Automatic Transmission Diagnosis | Charlotte NC

Why do I need a professional Transmission Diagnosis for my Transmission problem? What does a Transmission Diagnosis involve?

For the most car drivers, the Automatic Transmission is a mystery. Put your gear selector in “D” for Drive–the vehicle goes forward. Put your gear selector in “R” for Reverse–the vehicle goes backward. Put your gear selector in “P” for Park–and the vehicle stops so you can cut the engine off. Most car drivers may know that the transmission requires fluid, but they have probably never checked the levels. So when the transmission becomes hard to shift, gears are slipping, making noises or when the gears do not work properly, most car drivers do not have a clue to what has caused this problem. This is why a Transmission Diagnosis is very important.

transmission diagnostic twin 02102011jpg resized 600An Automatic Transmission Diagnosis involves special computer system scan tools, specialized hydraulic pressure testing equipment, and advanced technician training.  Here at Twin Automotive, we use the newest and most advanced computer technology to diagnose your transmission or automotive problem. Using a device that mimmicks the look of a handheld tablet or laptop, we connect this special computer system to your vehicle. This tool will read not just the codes from any check engine light malfunction, but also reveal information that gives us an inside look at the problems with your vehicle.

Merely retrieving a code and trying a part, without an Automatic Transmission Diagnosis, will do little to repair the problem and may even damage expensive automatic transmission or emission control components.

When there is a problem with your transmission, the best thing to do is to call us immediately. Transmission problems only worsen with time. The sooner you have a transmission diagnosis performed and the problem fixed may be the difference between a minor transmission repair and a major costly transmission repair.

Automatic Transmission Problems & Diagnosis

When an automatic transmission is malfunctioning, it may exhibit one or more symptoms, such as harsh or delayed shifting, the loss of one or more gears, engine RPM “flare ups” between shifts, fluid leaks, slipping or lack of power to the drive wheels, and/or Check Engine Light or transmission overdrive illumination. When these types of symptoms occur, it is important to have an Automatic Transmission Diagnosis.

One of the most common complaints with automatics is fluid leaks. Fluid can leak out of the driveshaft seals, the input shaft seal, the transmission pan gasket, the torque converter or the ATF cooler and line connections. If the fluid level gets low, the transmission may be slow to engage when it is shifted into drive. Gear shifts may be sloppy or delayed, or the transmission may slip between shifts. If the fluid level is really low, the transmission may cause the vehicle to not go at all

If a vehicles Check Engine light is on, it means the computer has detected a fault and has set a diagnostic trouble code. There is no way to know if it is an engine code, transmission code or body code, so you will have to plug a scan tool or code reader into the diagnostic connector to extract the code.

If the transmission OD (overdrive) light is on or flashing, it means the transmission controller has diagnosed an internal transmission fault. To diagnose the problem, a scan tool that can read transmission codes must be plugged into the vehicle diagnostic connector (usually located under the dash near the steering column). The scan tool will then display the transmission code(s) that turned the warning light on. What happens next depends on the code. If the code indicates an internal performance problem, the transmission will probably need special attention to determine the problem and repair. But if the code indicates an electrical fault, it may mean a bad sensor or solenoid. When this problem is displayed, it is important to determine if there are any other underlying problems to the electrical fault. Replacing a damaged solenoid may only temporariliy fix your problem, until it breaks again, and then you have to start the process all over.

Electrical fault codes are set when the transmission controller or PCM detects an open or a short in a shift solenoid, shaft speed sensor or other device. Performance codes are set when the computer sends out a command, such as a 2-3 shift, but the transmission does not respond properly. Don’t be fooled by a faulty sensor or solenoid only replacement. Many of these problems have more underlying issues that need to be solved to prevent the same error from happening again.

Do you need a transmission diagnosis? Let Charlotte’s Transmission Specialist solve your transmission problem. Call us directly at 704-821-3460, or come by in person, to speak with one of our qualified transmission technicians. All diagnostics are FREE with repair.

Transmission Diagnosis Charlotte NC

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