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Answer to Any 4L60E Problem

Old 05-10-2014, 10:10 PM
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Default Answer to Any 4L60E Problem

This thread went sticky on GMT400.com and has served people well so i will post it on here.



NOTE:The transmission is on the same fuse as the MAF, O2 sensors and at least one other sensor - if an O2 shorts out, it will blow the fuse and the trans will go into limp-home mode. Be sure the trans has power and the fuse is not blown before doing anything else.

Secondly, put a line pressure gauge ($55 shipped on Ebay, or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" boost valve (easy fix in pan).

Beware of coolant contamination - coolant will cause clutch packs to delaminate and thus cost you a rebuild! Trans fluid eats radiator hoses! If you find any sign of cross contamination, fix the problem and thoroughly flush both systems IMMEDIATELY.

What is "limp-home mode" ? This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.

R&R = Remove & Repair (or Rebuild) = Transmission must be removed to fix the problem and may have to be rebuilt or replaced.

Common failures on 4L60E, symptom < cause > any possible repair:
1. Slow, slipping or no reverse: “lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell. It is possible to remedy a fluid problem by removing the checkball from its cage in the case in the rear of the trans may help (must remove valvebody), or adding a high-viscosity additive such as Lucas Transmission additive or other seal restorer product. May also have worn boost valve (can replace in the pan).
2. 1-2 shift does not happen at WOT until you let off the gas: Best case: try replacing the TPS. Middle case: leak in the 2nd gear apply circuit (servo assembly or 1-2 accumulator). Doublecheck by using the pressure gauge and watch for a big drop when the PCM commands 2nd gear. Worst case: poor line pressure rise (see below).
3. 1-2 Shift shudder at WOT; delayed or abnormal 1-2 shift; There's a problem ONLY on the 1-2 shift: 1-2 accumulator piston cracked or stuck cocked in the bore. Check the yellow spring inside the accum housing for breakage. Also, if the accumulator housing walls are scored, the housing must be replaced. Easy fix in the pan.
4. 1-2 shift is delayed and harsh, may not shift into OD: Check TPS for smooth and linear electrical response over the entire range of motion. If not, replace.
5. Trans does not upshift out of first, speedometer reads zero at all times: VSS failure. Easy fix on rear of transmission, but xmember must come out to access VSS.
6. No 3rd or 4th gear: “3-4” clutches are worn out. R&R. The car is safe to drive (in 2) until you can get it fixed.
7. Sudden grinding noise with no prior warning primarily in 2nd gear, behavior in reverse may be abnormal; sunshell is fractured. R&R. Try not to run or drive the car or further damage could result.
8. 1st and 3rd only, no 2,4 or R; sunshell is fractured or splines are sheared off. R&R. Try not to run or drive the car or further damage could result.
9. No 2nd or 4th gear. 2-4 band is slipping. Servo seals may be damaged (can be fixed without removing trans. Otherwise, 2-4 band is worn out. R&R.
10. Trans shifts into gear harshly, car feels sluggish off the line, No 1st, 4th or TCC lockup available, Manual 2nd, 3rd and Reverse are only available gears, CEL is on: Transmision is either in limp-home mode or has lost electrical power. If there are lots of error codes in the PCM, check the underhood fuse that powers the transmission, and if it pops again, look for a short in that circuit like an O2 sensor harness touching exhaust. Otherwise, check PCM codes for a particular fault in the transmission causing the PCM to put it in limp-home mode.
11. No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD and locks the converter : ShiftA solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.
12. Car goes into gear but feels very sluggish like the brakes are dragging, but it will roll easily (starts out in 4th gear), you manually shift to 2 to get it moving, once it's moving you put it back in OD and the car shifts 3rd to 4th on its own and locks the converter at the appropriate time: ShiftB solenoid failed: Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.
13. No TCC lockup: Brake pedal switches improperly adjusted (always on), TCC solenoid failed (easy fix in the pan), TCC clutch worn out (must remove trans and replace TC).
14. TCC always locked: TCC apply solenoid circuit shorted to ground, TCC solenoid blockage (easy fix in pan), or TC broken (must remove trans and replace TC).
15. Horrible noise in 4th and feels like the brakes are on: overrun clutches are applying due to a cracked or leaking forward piston. Overrun clutches will be worn out after 30 seconds of this behavior. Car can be safely driven in D. R&R.
