring harness
TSB 06-07-30-023 – 4T65E transmission 1-2 Shift Shudder
Problem – Shuddering or shaking may be felt during the 1-2 shift, under light acceleration at speeds below 25 mph.
Solution – To correct this common 4T65E transmission problem, the entire second clutch assembly will need to be replaced.
TSB 08-07-30-016 – Slipping, refusal to shift, overheating
Problem – Slipping between the gears, overheating, refusal to shift out of a gear, and/or DTC P0894 or P0218, may be because by friction material debonding from the torque convertor clutch (TCC).
Solution – If the friction material has circulated throughout the transmission, the entire transmission may need to be replaced. It is possible to remove the material from the internal components (like transmission cooler lines and the valve body), but it depends on the extent of the damage.
Common Problems with the Buick Lucerne Transmission
TCC Solenoid Circuit DTC – 2006-2007 Buick Lucerne 4T65E
Problem – Diagnostic trouble codes (P0742, P2761, P2764) relating to the torque convertor clutch, may be caused by an incorrectly routed internal wiring harness that can short itself out over time.
Solution – To solve this problem, reposition the tan colored TCC solenoid so that it does not come in contact with the metal wiring harness retaining clip.
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?
If your Buick is still drivable, then the answer is obviously yes. However, it is very likely that ignoring those Buick Lucerne transmission problems can lead to even more damage. Especially if you continue to drive the car on a daily basis.
How often does a Buick Lucerne transmission need to be replaced?
About a century ago, Buick’s were considered to be the finest automobile in the world. And while they may have lost a bit of brand panache, they are still very well made vehicles. That said, the average life span of a Buick Lucerne 4T65 transmission / 4T85 transmission tends to be around 130,000-180,000 miles. But if you upgrade to a high quality remanufactured transmission, that life-cycle could be extended dramatically.
How are Buick Lucerne transmission issues diagnosed?
The first step that a mechanic is likely to take, would be to connect a code reader to the car’s OBDII computer port. Once they’ve retrieved all of the diagnostic trouble codes, they’ll be able to narrow down the problem. After that, a visual inspection will need to be performed, in order to verify the diagnosis.
How is a Buick Lucerne transmission replaced?
Because the Buick Lucerne is primarily a front wheel drive car, the motor mounts may need to be loosened before transmission can be removed. Installation is obviously a reverse procedure, but the ECU/PCM will have to be reprogrammed / reflashed to accept the new transmission using the latest GM subscription.
Recommendations for Buick Lucerne transmission issues?
To save time and get back on the road faster, have your 17-digit truck VIN# handy and you can get an online quote for a reman Buick Lucerne transmission here, then find a local shop using our Find a Shop guide to install it for you.
How to Solve Buick Lucerne Transmission Problems
Solution A: Buy a Used Buick Lucerne Transmission
The easiest and cheapest way to solve major Buick Lucerne transmission problems, would be to install a used 4T65E transmission, or a used 4T85 transmission. These are commonly found in most salvage yards, and often come with a 30-90 day warranty. But a transmission is a very complex piece of machinery, and there is no way to tell the true condition of the internal components unless you disassemble it completely. And, usually only gets you a replacement transmission if the first one is defective. The labor charges to install it, will most likely come out of your pocket.
Solution B: Buy a Rebuilt Buick Lucerne Transmission
The second option would be to get a rebuilt 4T65E transmission, or a rebuilt 4T85E transmission. And on the surface, this might seem like the better choice. However, most mechanics will simply use a factory rebuild kit, which will not address any of the factory design flaws. Plus, that rebuilt transmission warranty may only be honored by a small number of shops in a particular area.
Solution C: Buy a Remanufactured Buick Lucerne Transmission
These cars are designed to last for a very long time, so it makes sense to invest in a quality remanufactured Buick Lucerne transmission. These often feature many upgrades that are designed to correct the factory design flaws, and the warrantees are typically superior to that of a rebuilt or used transmission.
What Problem Does Your Buick Lucerne 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!