FYI 4L60E common problems / failures - Chevy Impala SS Forum
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Old 08-07-2009, 06:42 PM
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Default FYI 4L60E common problems / failures

Last updated: 1/19/2010. This entire thread and all of the individual items were created by Sherlock9c1 of the Impala SS Forum. If you see this list anywhere else on the internet, it was copied from here. If you're going to steal it and post it on your site, please do the right thing and at least give attribution. There at least 5 other websites that have posted this unattributed.

Before guessing at transmission problems, check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST. This guide is meant for problems that do not show up as PCM codes (like shift A&B solenoid failures, for example).

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.

Also note that many problems that show up as transmission issues are actually PCM or electrical, and may be external to the transmission. Try a different PCM, and check for chafing where the cables come out of the PCM and touch the LF fenderwell.

ALL ELECTRICAL PROBLEMS ON THE B/D-BODY 4L60E CAN BE FIXED WITHOUT REMOVING THE TRANSMISSION.

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 Sonnax boost valve (easy fix in pan).

Beware of coolant contamination - coolant will cause clutchpacks 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" ? That is the street slang term for a fault mode in which the PCM cuts power to the transmission. 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, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal 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 help 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 this by removing the pan).
2. 1-2 shift does not happen at WOT until you let off the gas: If you're lucky, it's a 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) and the transmission is worn out. This is the most likely case.
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. This content created by Sherlock9c1 of the Impala SS forum. 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. The content of this webpage was created by Sherlock9c1 and originally posted on the ImpalaSSforum.com.
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.). check.
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.
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.
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Quote:
Originally Posted by Rocko350 View Post
Go fix your fleet of 91's. I wipes my tushy with TBI.......
Quote:
Originally Posted by Needles.Kain View Post
Much like date night with BK, this isn't about what you prefer.

Last edited by sherlock9c1; 10-05-2012 at 04:01 AM.
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  #2  
Old 08-07-2009, 06:53 PM
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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.
31. Funky rattling noise and shudder when the TCC is locked. Could be hairline cracks on the torque converter's pump drive hub. You would have to remove the converter to see this damage. See here. The fix is to replace the converter.



Posted by sherlock9c1, i just saved the sticky

thanks
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Quote:
Originally Posted by Rocko350 View Post
Go fix your fleet of 91's. I wipes my tushy with TBI.......
Quote:
Originally Posted by Needles.Kain View Post
Much like date night with BK, this isn't about what you prefer.

Last edited by sherlock9c1; 08-05-2010 at 08:19 AM.
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Old 08-15-2009, 12:18 PM
Jim Rockford Jim Rockford is offline
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Problem:Trans does not shift on its own,must manualy shift through the gears.

Cause:PCM is not telling the tranny to shift.

Fix:Buy a new or used PCM.


Problem: 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.

Cause: VSS dropoff. The rpms are too high, but the VSS is showing no movement. Did it to me after a tire burning take-off (I only have a 2800 stall). Will not store a code, and 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 -- Bryan Herter knows about it.



First and Third ranges only - No Reverse: (Originally posted by Blue Bowtie)

Reaction Sun Shell splined hu has let go (again). Throw away the POS shell that GM has refused to upgrade for 20 years and install a TCI "Beast" sun shell. Ask me how I know (four times):
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Old 08-15-2009, 12:19 PM
Jim Rockford Jim Rockford is offline
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26. 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.


Lubegard Shudder Fix will at least fix this for awhile.

http://www.midwayautosupply.com/deta...ption.asp?8791
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Old 11-08-2009, 03:37 AM
94_Mike 94_Mike is offline
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I've been having trouble with my transmission. The fuse is fine and after reading your post, I am close to sure thinking it's running in limp mode. As I have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup not being available. Yet, I don't have any trouble codes, the fuse is fine and I read that I should have trouble codes if it was to be in limp mode. I'm taking it to a shop for a diagnostics to figure what's wrong with it.

It's great to hear it doesn't do the car bad to run it for short periods of times as I do drive it at times, yet never in the freeway and never over 45mph. The thing is that I start the car and drive in manual 2nd. I should start in 2nd and then go to "OD?" I've done that before to only have the tranny slip on me.
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Old 11-08-2009, 06:16 PM
sherlock9c1 sherlock9c1 is offline
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If it isn't hot out, you can drive as long as you want with no electrical power to the transmission and it'll be fine. Highway speeds will be fine too as you get lots of airflow to cool things down and the converter slip RPM will be minimal.

Just leave it in D then. With no power to the transmission, it really doesn't matter.
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Old 11-08-2009, 07:26 PM
Midlifecrisis Midlifecrisis is offline
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my trannys in limp mode!! its blown the fuse and all.. does it as soon as i crank the car up.. the problem is, im not throwing any O2 codes.. it had a dozen codes in it at first, but i accidentily cleared them and when cranking the car back up it only throws 3 codes after it ran for 5 seconds.. one being code 83. any info on this?
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Old 11-08-2009, 08:07 PM
sherlock9c1 sherlock9c1 is offline
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Diagnose and fix all other codes FIRST before fixing transmission codes.
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Old 11-08-2009, 11:08 PM
Midlifecrisis Midlifecrisis is offline
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wellll thats the other point.. it keeps blowing that EMI fuse..
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Old 11-09-2009, 12:02 PM
sherlock9c1 sherlock9c1 is offline
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Well, disconnect everything that's on the EMI fuse and the reconnect them one at a time until the fuse blows.
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