6L90 Pressure Control Solenoid

If you are searching for a 6L90 pressure control solenoid because a 2007-2013 Silverado or Sierra 2500HD/3500HD, Express or Savana van has a stuck line pressure, a harsh or soft shift, or a P0962/P0963 on the scan tool, you have probably already found out that GM does not sell that solenoid by itself. On the 6L90 the line pressure solenoid, the four clutch pressure control solenoids, both shift solenoids and the pressure switches are all built into one control solenoid valve assembly with the transmission control module riding on top of it. GM calls the electronic half the TEHCM. This listing is that complete assembly, remanufactured, with the solenoids installed.

What the pressure control solenoid does in a 6L90

Pressure Control Solenoid A, GM's Line Pressure VBS, is a variable bleed solenoid. The module ramps its current to set main line pressure, and every clutch in the 6-speed is applied from that line pressure through its own regulator valve. In a heavy-duty truck that tows, the line pressure solenoid is what lets the transmission clamp the clutches harder under load. The other four variable bleed solenoids (PC B through E) each feed one clutch circuit: 3-5-Reverse, Low-Reverse/4-5-6, 2-6 and 1-2-3-4. Because they share a body and a circuit board, a failure in one usually means replacing the assembly.

Symptoms that point at the solenoid assembly

• Line pressure that sits around 60-68 psi with no rise when you open the throttle, and reads the same with the connector unplugged
• Soft, slipping upshifts that get worse with load or heat
• Harsh garage engagement into Drive or Reverse
• Circuit codes P0962/P0963 (line pressure solenoid) or P0973/P0974 and P0976/P0977 (shift solenoids A and B)
• Clutch pressure control stuck-off codes P0776, P0796, P2714 or P2723, usually with a harsh-shift complaint because the module commands maximum line pressure as a default
• Pressure switch codes such as P0872 or P0877 alongside a solenoid code

How to confirm before you buy

Put a gauge on the line pressure tap. A solenoid stuck in exhaust shows the flat 60-68 psi reading with no rise, unplugged or not. Separate circuit codes (the module reporting an electrical fault) from performance codes (the hydraulics not doing what was commanded); a performance code is often a worn clutch regulator bore or a sticking clutch select valve, not a bad solenoid. Our 6L90 shift solenoid testing guide walks through every code and its default action, and the valve body testing guide covers the bore wear that impersonates a solenoid failure.

Fitment

This remanufactured assembly is listed for the 6L90 from 2007 through 2013. That covers the 2007-2013 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD, the 2008-2013 Suburban 2500 and Yukon XL 2500, and the 2010-2013 Express and Savana 2500/3500/4500. The same assembly family was also used on the 2008-2010 6L80 and 6L50 and the 2010 6L45, but do not assume interchange on your truck. Match the part number on your old TEHCM, confirm the RPO code MYD on the glovebox or door label, or send us the year and VIN and we will check it. Browse all 6L90 parts if you need the later 2014-2017 version.

Install notes

• The TEHCM must carry the correct software for your VIN. Plan on programming it with a GM-capable scan tool after installation; a wrong part number or wrong program file can cause a no-movement or no-upshift condition.
• A temporary no-move can occur during programming or relearn. Remove the scan tool and key, open and close the driver door, and wait 15 to 20 minutes before trying again.
• Install a new TEHCM filter gasket. Leaving it out causes no movement with low or no line pressure.
• Refill with Dexron VI. GM lists a 6.0 quart fluid change capacity for the 6L90; check level hot with the engine running.
• Run the transmission adaptive learn procedure so the clutch fill values reset to the new solenoids.

If the scan data and the gauge point to the valve body castings rather than the electronics, the 6L90 valve body is the better buy. If the fluid is dark or full of friction material, inspect the pump first; the 6L90 pump is a common companion repair when debris has scored the pressure regulator bore.

Can I buy just the 6L90 pressure control solenoid by itself?

Not from GM. On the 6L90 the line pressure solenoid, the clutch pressure control solenoids, the shift solenoids, the pressure switches and the control module are one assembly. This listing is that full remanufactured assembly with the solenoids installed.

Which years and trucks does this fit?

It is listed for the 6L90 from 2007 to 2013, which includes Silverado and Sierra 2500HD/3500HD, Suburban and Yukon XL 2500, and the 2010-2013 Express and Savana. Match the part number on your current TEHCM or send us your year and VIN to confirm before ordering.

Does it need to be programmed?

Yes. The module must have the correct software for your VIN. Program it with a GM-capable scan tool after installation, then run the transmission adaptive learn so shift quality settles in.

My line pressure is stuck at about 65 psi. Is that the solenoid?

It is the classic sign of a line pressure solenoid stuck in exhaust, especially if the reading does not change with the connector unplugged. If line pressure is normal and you have a solenoid performance code instead, check the clutch select valves and regulator bores first.

What fluid do I use after installing it?

Dexron VI. GM lists 6.0 quarts for a 6L90 fluid change; set the final level with the transmission hot and the engine running.

• 6L90 Shift Solenoid Symptoms, Testing and Replacement
• 6L90 Valve Body Problems: Symptoms, How to Test, and Replacement
• 6L90 Common Problems and Fixes: Six Failures That Actually Show Up
• 6L90 Silverado 2500 Shift Problems: Diagnosis and Fix