Remanufactured 6L45 / 6L50 Transmissions: Specs & Updates

Replacement 6L45 / 6L50 Transmission Prices:

To get an estimate on a rebuilt 6L45 / 6L50, click Get a Free Estimate.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

6L45 Vehicle Compatibility – Makes & Models

2013–2015: Cadillac ATS
2010–2013: Cadillac SLS
2007–2010: BMW X3
2007+: BMW 330i / 328i / 325i / 323i / 320i / 318i / 316i
2007+: BMW 130i / 128i / 125i / 120i / 118i / 116i
2009+: BMW X1

6L50 Vehicle Compatibility – Makes & Models

2007–2011: Cadillac SLS
2007–2011: Cadillac STS
2007–2009: Cadillac SRX
2008+: Cadillac CTS
2015-+: Chevrolet Colorado

6L45 / 6L50 Transmission Diagnostic Trouble Codes | DTC

Trouble CodeDescription
P0711Transmission Fluid Temperature Sensor Circuit Range/Performance
P0712Transmission Fluid Temperature Sensor Circuit Low Input
P0713Transmission Fluid Temperature Sensor Circuit High Input
P0714Transmission Fluid Temperature Sensor Circuit Intermittent P0715
P0715Input/Turbine Speed Sensor Circuit
P0716Input/Turbine Speed Sensor Circuit Range/Performance 
P0717Input/Turbine Speed Sensor Circuit No Signal
P0718Input/Turbine Speed Sensor Circuit Intermittent
P0720Output Speed Sensor Circuit
P0721Output Speed Sensor Circuit Range/Performance
P0723Output Speed Sensor Circuit Intermittent
P0729Gear 6 Incorrect Ratio
P0730Incorrect Gear Ratio
P0731Gear 1 Incorrect Ratio
P0732Gear 2 Incorrect Ratio
P0734Gear 4 Incorrect Ratio
P0735Gear 5 Incorrect Ratio
P0740Torque Converter Clutch Circuit Malfunction
P0741Torque Converter Clutch Circuit
P0742Torque Converter Clutch Circuit Stuck On
P0744Torque Converter Clutch Circuit Intermittent
P0748Pressure Control Solenoid 'A' Electrical
P0750Shift Solenoid 'A'
P0753Shift Solenoid 'A' Electrical
P0755Shift Solenoid 'B'
P0758Shift Solenoid 'B' Electrical
P0767Shift Solenoid 'D' Stuck On
P0850Park/Neutral Switch Input Circuit
P0897Transmission Fluid Deteriorated
P0973Shift Solenoid “A” Control Circuit Low
P0976Shift Solenoid “B” Control Circuit Low
P0977Shift Solenoid “B” Control Circuit High
P0979Shift Solenoid “C” Control Circuit Low
P0980Shift Solenoid “C” Control Circuit High
P0982Shift Solenoid “D” Control Circuit Low
P0983Shift Solenoid “D” Control Circuit High
P0984Shift Solenoid “E” Control Circuit Range/Performance

6L45 / 6L50 Transmission Technical Service Bulletins | TSBs

TSB 07-07-30-032B – Ignition key sticks, shifter binds, “shift to park” message displayed, dead battery – 5L40 Transmission | 5L50 Transmission | 6L50 Transmission | 6L80 Transmission
2007 – 2008 Cadillac SRX – 2007 – 2008 Cadillac STS – 2007 – 2008 Cadillac STS-V – 2008 Cadillac CTS
Problem – Owners may notice that the shifter seems to bind when shifting into gear or park. The ignition key may stick or be difficult to remove (SRX only). A “shift to park” message may be constantly displayed in the driver information display screen, resulting in a dead battery.
Solution – These transmission problems may be caused by out of adjustment shift linkage, a slow Brake Transmission Shift Interlock mechanism, or a Park Confirmation microswitch that is not closed.

