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By Mighty Auto Parts
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link hidden, please login to view appeared first on link hidden, please login to view. The 2013 Ford F150 equipped with a 3.5L EcoBoost engine was running perfectly. With the exception of a drop in fuel economy, there was no indication of a problem until the Check Engine light in the dash illuminated. A system scan revealed P2098 code stored in memory, which represents Post Catalyst Fuel Trim System Too […]
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By NAPA
Is your car not shifting gears like it used to? An automatic transmission makes driving much less complicated than the manual gear (stick shift) alternative. But that convenience comes at the price of complexity. When an automatic transmission equipped car won’t shift gears, there could be several potential issues. These issues can range from a simple fix to needing a complete transmission rebuild. Below is technical expertise on “Why is my automatic car not shifting gears?”
Low Transmission Fluid link hidden, please login to view
Your automatic transmission relies on hydraulic fluid pressure to operate. The pump pulls
link hidden, please login to view from the transmission pan reservoir to actuate different components. If the transmission fluid level gets low enough, the pump will be unable to push fluid where it needs to go. Even worse, the pump will pull air into the system, which could lead to a lack of lubrication that damages parts. If you are lucky, your vehicle has a transmission fluid dipstick so you can easily check the fluid level according to the instructions in the owner’s manual. If your vehicle does not have a transmission fluid dipstick but is “
link hidden, please login to view”, that doesn’t prevent you from checking the fluid level. In most cases, the fluid can be checked via a fill plug, but the transmission has to be at a certain temperature and the vehicle must be level. This isn’t an easy task, so it might be best to have your local link hidden, please login to view do it for you. Faulty Shift Solenoid
We just mentioned how an automatic transmission relies on pressurized fluid to operate, but that fluid also needs to be routed to where it is needed. In a modern, electronically controlled automatic transmission, shift solenoids control the flow of transmission fluid. If the shift solenoid is faulty, then the fluid won’t be routed to the desired shift actuator. In older non-electronically controlled transmissions, shifting was controlled by shift valves, but the idea is the same. Shift solenoids can wear out or get stuck, leading to a no-shift condition. Fixing a faulty shift solenoid usually requires removing the transmission fluid pan to access the transmission valve body.
Low Transmission Fluid Pressure
You should be seeing a pattern of how important hydraulic fluid is to the operation of an automatic transmission. If the transmission fluid level is fine, there may still be a problem with the fluid pressure. Low fluid pressure can be caused by a worn out pump, clogged fluid passages or a clogged transmission fluid filter. A lack of shifting car gears due to low fluid pressure usually means it is time for a
link hidden, please login to view. If the problem is with the pump itself, then you are probably looking at a transmission rebuild. Bad Transmission Control Module
Most modern automatic transmissions have an electronic
link hidden, please login to view (TCM). The control module takes input from various sensors, and decides how the transmission should react. Depending on where the control module is mounted, it can lead a very hard life. Extreme temperatures, vibrations, leaking fluids and sometimes even how the circuit board is built can all lead to failures of microchips and other electronic components. If the check engine light is on while you are having shifting problems, the TCM may be the issue. Broken Shift Cable
Each time you drive, the shifter is moved at least twice, once for driving and again for park. That movement adds up over the years. While an automatic transmission doesn’t have the complicated shifting mechanism of a manual transmission, there is usually a physical connection between the shifter and the transmission. Modern
link hidden, please login to view usually have plastic components that can break down over time. There may also be bushings that get worn out. The shift cable itself is usually metal and rarely breaks, but the pieces connecting it to the transmission can possibly fail. Shift Lock Engaged
If the car is not shifting into gear from park, then the issue might be the gear shift interlock. Most modern vehicles have a lockout on the automatic gear shifter that requires the brake pedal to be pressed first. If the brake pedal isn’t pressed, the shifter won’t move. It is possible that the brake pedal sensor doesn’t read that the pedal is pressed, or a break in the shift interlock circuit interrupts the connection. The shift lock can be
link hidden, please login to view. Worn Out Bands
Just like how brake pads can wear out, so can the friction materials inside the transmission like the bands. Transmission bands hold certain components in place, while others are allowed to rotate. When this happens, the transmission won’t go into certain gears. Unfortunately worn out bands usually mean a complete transmission overhaul. Material from the worn out bands can make their way into sensitive fluid passages, clogging them or causing accelerated wear
Failed Throttle Sensor
This one may seem odd, but gauging how much throttle input the driver is giving makes a big difference in how the transmission acts. Whether the input is from a
link hidden, please login to view or a cable, if the driver pushes down the gas pedal, the transmission needs to change gears. But if that input isn’t received, the transmission has no idea what the driver wants to do. If the transmission doesn’t know the driver is hitting the gas, it might not shift into the next gear. Even worse, on some older transmissions, if the transmission isn’t linked correctly to the throttle input, severe damage can be done. If your transmission isn’t shifting like it used to, simply head to your local
link hidden, please login to view center. Our team of ASE-certified technicians have the expertise and training to diagnose your automatic transmission issues. As a bonus, your repair is covered by our free 24-Month/24,000-Mile link hidden, please login to view (parts and labor on qualifying repairs and services), which spans across the entire nationwide NAPA Network, including 17,000+ NAPA Auto Care center locations. Photos courtesy of
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By RobertScott56
If you're in need of an auto parts repair shop in Houston, there are numerous options available to you. One highly recommended establishment is Carmotive, a well-known chain with multiple locations across the city. They offer a wide range of auto parts and accessories, along with knowledgeable staff who can assist you in finding the right parts for your vehicle. Another reputable choice is O'Reilly Auto Parts, which also has several branches throughout Houston. Their stores carry a comprehensive selection of parts and tools, and their staff is known for their helpfulness and expertise. Additionally, Advance Auto Parts is another reliable option, known for its extensive inventory and convenient locations. No matter which shop you choose, be sure to call ahead to confirm availability and any specific services they offer, ensuring a smooth and efficient repair process for your vehicle.
