2016 Silverado TCM Location & Replacement Guide (6L80)

Where is the 2016 Silverado TCM Located?

If you are looking for the 2016 Silverado TCM (Transmission Control Module) location, you will need to look inside the transmission oil pan.

Unlike older trucks where the module was a standalone box mounted in the engine bay, the 2016 Chevy Silverado (equipped with either the 6-speed 6L80/6L90 or the 8-speed 8L90 transmission) uses an integrated unit. The TCM is built directly into the TEHCM (Transmission Electro-Hydraulic Control Module). This combined unit—housing the TCM, solenoids, and pressure switches—is bolted flush against the valve body inside the transmission.

Because of this internal location, accessing the 2016 Silverado’s TCM requires dropping the transmission pan and draining the fluid.

For a practical guide on how to find the module and related steps, see this helpful page that shows where to find the part and how to inspect it: find the module.

Is Your 2016 Silverado TCM Actually Failing? (The Warning Signs)

Forget the textbook definitions about “drivetrain brains” and “sensor translation.” If you are reading this, you likely care about one thing: is my truck safe to drive, and how do I fix it? Before you gear up to drop the transmission pan, verify that your Silverado is exhibiting the classic, real-world symptoms of a dying TEHCM. It rarely fails quietly. You will usually experience:

The “Chevy Shudder”: It feels exactly like you are driving over highway rumble strips when cruising between 45 and 60 mph.
The 1-2 Slam: Accelerating from a stop sign results in a violent jerk, making it feel like you just got rear-ended when the truck shifts into second gear.
Limp-Home Mode: The truck goes into self-preservation mode, locking itself in 3rd gear. Your RPMs will scream on the highway, and you won’t be able to manually shift out of it.
The Phantom PRNDL: The gear indicator line under the P-R-N-D-L on your dashboard completely disappears, or your reverse lights fail to turn on when backing up.

What is actually happening inside your transmission? In plain English: Your 2016 Silverado uses fluid pressure to change gears. The TCM is simply the circuit board that opens and closes electronic valves (solenoids) to direct that hot fluid. When the circuit board fries from the heat, or a valve gets stuck with metal shavings, the fluid goes to the wrong place at the wrong time. The result? Your truck violently misses gears.

Don’t Replace It Yet: How to Reset the TCM

Before you panic, drain your fluid, and order a $600 part, try a hard reset. Sometimes, the physical module is perfectly fine, but the software’s memory has gotten corrupted.

Modern GM transmissions “learn” how you drive. They constantly adjust fluid pressures to match your throttle habits using adaptive shift tables. If you recently bought the truck used, or if your battery died, the TCM might just be confused.

Here is how to force the brain to start over:

The Pedal Trick: Turn your ignition to the “ON” position, but do not start the engine. Press the gas pedal all the way to the floor and hold it there for a solid 15 seconds. Turn the key off, release the pedal, and wait two minutes. Start the truck and take it for a spin.
The Battery Drain: If the pedal trick doesn’t work, pop the hood and pull the negative battery cable. Leave it disconnected for at least 30 minutes. This drains the residual power from the truck’s capacitors and forces a hard reboot of the TEHCM. Reconnect it, fire up the truck, and go for a 20-minute drive in stop-and-go traffic.

A quick heads-up: Your first few shifts after a reset might feel noticeably clunky. Don’t panic. That is normal. The computer is just figuring out the baseline fluid pressures again.

Diagnosing a Bad 2016 Silverado TCM: Codes & Costs

Because the 2016 Silverado utilizes a combined TEHCM, a failure could be the TCM circuit board itself, a stuck solenoid, or a blown pressure switch.

If your Check Engine Light (CEL) is on and the truck is in “limp mode,” use an OBD-II scanner to pull the diagnostic trouble codes (DTCs). Here are the most common codes your scanner will flag for the 6L80 and 8L90 transmissions:

OBD-II Error Code	Primary Component Flagged	Common Silverado Symptoms
P0700	Transmission Control System (General)	Check Engine Light on, rough shifting. (This is an informational code requesting the ECU to turn on the CEL; you must scan the TCM for the specific sub-code).
P0613	TCM Processor Fault	Complete loss of communication, limp mode, vehicle won’t shift out of park.
P0706	Transmission Range Sensor Circuit Range/Performance	PRNDL display blinks or disappears, truck won’t crank, reverse lights fail.
P0776 / P0796	Pressure Control Solenoids (Clutch)	Slipping gears, harsh engagements, delayed shifts under heavy throttle.

Replacement Attributes: What You Need to Know

If diagnostics confirm the TEHCM is dead, you cannot simply swap in a used part from a salvage yard. You must account for the following specifications:

Part Reprogramming: A new TEHCM comes blank. It must be flashed with your Silverado’s specific VIN using GM’s Service Programming System (SPS) and a J2534 pass-through tool.
Estimated Part Cost: An OEM ACDelco TEHCM for a 2016 6L80 generally costs between $450 and $700, depending on the vendor.
Labor Costs: If you have a shop do the work, expect to pay $300 to $500 in labor, plus the cost of 6-8 quarts of Dexron VI fluid and a new AC Delco pan gasket.