16. Soft shifting, gradual performance degradation: Poor line pressure rise due to leaking boost valve, clogged EPC filter screen, failing EPC solenoid, or worst case: leaky seals throughout. Transgo HD2-C kit fixes first two without removing trans. Seal restorer may fix last problem, but probably R&R. Also try a transmission flush with BG brand products (Firestone stocks it).
17. No forward movement in OD or D, but L2, L1 and R work: Forward sprag is broken. R&R. Try not to run or drive the car or further damage could result.
18. Extremely harsh shifts from P or N, normal shifts at WOT: EPC (Electronic Pressure Control) solenoid failed. Easy fix in pan. Fix as soon as possible or hard parts will eventually break.
19. Loud bang, grinding sound, loss of all gears, and a binding driveshaft: snapped output shaft. Try to wiggle driveshaft - if more than 0.020" play, that's the sign. R&R.
20. Trans seems noisy when moving in 1st and Reverse, noise goes away instantly if you shift to N or the trans goes into 3rd gear: Reaction planetary is worn out due to high miles or insufficient lubrication. Not a critical failure, but not a good sign either. R&R sooner rather than later.
21. No movement in any gear: pump failure, or total loss of fluid. R&R, or refill pan and find the leak. If out of fluid, avoid running the engine until the trans is refilled to avoid pump damage. To check for pump failure, check fluid level with the engine off, then start the engine and recheck fluid level. If level does not go down when engine is running, the pump is broken.
22. Transmission does not shift automatically, only manually. Swap in a known-good PCM, check wiring, check other sensors such as VSS and TPS.
23. 3rd gear starts, can manually shift through all gears. When car has been turned off for a bit, then back on it will run normally.: VSS dropoff w/ Hi-stall converter. The rpms are too high, but VSS is showing no movement. Happens after a tire burning take-off. Doesn't store a code, will not throw a CEL (I've heard that it will store a code if it happens 3 or more times). Cure: Reprogram PCM for VSS dropoff -- PCMforLess knows about it.
24. Fluid leak out of the front of trans where the converter connects; partial or full loss of movement: Front pump bushing walked out. R&R. May have to replace converter also if hub is scored. Note that a leaking front seal usually means the bushing is walking out (i.e. call your local trans shop and schedule an appt.).
25. Torque converter shudder in 4th while lockup is engaged; problem goes away when the brake pedal is pressed slightly to unlock converter. Have a shop verify line pressure, and provided no valves in the TCC hydraulic circuit are worn, replace the torque converter. Also, Lubegard Shudder Fix will at least fix this for awhile. Or try a transmission flush by a shop that uses BG brand products.
26. Shift suddenly become very hard. When going from park to either reverse or drive it slams into gear. 1-2 and 2-3 shifts are also harsh. All gears seems to work. Problem may be intermittent: Check TPS for smooth electrical response. If the response is jumpy or erratic at all, replace TPS.
27. All fluid pumped out through the vent tube: Plugged cooler line. Flush the transmission cooler and cooler lines. Also could be overfiled transmission.
28. Car acts like it's in OD in neutral, car is locked stationary in R, engine feels loaded in P, all four forward positions work fine: R&R: Internal crossleak feeding the forward clutches all the time. Most likely a cracked input housing, or cracked forward piston means forward clutches are fused together. Car can safely be driven gently in forward gears until the repair.
29. Needle bearings in the pan, first gear and/or reverse may be noisy: Either a torrington bearing or a planetary bearing is on its way out. Trans will eventually die a loud, catastrophic death. Cheaper to rebuild now (saves further damage to hard parts), but requires R&R. It is drivable until it breaks.
30. 1-2 or 2-3 shift is slow/soft above part throttle: Trans is on its way out. R&R.
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Old 05-11-2014, 07:35 PM
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Useful, thanks.
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Old 05-11-2014, 09:06 PM
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im hoping it will help more people, its the number 1 transmission thread on a couple other forums
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Old 06-30-2014, 08:30 PM
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I see that if 3rd and 4th are out on your list that it is an internal problem and has to be rebuilt. And you said the solenoids control 1-4 and 2-3. I thought that they controlled 1-2 and 3-4. Anyway...

