6L80 Camaro Common Problems and Fixes

The 6L80 in a fifth-generation Camaro lives a very different life from the same transmission in a Silverado. Nobody hooks a camper to an SS. What it gets instead is wide-open-throttle launches, long pulls through the gears, Tap Shift abuse, cold-start blasts down the street, track days, and a lot of owners and shops who are ready to tear it apart the first time it does something they do not like. Some of the Camaro complaints I hear are real failures. A surprising number are a normal characteristic GM has already put in writing, or a problem that a previous repair caused.

This post sticks to what GM and recognized transmission authorities have published that covers the 2010-2015 Camaro. For the transmission-wide failure list (TCC, pump, 3-5-R drum and the rest), see our 6L80 common problems guide. If your Camaro is an earlier body with a four-speed, the 4L60E Camaro problems post is the one you want.

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First: Which Six-Speed Is in This Camaro?

This matters more on a Camaro than on almost any other 6L80 vehicle, because one body style carried three different versions of the same family. GM's PIP5429A lists the 2010-2015 Camaro with transmission RPOs MYB, MYC and MYD. MYB is the 6L50, MYC is the 6L80, and MYD is the 6L90. The Camaro owner manual's capacity chart tells you which engines got the automatic: the 3.6L V6 (LFX in 2012) with the six-speed automatic, the 6.2L V8 L99 with the automatic in the SS, the LS3 only with the manual, and the supercharged LSA in the ZL1 with either. In practice that means the V6 automatic is a 6L50, the SS automatic is the 6L80 behind the L99, and the ZL1 automatic is the 6L90.

Do not guess from the badge. Read the Service Parts Identification label for the RPO before you order a single part, because the valve body, the case length and several internal parts depend on it. If you have the V6 car, our 6L50 fluid type and capacity post covers its service. The 2016-up Camaro is a different transmission family altogether, so nothing below applies to it.

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1. The Cold 2-3 Flare (Usually Not a Problem)

What the owner says: the first time they drive the car in the morning, the 2-3 shift slips or the revs flare for a moment. After that it is fine. Or it only happens on cold days.

What GM says: PIP5429A covers a 2-3 upshift slip or flare and lists the 2010-2015 Camaro with all three of its six-speeds. GM recognizes two versions of it. The first happens on the first 2-3 upshift after the car has sat with the engine off for several hours, and GM says it may be caused by air trapped in the 3-5-R clutch assembly. That first shift purges the air and the following 2-3 shifts are normal. GM notes that shifting into Reverse before Drive will purge the air and prevent the flare. The second version happens when ATF temperature is at or below 85°F (30°C) and goes away as the fluid warms.

The fix: for the cold version, GM has the tech note the throttle position where the flare happens on the scan tool, drive the car until ATF is at least 104°F (40°C), then make several 2-3 shifts at that same throttle position so the adapts can tailor the shift. The bulletin says, more than once, that this is a normal characteristic, that it will not cause durability concerns, and that no repair attempts should be made.

Where people go wrong: a Camaro owner who hears "2-3 flare" on a forum and assumes a failing 3-5-R drum. A flare that only shows up on the first shift or below 85°F and is gone once warm fits the bulletin. A flare that is there hot, gets worse over time, or comes with a slip code does not, and that is when you look at the 3-5-R circuit. Our 6L80/6L90 3-5-R clutch failure post covers the real failure.

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2. No Reverse and No Second After a Valve Body Job

What the owner says: the car had a valve body or TEHCM replaced, and now it has no reverse and will not take second. Sometimes the speedometer acts up too.

Why it happens: GM's bulletin 16-NA-130 lists the Camaro among the 6L45, 6L50, 6L80 and 6L90 vehicles where, after a replacement upper valve body is installed, the transmission may have no reverse and no second gear, and in some cases the input speed sensor (ISS) and output speed sensor (OSS) signals may be missing. GM says the likely cause is the wrong upper valve body. The oil passages that feed the center support, which carries the low and reverse clutch and the 2-6 clutch, are in different places on each transmission, and so are the ISS and OSS mounting locations. Put the wrong valve body on and the feed holes and sensors do not line up.