Why Does the 2016 Silverado TCM Fail? (Mechanic Insights)

The integrated TEHCM design in the 2016 Silverado saves space and wiring, but it exposes the sensitive transmission control module to extreme conditions. Operating submerged in transmission fluid that regularly exceeds 190°F takes a severe toll on the electronics and seals over time.

If you are dropping the pan to access the TCM, here are the actual failure points you need to look for:

Blown Pressure Switch Laminates (The $50 Fix): Often, the TCM circuit board hasn’t failed at all. Instead, the thin plastic laminate film covering the fluid pressure switches tears over time. This causes internal hydraulic leaks, leading to harsh shifting or codes P0776/P0796. Pro-Tip: If your pressure switches are blown but the module communicates fine, you do not need a $600 TEHCM replacement. You can install an aftermarket pressure switch rebuild kit (like those from Sonnax) for under $50.
Torque Converter “Glitter”: The 2014-2018 Silverado 6-speed transmissions are notorious for torque converter shudder and failure. When the converter degrades, it pumps microscopic metal shavings through the fluid. These metal flakes stick to the magnetic sensors on the TEHCM, blinding the module. If you drop the pan and find excessive “glitter” in the fluid, replacing the TCM won’t solve the root mechanical failure.
External Harness Leaks: Before condemning the internal module, check the main wiring harness connector on the outside of the transmission case (passenger side, just above the pan line). The O-rings here often leak, allowing transmission fluid to push up into the wiring connector, causing short circuits and loss of communication (Code P0613). Spray it out with electrical contact cleaner before assuming the TEHCM is dead.

How to Access the 2016 Silverado TCM (TEHCM)

Because the TCM is integrated into the valve body inside the transmission pan, getting to it requires a partial transmission service. If you are comfortable dropping a transmission pan, you can access the module at home.

Safety Precautions First

Let it cool: Transmission fluid can exceed 190°F during normal driving. Let the truck sit for at least two hours before beginning.
Support the vehicle: Never work under a truck supported only by a hydraulic jack. Always use heavy-duty jack stands placed on the factory lift points.
Wear PPE: Wear safety glasses and nitrile gloves to protect yourself from dripping fluid.

Tools & Materials Needed

10mm and 13mm sockets (with extensions)
Torque wrench
Large fluid catch pan (at least 10-quart capacity)
Replacement transmission pan gasket
6-8 quarts of Dexron VI transmission fluid (depending on your exact transmission model)
Brake cleaner and rags

Step-by-Step: Finding the Module

Safely lift the truck: Secure the vehicle on jack stands so you have enough clearance to slide underneath.
Position the catch pan: Place your large fluid catch pan directly underneath the transmission oil pan.
Drop the transmission pan: Slowly loosen the bolts around the perimeter of the transmission pan. Do not remove them completely at first. Pry one corner slightly to break the gasket seal and let the fluid drain out in a controlled manner. Once drained, remove the remaining bolts and lower the pan.
Locate the TEHCM: Look up into the transmission. You will see the valve body assembly. The TEHCM (which houses the TCM) is the plastic and metal unit bolted directly to the bottom of the valve body. It typically has a large yellow or black electrical connector plugging into it.
Inspect the connector: Before removing any bolts from the TEHCM itself, push the release tab on the wiring harness to disconnect it. Check the pins for transmission fluid intrusion or corrosion, which is a common cause of TCM failure codes.

Frequently Asked Questions (People Also Ask)

Does a new 2016 Silverado TCM need to be programmed?

Yes. If you replace the TEHCM, the new unit will arrive completely blank. It will not communicate with your truck’s ECM (Engine Control Module) out of the box. It must be flashed with your specific VIN using GM’s Service Programming System (SPS) and a J2534 pass-through programming tool. You cannot simply plug and play a replacement.

Can I replace just the TCM, or do I need the whole valve body?

On the 2016 Silverado (6L80/6L90 and 8L90), the TCM is integrated into the TEHCM (Transmission Electro-Hydraulic Control Module), which bolts to the bottom of the valve body. You do not need to replace the entire aluminum valve body unless the internal valves are physically scored or warped. You can replace just the TEHCM unit.

What transmission fluid does a 2016 Silverado take?

The 2016 Silverado requires Dexron VI fully synthetic transmission fluid. If you are dropping the pan to replace or inspect the TCM, you will need approximately 6 to 8 quarts for a standard pan drop and filter change. Do not use multi-vehicle ATF; stick to the exact Dexron VI specification to prevent clutch degradation.

Can a bad TCM cause a P0700 code?

Yes, but P0700 is just a generic “informational” code. It simply means the TCM has detected a fault and is asking the engine computer to turn on the Check Engine Light. To find out why the TCM is failing, you must use an advanced OBD-II scanner capable of reading proprietary GM transmission sub-codes (like P0776 for solenoids or P0613 for processor faults).