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By Counterman
Applications are being accepted for the Federated Car Care Scholarship program.
Interested students should complete and submit their applications at
link hidden, please login to view by March 31. The Federated Car Care scholarships are funded by Fisher Auto Parts in memory of Art Fisher, founder of Federated Auto Parts and the Federated Car Care program. Qualified candidates should specify “Federated” on their application when applying online.
Administered by the University of the Aftermarket Foundation (
link hidden, please login to view), the scholarships will be awarded to employees and children of active Federated Car Care Center members attending a two- or four-year accredited college, an ASE/NATEF-certified post-secondary automotive, heavy-duty or collision technician training program or any licensed and accredited vocational school. Students graduating from high school in 2024 and heading to any of these post-secondary programs also are eligible. “It is a privilege for us to once again provide scholarship opportunities to the children and employees of Car Care members, assisting them in furthering their education,” said Bo Fisher, chairman and CEO of Fisher Auto Parts. “The University of the Aftermarket Foundation’s AutomotiveScholarships.com website streamlines the application process. We urge all interested candidates to submit their applications by March 31 and look forward to awarding Federated Car Care scholarships to another group of deserving young men and women for the 2024-25 academic year.”
Federated is one of more than 30 other organizations awarding scholarships on
link hidden, please login to view. As an added benefit for students who apply at this site, each completed application will be considered by every scholarship where the candidate meets the qualifications. The post
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By Counterman
One of the more difficult things about any technology is all the new terms you seem to get hit with, and in the automotive world, CAN bus was one of those terms. The second half, “bus,” was a term we had already used for many years, primarily as “bus bar.” A bus bar was a metal strip or bar that distributed power among multiple components.
In the automotive world, even when fiber-optic turn-signal indicators mounted on the front of a fender were as high-tech as it got, bus bars were inside many components such as fuse panels and relays, and sometimes under the hood for various engine electronics.
Then computer electronics took over. At first, we just had one electronic control unit (ECU) to deal with, and it was for the engine. Before you knew it, there was a transmission control unit, then the ABS control unit (not necessarily in that order). Wiring harnesses got bigger … and bigger and bigger.
Today, a car can have as many as 150 ECUs. In addition to the familiar engine, transmission, brake and airbag control units, doors, seats, mirrors, power steering, audio systems, cruise control, batteries and charging management systems all have their own control units. And as you can imagine, that’s just scratching the surface.
As technology was taking a ride with all these systems, engineers realized there were too many wires and too many sensors. There was no choice but to get aboard the CAN bus. CAN stands for controller area network, and a CAN bus, simply put, is a common communication line that can be used by all ECUs on the network.
The various control units on a modern vehicle need to communicate and share information over this network. Here’s an example of how and why. Years ago, when you turned on the air conditioning, a simple switch sent power to the compressor clutch. Today, the HVAC control module may need to communicate with the body control module (BCM) to notify it that A/C has been requested.
The BCM in turn sends a request to the engine control module (ECM) to “ask permission” if it can energize the A/C-compressor relay. The ECM looks at current engine operating parameters and sends a response signal to the BCM, which, in turn, sends a signal to the A/C relay.
The technological features on today’s cars are nothing short of impressive. Advanced driver-assistance systems (ADAS) include features such as adaptive cruise control, forward collision warnings, high-beam safety, lane-departure warnings, traffic-signal recognition, lane-keep assistance, automatic emergency braking and traction control.
All of the associated control units are in constant communication with each other, and since many of them must utilize information from the same sensors, through the CAN bus network this is possible. Instead of an ambient-temperature sensor for the ECM, the HVAC control unit and the instrument cluster, one sensor can share its data over the network.
Some high-end vehicles have a feature called automatic brake wiping, or brake disc wiping. This feature utilizes information from a rain sensor (also used by automatic windshield wipers) that’s sent over the CAN bus to the ABS control unit. In programmed intervals, the ABS control unit lightly applies the brakes in a manner that the driver won’t notice, to clear water and moisture away from the rotors and provide maximum braking when needed. All of this is only possible thanks to the communication available over the CAN bus.
Developing the CAN bus system was no simple feat, and it took many years to complete. The requirements for automotive CAN bus communication are standardized as part of the OBD II vehicle communication standard. There have been many changes over the years related to CAN communication, primarily affecting the speed and manner in which data is transmitted. The easiest way to think about it is to relate it to the changes over the years in USB design we’re all familiar with. It’s for the same reason. They transmit data quicker.
From a service standpoint, technicians have had to become familiar with CAN bus systems. U-codes that indicate a loss of communication between modules or on a specific bus are a tool designed to help technicians diagnose CAN bus problems.
Electrical wiring diagrams reflect the CAN bus network, and there are three different types of networks – loop, star and loop/star hybrid – referred to as CAN bus topology. Being able to recognize the type of topology can help a technician diagnose CAN bus errors quicker. In today’s world, we all have to get aboard the CAN bus.
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