How to check it: every upper valve body has four posts on top labeled A, B, C and D. Per 16-NA-130, the post matching the correct RPO is milled off: a milled A is MYA, B is MYB, C is MYC and D is MYD. An SS 6L80 needs the C post milled. A ZL1 6L90 needs D. Sonnax's tech staff add an important warning: a 6L80 valve body will bolt onto a 6L90 case and the other way around, so the fact that it fit proves nothing, and some valve bodies have no machined boss at all, so compare the center support hole locations too.

This one hits Camaros harder than trucks for a simple reason: three versions of the transmission were sold in the same car, and a used or reman valve body listed "fits 2010-2015 Camaro" may be for the wrong one. If the no-reverse showed up with no valve body work, Sonnax lists other causes to check: a misplaced number 5 checkball, the wrong separator plate or gaskets, a snap ring that is not indexed correctly, cracked welds in the 3-5-R drum, a stuck 3-5-R clutch regulator valve, or a solenoid problem in the TEHCM. Our 6L80 no reverse fix post walks through those in order.

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3. Heat and Hard Driving

Here is the Camaro fact most owners and plenty of shops have never seen. In the 2015 Camaro owner manual's maintenance schedule, the normal chart does not list an automatic transmission fluid change at all through 150,000 miles. The severe chart lists "change automatic transmission fluid and filter" at 45,000 miles (72,000 km), 90,000 and 135,000. And GM's severe list includes vehicles mainly driven in heavy city traffic in hot weather, in hilly or mountainous terrain, frequently towing, used for taxi, police or delivery, and, the one that matters here, used for high speed or competitive driving.

So a Camaro SS that sees a drag strip, an autocross, a track day or just regular hard pulls is a 45,000-mile car by GM's own definition. Most of them were never serviced at all, because the owner read "no service required" off the normal chart. Repeated full-throttle shifts heat the clutch packs and the fluid at the same time, and hot, worn fluid is behind a lot of the slips and flares that eventually do turn into real failures.

Watch the messages the car gives you. The Driver Information Center will display TRANSMISSION HOT IDLE ENGINE with a chime when the fluid gets hot. GM's manual says driving with high transmission fluid temperature can damage the vehicle, and to stop and let it idle until the message clears. SERVICE TRANSMISSION means the TCM has found a fault and the car needs a scan, not a fluid top-off. And SHIFT DENIED is not a fault at all: it is the car refusing a manual-mode downshift to a gear that would over-rev the engine.

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4. The Sealed Fill and Botched Fluid Services

The Camaro has no transmission dipstick. The owner manual says it plainly: the vehicle is not equipped with a transmission fluid level dipstick, there is a special procedure for checking and changing the fluid, and because that procedure is difficult it should be done at a dealer or by following the service manual. GM also says it is not necessary to check the level in normal use, because a leak is the only reason for fluid loss.

That is where a lot of the trouble starts. A quick-lube or a DIY owner who pulls the pan, guesses at the fill and never runs the level set procedure ends up low or overfull. Low on a 6L80 means aerated oil, flares and slips. Both the 2012 and 2015 manuals list the automatic at 6.3 L (6.7 qt) for pan removal and filter replacement, V6 and V8, and specify DEXRON-VI. Treat 6.7 quarts as the starting point and set the final level by the service procedure, at the right temperature, with the engine running.

The filter seal. GM bulletin 23-NA-224 lists the Camaro among the vehicles using the 6L50, 6L80 and 6L90 filter and seal kit, part number 24236933, which GM is moving to separate parts: filter 24236517 and seal 24225347. Per the bulletin, service procedures require the seal to be replaced every time the filter is removed. If somebody reused the old seal, or left it stuck in the pump bore and pushed a new filter in on top of it, the filter can draw air. Check for that first on any Camaro that started flaring, whining or engaging late right after a fluid service. Our 6L80 fluid type and capacity post has the full service walk-through.

