Silverado 6L80 Transmission Faults How to Fix P0741, P0776, P0700

Silverado 6L80 Transmission Faults: How to Fix P0741, P0776, P0700 and More

Why Your Silverado 6L80 Shifts Like It’s Towing Uluru?

Please read our Professional Guide to Fault Codes, Failures, and Proper Fixes for your Silverado 6L80 Transmission.

The Chevrolet Silverado is big. Big enough to cause shade issues in suburban car parks and big enough to make lesser utes reconsider their life choices. But despite all that size and American bravado, inside it lives a transmission that simply wasn’t designed to endure endless punishment without consequences. The 6L80 automatic gearbox is well-known in the transmission world for a few things. Smooth shifts when new. Premature failures when worked hard. A love affair with fault codes like P0741, P0700, and P0776.

If you’ve landed here because your Silverado is lurching, slipping, or flashing fault codes like a Christmas tree, welcome. Brisbane Tuning & Turbo knows this transmission inside out. Below you’ll find a proper breakdown of why these codes happen, what they mean, and how we fix them so your Silverado drives the way it should — even if it’s towing something the size of a small house.

Silverado 6L80 Torque Converter & TCC Faults P0741

The Lock-Up That Never Happens, Or Never Ends…

Let’s start with the most common complaint. P0741. This is the classic 6L80 torque converter clutch fault. It means the TCM (Transmission Control Module) wants the converter clutch locked, but it isn’t locking. Without lock-up, you get heat, slip, poor fuel economy, and eventually converter failure. The reasons are simple. Fluid shear. Worn clutch linings. Valve body cross-leak. Sometimes a solenoid. Brisbane Tuning & Turbo confirms this properly with dyno and or road testing and live pressure readings. The fix is clear. Replace the converter. Rebuild the valve body properly. Re-establish line pressure integrity.

P0742

P0742 is the opposite but just as frustrating. This fault tells you the converter clutch is staying locked when it shouldn’t, giving you take-offs that feel like you’ve left the handbrake on. The culprit is usually debris, a sticky valve, or a solenoid issue. The solution is cleaning, replacing what’s faulty, and verifying proper operation under load.

P0744

P0744 is intermittent torque converter clutch faults. Classic early wear signs in a 6L80. It’s often wiring, a dying solenoid, or hydraulic integrity starting to slip. BTT’s job here is diagnosis first, replacement second.

P2757

P2757 is a pressure control solenoid fault. Specifically, the solenoid is stuck applying converter pressure when it shouldn’t. This creates weird shift timing, poor drivability, and excessive converter wear. The solution is replacing solenoids, inspecting the pump, and confirming there’s no cross-leak in the valve body.

Pressure Control & Solenoid Faults 

P0776, P0777, P0796, P2714, P2723

The Hydraulic Gym Membership Has Lapsed…

Solenoids are the traffic controllers of automatic transmissions. P0776, P0777, P0796, P2714, P2723. These codes all scream one thing. Hydraulic pressure isn’t being controlled properly. Sometimes the solenoids are stuck. Sometimes, they’re simply reporting incorrect data due to valve body bore wear and cross-leakage. When this happens, you’ll get harsh shifts, no shifts, or the infamous “stuck in one gear” limp mode. Fluid contamination and heat cycles kill these components slowly but surely. BTT doesn’t just replace the solenoids. We fix the reason they failed. Separator plates wear. Gaskets leak. Bore wear robs circuits of pressure. We rebuild these areas properly with upgrades, not just replacements.

Sensor Faults P0711, P0715 and P0717

Because Guessing Gear Speeds Never Works…

P0711 is your fluid temperature sensor out of range. This isn’t always the sensor’s fault. Sometimes it’s cooked fluid telling lies. Sometimes it’s a genuine electrical fault. Either way, BTT replaces sensors with genuine parts, inspects the harness, and confirms cooling efficiency.

P0715 and P0717 concern the input speed sensor. P0722 the output speed sensor. P0791 the intermediate shaft sensor. These sensors are crucial. They tell the TCM what’s spinning and how fast, so it knows when to shift. When they fail, your Silverado shifts badly or locks itself into limp mode. BTT replaces them, tests them properly, and confirms function with live data and dyno verification.

Call us 0732767969 to Book your Silverado 6L80 Transmission Repairs.

Range Sensor & PRNDL Faults

When Your Gear Lever Has an Identity Crisis

P0700 isn’t a fault on its own. It’s a message from the TCM to the ECM saying, “Hey mate, go check the other codes.”

P0706, P1915, and P182E point to your internal mode switch. This is what tells the TCM what gear you’ve selected. When it fails, things get messy. No start, stuck in gear, random shift behaviours. Contamination, wear, and fluid ingress kill these components. Brisbane Tuning & Turbo replaces them, seals them properly, and confirms operation before calling the job done.

Line Pressure & Pump Faults

When Hydraulic Force Goes on Holiday, well sort of…

P0931, P0960, and P0961 are all line pressure-related. Either there’s too much pressure or not enough, and neither is good news. Pump wear, especially in the stator bush, causes these issues. Valve body wear doesn’t help. Too much pressure means harsh shifts. Too little means flares and slipping clutches. Brisbane Tuning & Turbo inspects pumps, rebuilds them with proper upgrades, replaces bushings, and ensures line pressure is where it should be. We verify this through testing, not guesswork.

Why This Happens To Silverado 6L80 Transmissions?

Silverado owners tow. Boats, caravans, bobcats, shipping containers, and probably a sense of self-worth tied to having the biggest ute in the carpark. The 6L80 wasn’t designed to live at 110 degrees Celsius pulling 3.5 tonnes through the hills of Queensland every weekend. Fluid breaks down. Clutches slip. Pressure circuits leak. Even the best servicing won’t undo basic physics. These transmissions fail because they’re overworked and undercooled. That’s not an insult. It’s reality. If you tow, you’re at risk. If you drive around with big wheels and no transmission cooler upgrade, you’re definitely at risk.

How Brisbane Tuning & Turbo Fixes Silverado 6L80 Transmissions?

We don’t guess. Instead, we scan. We dyno. We measure. Make sure & verify. We replace what’s broken, rebuild what’s worn, and upgrade what was underbuilt from day one. Our valve bodies get the best manufacturers’ upgrades. We don’t use cheap parts. Our converters are re-lined, upgraded, and built for torque. At Brisbane Tuning & Turbo, our solenoids are new, not salvaged. Our pumps are rebuilt to spec, not “she’ll be right” back together.

Everything is tested post-repair on our dyno, road tests, and under load, to ensure what you get back works as it should. We don’t offer Band-Aids. We offer solutions that last. That’s why Brisbane Tuning & Turbos is trusted by owners who actually use their Silverados the way GM promised but never properly prepared them for.

Final Thought: Big Ute, Big Problems, Smarter Fixes

Silverado 6L80 Transmission -Your Silverado is big. Really big. But inside that hulking chassis is a transmission with tiny hydraulic circuits that hate heat, hate wear, and hate towing abuse. Those fault codes aren’t random. They’re your transmission telling you science is catching up with ambition. Bigger isn’t always better. Smarter is. That’s why Brisbane Tuning & Turbo exists. Click here to read about Automatic Transmission diagnostics or complete the form below. Call us 0732767969 to Book your Silverado 6L80 Transmission Repairs.