Common transmission problems include:
- Clutch problems
- Transmission fluid leaks
- Damaged torque converters
- Solenoid damage and
When the engine doesn't shift into gear while driving, this indicates replacement time for the clutch, while grinding and shaking show a problem of clutch or gear system damage.
Low levels of fluid or an improper thickening of transmission fluid causes shifting problems. Slipping out of the particular gear suddenly at the time of driving especially if the engine slips into neutral tells that the link which holds the gears needs repair or replacement.
When Grinding or brushing sounds occur at the time of driving it tells that there is some torque converter problem. Worn or damaged torque converter needle bearings may cause transmission damage or failure or cause the transmission to make strange noises when operating in the driving gears. The noises stop when in neutral. Without replacement the transmission failure is likely.
Gear slippage or slow shifting are symptoms of solenoid problems and may also significant about low fluid levels caused by leaks. When the leaks are absent, it indicates there is damage to the solenoid which is caused by low fluid levels or electronic problems. Leaks usually indicate that there is a problem with the transmission, gasket seals or maybe drive shaft.
Transmission fluid is responsible for the bumping noise in neutral gear. To help this, add or change the fluid. Noisy transmission in neutral could also be caused by the Worn bearings, gear teeth or the reverse idler gear.
Automatic Transmissions of the Trailblazer
- Requires correct operation of the fluid.
- Fluid may leak through worn seals in the driveshaft or the transmission. Sometimes cross contamination may happen because leaks allow radiator coolant to leak into the transmission fluid. Transmission fluid problems can cause the gears to slip and the vehicle to shift readily or slowly.
- It uses a solenoid valve which controls the flow of fluid through a system.
- Operating the vehicle when the transmission fluid is low will damage the valve. It does not work correctly when there are electrical problems. Vehicles that do not shift properly, even when fluid levels are full are usually experiencing solenoid valve problems.
- It uses a fluid clutch in the torque converter. It sometimes causes jamming and locking of the solenoid valve. The problem initially seems like a low fluid problem, but eventually there is a loss of power.
Manual Transmissions of the Trailblazer
- Grinding or shaking reports a problem with the gears. Grinding noises are more common which may or may not be because of damaged or worn gear synchronizers.
- Noises that occur after engaging the clutch and shifting gears tells that the clutch adjustment is required, or replacement is overdue
- There is a higher tendency of shaking or jerking rather than grinding and may need to be disassembled to locate the source of the problem.
- Burning smells from a vehicle indicate overheated transmission fluid.
- Transmission fluid must be cooled properly to lubricate transmission components and systems that run too hot can cause increased friction and premature wear.
- Two common causes of overheating could be Low fluid levels or using a type of transmission fluid that is unsuitable for a vehicle.
- If the problem gets severe, then a new or rebuilt transmission could be important.
The car owners must check the transmission fluid two times in a year because if the fluid gets low, it can cause the car to shift improperly, and may also damage the transmission. A leakage is possible if the car is losing a lot of fluid. It's easy to check for the leakage in the transmission because only a few places in the system are there where a leak may appear. These areas are the base of the filler tube, the drain hole under the transmission, between the engine and the transmission, and at the point where speed sensor sits.
The filter can have a clog. The filter is vital to transmission's performance, so if the filter is old, a vehicle owner should check it before going for repair. Most transmission issues are difficult to repair and need a professional assistance which repairs require skills that home mechanic does not have.
Some Important Things to be Taken Care
- Shift Solenoid: There could be a difficulty getting out of third gear which may be caused by a faulty shift solenoid.
- Jerking: Problems with shifting from first to second gear with a hard jerking is possible.
- Continuing Forward: Sometimes when the transmission is cold, the car may experience surging after the brakes are applied, diverting the driver to put the vehicle in neutral.
- Transmission Failure: The transmission is a most structurally complicated piece of machinery in cars. Because of their complexity, they can be complicated and get costly to fix. If the fluid levels are somehow failed to be maintained, the inability to change gears or a problem in starting the car may be experienced.
If the fluid is seen under the car having an unappealing burning smell indicates transmission is leaking. A fault in transmission may cause a delay in responsiveness from gears or steering abilities. This could be dangerous on the road if control over the car is lost.
Transmission solenoid fails because of electrical issues. Dirty fluids cause the shift solenoid to be stuck open or closed. Numerous problems occurring due to any changes in transmission fluid pressure are as follows:
- Erratic Shifting: On dealing with a transmission solenoid which is failed, gearbox could skip a gear up/down or shift towards back/forward in between the gears or it may get stuck in the same gear and then doesn’t shifts.
- Transmission Won’t Downshift: Whenever it happens that the transmission does not downshift then, it means one of the shift solenoids could have been experiencing stuck open or closed, restricting the fluid entry into the transmission valve body for pressurizing the right gear.
- Severe Delay in Shifting / Stuck on Neutral: In electronically controlled transmission, for gear shifting the solenoid should be good with the regulation of fluid pressure for the activation of the particular gear. When shift solenoid receives too high, or low electric current or a dirty transmission fluid makes it stuck open or closed, the gear engagement may get difficult for that time, which lets transmission experience temporarily locking in the neutral.
As solenoids are attached to the vehicle’s electric machinery system, the ECU encounters errors and triggers upon the check engine light if anything gets wrong. On such happening, the transmission may enter into the fail mode, where it engages only second or third gear to limit the speed of vehicle but without immobilizing the vehicle.
The mechanics should see the error codes. The technicians can find out the reason of solenoid’s problem using a scan tool. It could also be as clear and easy as a bad ground, and as complicated as a solenoid pack which is failed (that is a group of respective shift solenoids).
Some other resources for troubleshooting with the Trailblazer transmission issues include the Transmission Repair Cost Guide, About.com, and EricTheCarGuy.com CarsDirect and Angie's List.