Chevrolet Silverado Transmission Problems & Overview

From the 1970’s to 1998, the name ‘Silverado’ was used to designate the top trim model of the Chevrolet C/K truck line. For 1999, the all new truck was called simply the Chevrolet Silverado, and the trim lines were changed to LS, LT, Silverado Z71 etc.

Building on the popularity of the first generation GMT800 Silverado, the second gen GMT900 Silverado offered improved build quality, bigger towing capacity, and more efficient engines. The latest K2XX Silverado brings the Chevy workhorse into the 21st century with a fully boxed hydroformed high-strength steel frame, available built-in Wi-Fi, and an all new 8-speed automatic transmission.

Does something seem wrong with your Silverado? Let’s look at some of the most common Chevy Silverado transmission problems, and see what you can do to get your car back on the road.

We know a good transmission shop in your area.

Chevrolet Silverado Recalls

Recall ID – NHTSA: 14V152000 – 2014 Silverado 1500

Summary

In March 2014, General Motors recalled certain 2014 model year Chevrolet Silverado Light Duty Regular Cab, Double Cab, and Crew Cab 1500 series trucks equipped with the 6-Speed Automatic Transmission (feature code MYC). The recalled trucks may have a transmission oil cooler line that is not securely seated in the fitting.

Consequence

If the line is not securely seated and transmission oil leaks from the fitting, the oil could contact a hot surface and cause a vehicle fire.

Remedy

Dealers were instructed to inspect the transmission oil cooler line connection and repair the vehicles, as needed, free of charge. Owners may contact Chevrolet at 1-866-694-6546 (refer to the Chevrolet Silverado recall 14121) or the National Highway Traffic Safety Administration at 1-888-327-4236 (refer to recall 14V152000).

Recall ID – NHTSA: 13V001000 – 2013 Chevrolet Silverado 1500 / 2013 1500 Hybrid / 2013 2500 HD / 2013 3500 HD

Summary

In 2012, GM recalled the 2013 Silverado HD, Silverado LD, Suburban, and Tahoe; manufactured between November 7, 2012, through December 18, 2012, for failing to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) No. 102, “Transmission Shift Lever Sequence, Starter Interlock, and Transmission Braking Effect”, and FMVSS No. 114, “Theft Protection and Rollaway Prevention.” These trucks may have been built with a fractured park lock cable or a malformed steering column lock actuator gear in the lock module assembly.

Consequence

As a result of this manufacturing defect, the Silverado may shift from ‘Park’ with the ignition key removed or the ignition key in the OFF position. These trucks may also shift out of Park without application of the brake pedal while the key is off. Either of these scenarios may cause the truck to roll away after the driver has exited the vehicle, resulting in a possible crash and/or injury.

Remedy

Chevy dealers were instructed to replace the steering column as necessary, free of charge. Owners can call Chevrolet at 1-800-630-2438 (refer to the Silverado recall 12331) or the National Highway Traffic Safety Administration at 1-888-327-4236 (refer to recall 13V001000).

Chevrolet Silverado Technical Service Bulletins (TSB)

2007-2008 TSB PIP4112E

Problem:

On gas-powered trucks, owners may experience a hesitation when aggressively applying the throttle after coasting with a closed throttle. Trucks equipped with the 6L80 or 6L90 transmission may experience the same hesitation after making a hard stop with a closed throttle, then aggressively applying the throttle.

Solution:

According to Chevrolet, the first condition is the result of the Torque Management software, which slowly opens the throttle for 0.7 seconds to minimize driveline lash and ‘clunking’. The second condition may occur because the 6L transmission downshifts may not be complete when the throttle is reapplied. In this case, the computer delays engine torque application for 0.5 seconds to allow the transmission to engage first gear.

2010-2013 Silverado – TSB P10488C

Problem:

Trucks equipped with the 6-speed 6L80 or 6L90 transmission may experience no forward or reverse engagement, or slipping between the gears.

Solution:

This problem could be caused by a cracked or split transmission filter. If this is the case, the fluid pump should be disassembled and inspected for possible damage. Inspect for any of the following conditions: – scored pump rotor or pump vanes – scored pump cover or pump rotor pocket – cracked pump slide.

The transmission should also be evaluated for any possible distress to the clutches. GM’s testing and analysis found that split or damaged filters may be caused by a damaged pump. This can send a high pressure fluid spike down the filter neck on a cold start, resulting in the filter body cracking or the filter seam splitting. The filter is not defective and this is not a filter quality issue. Important: Do not replace the filter without inspecting the pump. Failure to inspect the pump and clutches could lead to a repeat of this condition.

2008 Chevrolet Silverado HD – TSB 14308

Problem:

Diesel powered 2008 Silverado HD trucks equipped with the Allison 1000 6-speed automatic transmission (RPO MW7), may have a condition in which increased transmission oil cooling circuit pressure may cause transmission fluid to weep or leak. This loss of fluid occurs near the transmission cooler at the crimp joints on the metal ends of the cooler line where it joins the rubber hose. The increased oil cooling circuit pressure typically occurs while driving in extremely low temperatures.

Solution:

Inspect and replace cooler lines if necessary.

2012-2015 Chevrolet Silverado – TSB PIT5206B

Problem:

These trucks may experience unwanted grade braking when not going down a grade, reduced/low engine power with no DIC messages or DTCs (Brake Pedal Override Feature), erratic shifting or frequent up and down shifts with no DTCs. These issues may be caused by the Brake Pedal Position (BPP) sensor not being learned correctly in the ECM (Engine Control Module).

Solution:

The ECU will have to be reprogrammed.

2007-2008 Silverado – TSB 09-07-30-004J

Problem:

Trucks equipped with the 6L80 or 6L90 transmission may slip when Reverse is selected or have no/delayed reverse engagement, harsh shifts from 2-3 / 4-5 or slips while in fifth, and slipping acceleration when passing. Possible DTCs include P0776, P2715 or P2723.

Solution:

This problem may be caused by a cracked 1-2-3-4 / 3-5-R clutch housing.

2012 Silverado HD – TSB 14043

Problem:

Certain 2012 Silverado HD trucks equipped with the Allison 1000 6-speed automatic transmission (MW7), may have been built with an incorrect transmission thrust bearing. Over time, this bearing could fail, resulting in noise and poor transmission operation.

Solution:

The bearing should be replaced with GM part # 29531106

Need Your Transmission Repaired? A good repair shop can be hard to find – especially on short notice. We’ll have the Cost Guide Certified shop in your area give you a call with a free estimate.

How to Diagnose & Fix

  1. Check the OBD Codes
  2. Check the fluid level
  3. Test transmission pressure
  4. Drop the transmission pan
  5. Repair, replace or rebuild

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2 thoughts on “Chevrolet Silverado Transmission Problems & Overview

  1. 2012 Silverado truck 32000 Mel’s, had the fluid and filter changed, routine maintenance now the 1-2 shift is harsh a and when cold throws 0700 code, I can clear it and it’s fine most of the time but on occasions it will throw the code at a 1-2 shift, NO problems until the service, any thoughts, service performed at an AAMCO.

  2. 2002 Chev 2500 HD Silverado – truck was not running right check engine light came on. Diagnostic showed solenoid failure. Had both replaced, new filter and fluid, drove it out of garage and same thing loss of drive power periodically and check engine lite on. This time was told the harness between the solenoids was shorting out and needs replacing. I am to pick truck up tomorrow and wonder if I will be charged all the labor costs , fluids again or if this should have been checked out on the 1 st repair…??
    Pls advise Tks a mil.

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