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5. The ZL1 Is a 6L90, Not a 6L80

A lot of "6L80 Camaro" parts searches are actually ZL1 owners, and the difference matters. Sonnax notes that the 6L90 case is about 1-3/8 inches longer to house stronger input and output gearsets, that it uses a different output shaft, and that roughly 25 percent of its internal parts were upgraded for torque capacity. A lot of hard parts and soft parts do interchange between the two, which is exactly why people get caught: the valve body bolts on either way (see problem 2), and gearsets, output shafts and case-length parts do not cross over.

If you are rebuilding a ZL1 automatic, buy against the MYD RPO, not "Camaro 6L80." The 6L80 vs 6L90 differences post lays out what swaps and what does not.

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A Quick Diagnostic Order for a Camaro Six-Speed

1. Read the RPO on the Service Parts Identification label: MYB, MYC or MYD. Order nothing until you know.
2. Ask how the car is driven. Strip, track or regular hard pulls means severe service: fluid and filter every 45,000 miles. Ask when it was last done, if ever.
3. Scan for codes and note any DIC message. SHIFT DENIED is normal; SERVICE TRANSMISSION needs a scan; TRANSMISSION HOT IDLE ENGINE means stop and cool down.
4. For a 2-3 flare, note ATF temperature. First shift of the day or at or below 85°F fits PIP5429A: do the warm adapt drive, not a teardown.
5. For no reverse and no second after valve body work, pull the pan and check which post is milled on the upper valve body per 16-NA-130.
6. For problems that began right after a fluid service, check the level by the set procedure and confirm the filter seal was replaced per 23-NA-224.

FAQ

What transmission does a 2010-2015 Camaro SS automatic have?

The SS automatic is the 6L80, RPO MYC, behind the 6.2L L99 V8. GM's PIP5429A lists the 2010-2015 Camaro with three six-speeds: MYB (6L50) in the V6, MYC (6L80) in the SS and MYD (6L90) in the supercharged ZL1. Check the RPO on the Service Parts Identification label before ordering parts.

Why does my Camaro flare on the 2-3 shift when it is cold?

GM's PIP5429A covers a 2-3 flare on 2010-2015 Camaros that happens on the first shift after the car has sat for hours, from air trapped in the 3-5-R clutch, or when ATF is at or below 85 degrees F. GM calls it a normal characteristic and says no repair attempts should be made. Shifting into Reverse before Drive purges the air, and a warm adapt drive can help the cold version.

How often should a Camaro 6L80 get a fluid change?

The 2015 Camaro owner manual's normal schedule lists no automatic transmission fluid change through 150,000 miles. The severe schedule lists fluid and filter at 45,000, 90,000 and 135,000 miles, and severe service includes high speed or competitive driving, heavy city traffic in hot weather, hilly terrain and towing. A Camaro that sees hard pulls or the track belongs on the 45,000-mile schedule.

How much fluid does a Camaro 6L80 take and how do you check it?

GM's 2012 and 2015 Camaro owner manuals list 6.3 L (6.7 quarts) of DEXRON-VI for a pan removal and filter replacement. There is no dipstick; GM says the level is checked and set with a special service procedure. Use 6.7 quarts as the starting point and set the final level by that procedure.

Why does my Camaro have no reverse after a valve body replacement?

GM bulletin 16-NA-130 says no reverse and no second after an upper valve body replacement may be caused by installing the wrong upper valve body. Each one has posts labeled A through D, and the milled post shows the RPO: C for the 6L80 (MYC), D for the 6L90 (MYD). The center support feed holes and speed sensor locations differ between transmissions, so the wrong valve body will not line up.