When a hydraulic/mechanical fault occurs with one of these solenoids (as mentioned earlier), the diagnostic process begins with checking the operation of the solenoid and its related valve(s).

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While DTC signal trouble, they do give you a good deal of information on your problem-solving journey.

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TCC Trouble

1/16/17 11:05 AM

Companies who rebuild torque converters will tell you the hundreds of times their converters are unjustly blamed for a problem. 

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It’s difficult enough to remember the size of a transmission, but adding transmission manufacturers to the list makes it an even greater task. Let's take a look inside to get more info.

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GM’s 6L40/50/80 series rear wheel drive transmissions referred to as GM6 may come in to the shop experiencing a complaint of a delayed reverse accompanied with a slipping reverse as well as a flare or slide 2-3 shift. 

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In our last blog post we talked about how the solenoid, hydraulic interaction achieves a specific gear and diagnostic tips. We also started off with how the pump is the heartbeat of the transmission. Look inside to read the continuation of this post and its valuable contents inside.

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How solenoid, hydraulic interaction achieves a specific gear and diagnostic tips - inside this article!

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In this last and final article of this series, we will be looking at the Transmission Adaptive Values Learn. As most know by now, this is a series of tests that are run to allow the transmission control module (TCM) to learn individual clutch characteristics. Click below to read more.

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Inside we will be looking at the Line Pressure Specifications and continuation of A Look at Ford and GM's Jointly Built 6T40 Transmission: Part 2 of 4

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With the exception of the Low and Reverse Clutch, each clutch inside this transmission is operated by a solenoid through its respective regulating valve. 


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Oct. 10, 2002, Ford and GM announced that they would join together to develop a new six-speed front wheel drive automatic transmission. Working on this project together would not only offer a cost-saving factor in its development, they could bring a new transmission to market sooner. 

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2005 and up G.M. Trucks equipped with the 4L60/65/70E transmission may exhibit a complaint of Torque Converter slip when the vehicle is hot, accompanied by a Diagnostic Trouble Code P0894, Component Slip. This complaint usually occurs after an overhaul and/or after the repair of the TCC Regulator valve bore.

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A 2009 BAS (Belted Alternator Starter) equipped vehicle may have a complaint of the engine stop/start system being inactive and the Malfunction Indicator Lamp (MIL) is illuminated.

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