Slipping gears? Grinding noises? Shuddering? No reverse? Harsh shifting? No overdrive?
The transmission in your car is one of its most important components. Transmission issues can render your car motionless and you will be hunting for a ride or walking. If you take care of your car and its transmission, then it should last you a good long time. However, you do need to know which problems to look out for. With that in mind, read on below for a few of the most common transmission issues to be revealed.
Great, the dreaded check engine light started flashing in your car again. No matter how much you look at the engine, fill all the fluids, and make sure it’s working properly, you just can’t seem to make that thing turn off. Well, did you know that just because it says “Check Engine” doesn’t necessarily mean something is wrong with the engine itself? There is a long, long list of issues that can make that light go off. One of them is the transmission.
There is only one true way to know why the check engine light is on, that is to go to a repair center and have them run a diagnostic scanner. These scanners show codes and each code represent a different issue your car has. A repair tech can tell you what each code means. This is the best way to know what your issues.
If you don’t want to flat out take your car to the technician to run the scanner, there are a few signs you can look for that can let you know if your transmission is acting up. Grinding noise, this is an indication that something is off in your transmission. Either you have no fluid, or something has broken inside. You can check the fluid with the dipstick. However, if it shows full, get to a repairman ASAP. Another main transmission issue is slow or no response, when you shift gears, it should engage instantly, and lack of response can mean big transmission issues. Replacing a transmission is not only costly, but it also puts you without a vehicle for quite some time. Have it looked at before it comes to whole replacement.
Twin Transmission not only offers free transmission diagnostics, but they also have the scanner for your engine light. Stop by today to figure out the issue causing that pesky light.
What does a Diagnostic Scanner do?
There is only one true way to know why the check engine light is on, that is to go to a repair center and have them run a diagnostic scanner. These scanners show codes and each code represent a different issue your car has.
What is Grinding noise?
Grinding noise, this is an indication that something is off in your transmission. Either you have no fluid, or something has broken inside. You can check the fluid with the dipstick.
What is a 4L60E Transmission?
The 4L60-E is an automatic shift, four-speed overdrive, longitudinally positioned transmission. It has been considered to be the best rendition of the finest overdrive automatic transmission ever produced. The 4L60-E is found in nearly every GM rear-wheel-drive application, including the C/K Truck, Sonoma, Jimmy, Tahoe, Yukon, Astro, Safari, Suburban, Bravada, Firebird, Camaro and Corvette
Before the Late 4L60-E transmission, there was the Turbo 700R, which was introduced in 1982. The 4L60-E is GM’s successful continuation of the ever-improving 700R4 (aka “4L60” since 1990), introduced in 1982. The 4L60-E is the “E”lectronically shift controlled version of the 4L60. The Late 4L60-E was released in 1997 in and fully phased into wide use through GM by 1998 in both RWD car platforms (including the C6 Corvette) and trucks in both 2wd and 4wd configurations. (Most transmission models are not distinctively noted with the “E” since all GM transmissions are now also controlled electronically.)
The 4L60E Transmission has went through many changes/improvements over the years since it first came out in 1982. From bells to valve bodies, added solenoids, changes in pump and convertors. The 4L60E transmission weighs 146 pounds dry, and 162 wet. It requires 8.4 quarts (9.64″ torque converter) or 11.4 quarts (11.81″ torque converter) of transmission fluid,
Top 30 Common 4L60E Transmission Problems and Repair
Below is a list of common transmission problems with the GM 4L60E Transmission and possible solutions to repair. Although you may have some of these symptoms / problems with your 4L60E Transmission, the repair solution may differ. This list is merely a guide to the possible solutions. For a complete diagnosis on your GM 4L60E Transmission problem, contact us for a Free Diagnostic.
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 transmission may help (must remove valve body), or adding a high-viscosity 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 (Wide Open Throttle) 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). Double check 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 (Wide Open Throttle); 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.
4. 1-2 shift is delayed and harsh, may not shift into OD: TPS needs to be checked for smooth and linear electrical response over the entire range of motion. If not, this must be replaced.
5. Trans does not upshift out of first, speedometer reads zero at all times: Could be VSS failure. Rear of transmission needs to be fixed. Transmission needs to come out in order to access VSS.
6. No 3rd or 4th gear: “3-4” clutches are worn out: Needs to be removed and rebuilt. 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. Must be removed and rebuilt. 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. Transmission must be removed and rebuilt. 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. Otherwise, 2-4 band is worn out. Transmission must be removed and rebuilt.
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: transmission 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 Or a wiring problem from PCM to trans or PCM. Needs diagnostic testing.
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: A wiring problem from PCM to transmission or PCM.
13. No TCC (Torque Converter Clutch) lockup: Brake pedal switches improperly adjusted (always on), TCC solenoid failed, TCC clutch worn out (must remove transmission and replace TC).
14. TCC (Torque Converter Clutch) always locked: TCC apply solenoid circuit shorted to ground, TCC solenoid blockage, 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. Transmission must be removed and rebuilt.
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. Seal restorer may fix last problem, but probably remove and rebuild needed.
17. No forward movement in OD or D, but L2, L1 and R work: Forward sprag is broken. Transmission must be removed and rebuilt. 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. 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. Must be removed and transmission rebuilt.
20. Trans seems noisy when moving in 1st and Reverse, noise goes away instantly if you shift to N or the transmission 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. Transmission must be removed and rebuilt, sooner rather than later.
