Introduced for the 2005 model year, the Buick Terraza was a luxury-themed minivan that didn’t sell particularly well in North America when it was new. But it offers outstanding value on the used market, given its luxurious amenities and V6 power. Both engines were mated to the 4-speed GM 4T65E transmission, which with routine maintenance can be fairly reliable. However, Buick Terraza transmission problems do still happen. So let’s find out what you can do.
Buick Terraza Transmission Models
Buick Terraza: 4T65E FWD Transmission
Buick Terraza 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 Terraza 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 Terraza Transmission Recalls
Buick Terraza Technical Service Bulletins (TSB)
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 00-06-04-037A – Harsh shifting with DTC’s P0716 and/or P0717 – 4T40E Transmission | 4T45E Transmission | 4T65E Transmission
Problem – Some drivers may experience unusually harsh gear changes, accompanied by a P0716 and/or P0717 DTC
Solution – This problem can be caused by an intermittent connection of the input speed sensor circuit at the transaxle 20-way connector
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 Terraza Transmission
TCC Solenoid Circuit DTC – Buick Terraza 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?
Once you’ve discovered that you have a transmission issue, continuing to drive your minivan can make the problem even worse. Many 4T65E transmission problems like slipping in and out of gear, or refusing to shift out of a gear, will get a lot worse if you continue to drive. And you may have to spend even more money to replace broken hard parts like a clutch drum. At which point it may be more cost effective to just buy a remanufactured 4T65E transmission.
How often does a Buick Terraza transmission need to be replaced?
With proper maintenance, a Buick Terraza 4T65E transmission can last between 130,000-180,000 miles. A properly built remanufactured 4T65E on the other hand, may last significantly longer if all of the factory design flaws are addressed.
How are Buick Terraza transmission issues diagnosed?
The first step to diagnosing a 4T65E transmission problem is to connect a code reader to the OBDII port under the dash. After all of the diagnostic trouble codes have been assessed, the mechanic can then perform a visual inspection, and possibly a test drive, to verify the problem.
How is a Buick Terraza transmission replaced?
Because the Buick Terraza was designed as a front wheel drive vehicle (even if it has all wheel drive), the motor may have to be partially removed in order to pull the old transmission out. Obviously, installing the new 4T65E is a reverse of the removal process. However, the ECU / PCM will need to be reprogrammed / reflashed to accept the new transmission.
Recommendations for Buick Terraza 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 Terraza transmission here, then find a local shop using our Find a Shop guide to install it for you.
How to Solve Buick Terraza Transmission Problems
Solution A: Buy a Used Buick Terraza Transmission
Most people might think that buying a used 4T65E transmission would be the cheapest way to get back on the road. However, there is no guarantee that a used transmission won’t have the same problems that you’re having right now. And speaking of guarantees, that junkyard warranty probably won’t cover all labor charges if something goes wrong and you have to replace that transmission again.
Solution B: Buy a Rebuilt Buick Terraza Transmission
If you decide to buy a rebuilt 4T65E transmission, keep in mind that most mechanics will simply use OE spec Buick Terraza transmission parts, which means that the factory design flaws will still be there. Plus, any warranty that they give you might be good at that shop. So if you have transmission problems while your out of town, that warranty won’t do you any good.
Solution C: Buy a Remanufactured Buick Terraza Transmission
If you’re looking for a long term solution to your Buick Terraza transmission problems, then a remanufactured 4T65E transmission may be your best bet. There are often upgraded to correct for factory design flaws, which will make them last a lot longer than a stock transmission. And a few of them will offer nationwide warranties too.
What Problem Does Your Buick Terraza 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!