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4l60e Problems and Solutions

Discussion in 'General' started by White Tiger, Oct 25, 2009.

  1. White Tiger

    White Tiger Semper Fidelis

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    I found this on another forum, thought it might helpful seeing as so may of us have trans
    problems i'm no trans prerson so i'm sorry for any inaccuracies.
    hope it helps at least one person out if not ohwell



    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, 3rd gear starts, manual 2nd available but no 1st,
    no 4th, and no TCC lockup: No power to transmission, or trans is in limp-home mode.
    Check trans fuse underhood, and make sure transmission electrical connector is plugged
    in. Easy fix.

    11. No 1st or 4th available; trans shifts 2nd to 3rd by itself in D or OD : ShiftA
    solenoid failed. Easy fix in the pan. Or a wiring problem from PCM to trans.. or PCM.

    12.
    No 2nd or 3rd available: 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. 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.

    25. 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.).

    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. Also, Lubegard Shudder Fix will at least fix this for awhile. Or try a
    transmission flush by a shop that uses BG brand products.

    27.
    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.

    28. All fluid pumped out through the vent tube: Plugged cooler line. Flush the
    transmission cooler and cooler lines. Also could be overfiled transmission.

    29. 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:Internal crossleak feeding the forward
    clutches all the time. Most likely a cracked input housing. R&R required. Car can safely be
    driven gently in forward gears until the repair.

    30. 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.

    31. 1-2 or 2-3 shift is slow/soft above part throttle: Trans is on its way out. R&R.
     
  2. CalaisJohn

    CalaisJohn New Member

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    good stuff should come in very handy, thanks mate :clap:
     
  3. DannyboyDS

    DannyboyDS Just hand me the pliers.

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    good info, thanks for that.
     

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