My 3 and 4th went on vacation and on 1st and 2nd were available. Service engine soon on and no slipping was ever detected. The transmission did not even act as it was trying to shift. so i replaced the solenoids (both, why only replace one) and this fixed the problem. I have been driving it for about two weeks and then again it just did not shift into 3rd or 4th. Next day it worked fine??? again no slipping detected. I know the car has a lot of miles, 161,XXX but slipping was not felt at all. and I would think you would hear it shifting as well.

any help would be appreciated.
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Old 08-17-2014, 11:15 AM
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For what it's worth, I've always shifted mine manually (both up and down) - takes a little practice to get the timing right, and just go ahead and jump from 2 to 4 because 3rd hates to grab.

Benefits after 187k miles:
1. Only replaced brakes twice
2. Changed filter 3 times with nary a sign of wear or burnt fluid
3. Still chirps the tires on the 1-2 shift without much effort
4. Makes the rice burner boy in the next lane at the light think twice about being a dumbass when the LS1 belches as it drags you to a stop and scars the **** out out of him (provided the a/c isn't turned on).

Not saying the tranny's as good as new, but it's still got its *****, even after 10 years of running the hell out of it in the Santa Cruz Mountains on weekends and commuting 2-3 hours each way for a 50 mile round trip M-F through the Silicon Valley (glad I finally got the hell out of there). Manually shifting puts CONSIDERABLY less wear on an automatic because there's a lot less slippage.
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Old 08-17-2014, 11:17 AM
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Silver: get a code reader on it and see what it says. Also might be worth dumping some Lucas in and seeing if it makes a difference.
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Old 08-27-2014, 05:33 PM
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I copied and pasted this info to a doc. on my computer, very useful info, thanks!
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Old 09-02-2014, 03:25 PM
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Default weird trans problem

quick question 94 formula firebird LT1 4L60E. Blew the ring and pinion the other day, put in a new one and now the trans wont do anything in D or 3 position but i can shift it manually and it goes fine like nothing happened. Torque locks also. Wont downshift when in D or 3 Position ither. Any ideas
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Old 09-02-2014, 03:38 PM
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If the car will not start in [D3] or [OD], but will start in [D1] or [D2] and you can manually shift at speed to [D3] and then [OD], this almost certainly indicates that the forward sprag has failed. This unfortunately also often contaminates the entire trans, converter and cooler with metal fragments.
Are you sure your ring/pinion failed? Perhaps it was the trans and it was misdiagnosed.
Or just really bad luck for both to fail.
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Old 09-02-2014, 03:46 PM
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definetly was ring and pinion had replaced it myself. After i replaced the ring and pinion it wouldnt do anyting in D or 3 but would shift fine as a manual
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Old 05-15-2017, 11:10 PM
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Default 4l60e issue no one can solve

I have a 95 with a 4l60e. Trans will go into reverse and first when cold. When it starts to shift it looses all gears. If i shut off the key and restart i have 1st and reverse most of the time. Sometimes it will shift thru all gears but when i stop it tries to take off in 2nd. If i shift to 1st manually it will downshift. Then i put it in od and it shifts fine till i stop again. Very erratic.
​​​​​​​please help
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Old 05-20-2017, 03:40 PM
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If the car won't move with the shifter in D3/OD, but will move with the shifter in D1 and then lets you manually upshift, this is the exact symptom of a bad forward sprag.
There have been various reports of sprags acting intermittently before they finally fail.

However your additional comment "when i stop it tries to take off in 2nd" is not consistent with that. First I suspect it is actually trying to start in 3rd gear which is limp mode; a scanner should then show the reason for limp mode. I don't know for sure if a slipping sprag will cause a code (and limp mode), but it seems plausible.

The '95 4L60E (which I call the beta-test version) had various weaknesses including a weak forward sprag. Be glad it lasted 22 years!
Unfortunately due to a unique year electrical setup and PCM, you cannot replace it with any other year. Probably best to get it rebuilt. The sponsors can probably provide a '95 or could certainly rebuild yours for performance.
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Old 07-30-2018, 07:17 PM
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Default Need help!

I NEED HELP! I have a 2000 Silverado z71 4x4 5.3. I took the bad 4l60 out and I have a donor truck exactly the same that I drove to the garage that shifted perfectly. So I put the transmission in mine changed the fluid and now it won't move. If I redline it, it will creep forward a little. I don't get it worked perfectly in the other truck. I've checked all the connections. Any advice would be greatly appreciated
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Old 07-30-2018, 08:40 PM
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Justin, did you use the same torque converter from the good one? Perhaps you didn't get the converter fully seated into the pump when you installed the good one?
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Old 07-31-2018, 08:12 AM
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Originally Posted by justin kitelinger View Post
I NEED HELP! I have a 2000 Silverado z71 4x4 5.3. I took the bad 4l60 out and I have a donor truck exactly the same that I drove to the garage that shifted perfectly. So I put the transmission in mine changed the fluid and now it won't move. If I redline it, it will creep forward a little. I don't get it worked perfectly in the other truck. I've checked all the connections. Any advice would be greatly appreciated
Does the fluid level go down on the dipstick when you start the engine? It sounds as if the pump is broken. You both should start your own thread.
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Old 07-31-2018, 04:24 PM
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Great post, can confirm how nasty a cross-contam cooler failure can be. RIP to my Tundra ;(
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Old 09-19-2018, 07:23 AM
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I don't see this one on here:
Car went to shift into third at the track, made a bang and lost 1st and 3rd gear.
I was able to manually start in 2nd and shift to 4th with lockup to get back to the pits.

Last edited by BigPlanTransAm; 09-19-2018 at 07:41 AM.
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Old 09-19-2018, 02:59 PM
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Lost 1st/3rd, retained 2nd/4th: range chart tells me 2/4 band is stuck on.
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Old 09-19-2018, 06:59 PM
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Here's the real answer to any 4l60e problemsAnswer to Any 4L60E Problem-photo633.jpg
Get a 4l80e
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Old 09-19-2018, 09:19 PM
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The only answer to a 4L60E is a different transmission.
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