TSB PIP4570B – Erratic torque converter clutch operation, metallic debris in the oil pan, and/or P0741, P0751 DTC – 6L50 Transmission
2008 – 2009 Cadillac CTS – 2008 – 2009 Cadillac SRX – 2008 – 2009 Cadillac STS
Problem – Drivers may notice erratic torque converter operation, which can include erratic shifting and unexpected engine stalling.
Solution – These 6L50 transmission problems can be caused by de-bonding of the TCC friction material. This can lead to internal transmission damage, possibly requiring a transmission rebuild or remanufactured transmission. At the very least the torque converter itself may need to be replaced.

Common Problems with the 6L45 / 6L50

Lack of Response
Leaking Fluid
Low Fluid
Burning Smell
Grinding or Shaking
Whining, Clunking or Humming
Refuses to Go Into Gear
Torque Converter Issues
Valve Body Issues
Transmission Noisy in Neutral
Gears Slipping
No 3rd or 4th Gear
No 1st or 2nd Gear
No Reverse
Dragging Clutch
Trouble Codes / Check Engine Light


How to Buy a Remanufactured 6L45 / 6L50 Transmission

1) Buying Locally

When you go to your local repair shop, they’ll order a remanufactured 6L45 / 6L50 transmission, then mark up the price. So at the end of the day, you’ll be paying 15% to 30% more than the actual cost of the unit.

2) Buying Online

Buying a reman transmission through a company like Street Smart Transmission will save you a considerable amount of money because you pay the wholesale price (avoiding a repair shop’s 15% to 30% markup), they’ll ship the unit to the shop of your choice free of charge, and returning your old transmission is free as well. Then all you have to pay for is the labor to install the unit (usually $400 to $800), and you’re on your way.

How Does it Work?

To order a remanufactured transmission from a company like Street Smart Transmission, all you need to do is provide your vehicle’s VIN number, the mileage, and the address of the repair shop that you want it shipped to.


Replacing a transmission can be expensive, so Street Smart Transmission offers financing through PayPal Credit. Depending on your credit, you’ll be able to order a new transmission, get back on the road, then pay for it over time. You may have to pay labor charges for the installation up front, but you won’t have to shell out for the transmission all at once.

Shipping Charge/Location

When it comes to shipping, a transmission is quite heavy. So you’re going to pay quite a bit of money, unless the reman transmission company offers free shipping. Street Smart offers free shipping to a business address, which is usually the repair shop that you’ve chosen to install the unit.

What is a Core Charge (Core Deposit)?

Every remanufactured transmission originally came from somebody else’s car. Therefore, they need your broken transmission in order to refurbish it for another customer.

Your old/damaged transmission is called a “core”, and many companies will collect a core charge (usually $500 to $1500), which will be refunded once they receive your old transmission. (Street Smart does not charge an up-front core charge.) Make sure to ask any company for their core return policy, so you’ll know what to expect.

Easy Core Return

Our Recommendation

We recommend Street Smart Transmission. We have found Street Smart to be of the highest quality. Their transmissions carry a 3 year / unlimited miles warranty that covers both parts and labor. Their warranty is nationwide and attached to the VIN so it is transferable with ownership if you decide to sell the vehicle. It also covers both parts and labor for the installation of the replacement transmission.

Watch the Remanufacturing Process

How it Works


Finding a Shop to Install the Remanufactured Transmission

If your transmission has failed, you’re going to need a skilled mechanic to replace it. You can find a shop to install your transmission using our shop locator map.

For warranty purposes, you need to find a reliable repair shop. That way, if the replacement transmission doesn’t work properly, the warranty will cover it.

Ready to Replace Your 6L45 / 6L50 Transmission?

Click Get a Free Estimate for an unbeatable price on a replacement remanufactured transmission.

Need a replacement transmission? Get an estimate for replacement transmissions and local installation. Look up your transmission model by vehicle make and model.

What Transmission Do I Have?

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1 year ago

Truck doesn’t go into gear

George Bingham
4 years ago

I am in the process of finding a 6l50 to back up my new (2018 crate) 2.8l duramax that will be retrofit into my 1991 toyota land cruiser.

Do you build custom transmissions for special projects this one?

1 year ago
Reply to  George Bingham

Truck doesn’t go into gear

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