21. No movement in any gear: pump failure, or total loss of fluid. Remove transmission and rebuild, or refill pan and find the leak. If out of fluid, avoid running the engine until the transmission 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. New 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.
24. Fluid leak out of the front of trans where the converter connects; partial or full loss of movement: Front pump bushing walked out. Transmission must be removed and rebuilt. May have to replace converter also if hub is scored. Note that a leaking front seal usually means the bushing is walking out.
25. Torque converter shudder in 4th while lockup is engaged; problem goes away when the brake pedal is pressed slightly to unlock converter: Need to verify line pressure, and provided no valves in the TCC (Torque Converter Clutch) hydraulic circuit are worn, replace the torque converter.
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 (Throttle position sensor).
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: Transmission must be removed and rebuilt. 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. Transmission will eventually die a loud, catastrophic death. Cheaper to rebuild now (saves further damage to hard parts), but requires removal and rebuild. It is drivable until it breaks.
30. 1-2 or 2-3 shift is slow/soft above part throttle: Transmission is on its way out. Transmission must be removed and rebuilt.
Twin Automotive & Transmission, Charlotte’s Transmission Specialist, provides free transmission repair diagnostics (diagnostic is free with repair of the transmission). Twin Automotive offers Charlotte NC ‘s Longest Transmission Rebuild Warranty – 3 Years / Unlimited Miles.
The above top 30 common problems with the 4L60E Transmission and possible solutions for repair are merely a guide. Although you may have a similar problem as those listed above, the repair may differ based upon a visual inspection of the vehicle. Transmission problems only worsen with time. If you have any problems with your GM 4L60E Transmission, it is best to speak with a professional transmission repair expert. Still looking for answers?
Check out this INFOGRAPHIC: Five Common 4L60-E Transmission Problems
What may seem to be a transmission problem sometimes turns out to be only a torque converter problem, or both. Example: Worn needle bearings in the torque converter may produce noise when the transmission is in gear, but the noise will go away when the transmission is shifted into neutral.
If you’ve read about manual transmissions, you know that an engine is connected to a transmission by way of a clutch. Without this connection, a car would not be able to come to a complete stop without killing the engine. But cars with an automatic transmission have no clutch that disconnects the transmission from the engine. Instead, they use an amazing device called a torque converter. The transmission torque converter is an important part of your vehicle and a lot of harmful things can happen if it fails.
Signs your vehicle needs a torque converter repair or auto repair:
•Overheating is perhaps the most common Torque Converter problem, and usually occurs when there is a transmission fluid pressure drop, as might occur when the fluid is too low or the filter is clogged. Overheating can render the elastomer seals in the converter ineffective. The seals’ inability to perform their intended function of holding liquid can lead to leaks.
•Torque Converter shudder feels like driving over a heavily washboarded dirt road when accelerating. This is usually symptomatic of previously overheated or currently overheating transmission fluid.
•This is another common Torque Converter problem, and causes your car to resist acceleration while the engine continues to rev. The most common cause is low or overheated transmission fluid. Continuous high levels of slippage may overwhelm the converter’s ability to dissipate heat, resulting in damage to the elastomer seals that retain fluid inside the converter. This will cause the unit to leak and eventually stop functioning due to lack of fluid.
Debris in transmission Oil
•If your transmission fluid dipstick has flakes of black material stuck to it, either your transmission or torque converter clutches are damaged. Repair is not necessarily required, unless other symptoms manifest.
Blade deformation and fragmentation
•Due to abrupt loading or excessive heating of the converter, the pump and/or turbine blades may be deformed, separated from their hubs and/or annular rings, or may break up into fragments. At the least, such a failure will result in a significant loss of efficiency, producing symptoms similar (although less pronounced) to those accompanying stator clutch failure. In extreme cases, catastrophic destruction of the converter will occur.
•Prolonged operation under excessive loading, very abrupt application of load, or operating a torque converter at very high RPM may cause the shape of the converter’s housing to be physically distorted due to internal pressure and/or the stress imposed by centrifugal force. Under extreme conditions, ballooning will cause the converter housing to rupture, resulting in the violent dispersal of hot oil and metal fragments over a wide area.
Poor Fuel Economy
•This is generally related to converter slippage, but may also be a sign that your Torque Converter’s internal clutches are not locking up when they should be.
Benefits and Weak Points of a Torque Converter:
In addition to the very important job of allowing your car come to a complete stop without stalling the engine, the torque converter actually gives your car more torque when you accelerate out of a stop. Modern torque converters can multiply the torque of the engine by two to three times. This effect only happens when the engine is turning much faster than the transmission.
At higher speeds, the transmission catches up to the engine, eventually moving at almost the same speed. Ideally, though, the transmission would move at exactly the same speed as the engine, because this difference in speed wastes power. This is part of the reason why cars with automatic transmissions get worse gas mileage than cars with manual transmissions.
To counter this effect, some cars have a torque converter with a lockup clutch. When the two halves of the torque converter get up to speed, this clutch locks them together, eliminating the slippage and improving efficiency.
Twin Automotive, known as the Transmission King of Charlotte, can help you with any auto repair or transmission repair, including torque converter repair. If you think you have a torque converter problem, please contact us at 704-821-3460 to speak to a repair specialist for a diagnostic of your problem.
Twin Automotive serves all Charlotte NC Areas including Matthews NC, MOnroe NC, Stallings NC, Waxhaw NC, Indian Trail NC, Ballantyne NC, Pineville NC, Fort Mill SC, Concord NC, Mooresville NC and all other areas.