What Is the P0758 Code?
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When a P0758 code appears in automatic transmission vehicles, it means that there is a disparity between the actual gear set by the transmission from the gear that the powertrain control module (PCM) expects it to be.
More about the P0758 code
Shift solenoid B allows the transmission to shift between 2nd and 3rd gear. When the powertrain control module (PCM) records code P0758, it indicates that the PCM is unable to detect the proper change in engine speed or increase in ground speed that should occur during a 2nd to 3rd gear shift. The PCM/TCM reports a solenoid problem when these sensors do not report what the PCM/TCM expects when turning the solenoid on or off.
Solenoid B is responsible for the shift between the second and third gear. If code P0758 is displayed on the scanner, then it means that the PCM cannot detect a proper speed increase after shifting from second to third gear.
A shift solenoid circuit allows the PCM to monitor changes in the transmission gear ratio. This optimizes the performance of the engine using the lowest RPM possible. Automatic transmissions depend on bands and clutches to shift gears through a series of properly timed fluid pressure changes. Transmission solenoids open or close valves that allow transmission fluid to flow to the clutches and bands during gear shifts as the vehicle accelerates.
If the PCM finds a problem within the shift solenoid circuit, then other associated codes can be displayed depending on factors such as the make and model of the vehicle, the type of transmission, and the number of gears it uses. A P0758 OBD-II error code is specifically associated with an electrical problem with the transmission shift solenoid “B” circuit.
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What Are the Symptoms of a P0758 Code?
A P0758 code may show the following symptoms: difficulty shifting from second to third gear, reduced fuel efficiency, a slipping or overheating transmission, transmission locks in gear, activated limp mode, and an illuminated check engine light.
What Are Some Causes of a P0758 Code?
A few causes behind a P0758 code include a damaged solenoid B, loose or shorted wiring or connector, a faulty valve body, or low transmission fluid.
How Serious Is the P0758 Code?
The inability to shift from second to third poses serious problems for an automatic transmission vehicle. This will compromise the vehicle’s performance and safety, so this problem should be fixed as soon as possible.
Can I Still Drive with a P0758 Code?
A P0758 code issue will be difficult to drive, so get it resolved immediately to make your vehicle drivable again.
How Easy Is It to Diagnose a P0758 Code?
An OBD-II scanner can quickly check for codes recorded by the PCM. A qualified mechanic records all the data associated with the issues behind the code. The code is cleared before taking the vehicle for a short test drive to bring out the symptoms. The vehicle is brought up to between 15 and 35 mph to see if code P0758 will reappear and validate if the problem is with the shift solenoid B.
The mechanic ensures the transmission fluid level is adequate and checks the fluid for contaminants. They visually investigate the wiring for signs of wear or fraying. The connectors are checked to see if they are attached correctly and if there are signs of corrosion or damaged pins.
Depending on the configuration, the integrity of the transmission linkage should be examined. Specific vehicle problems require advanced equipment for a more accurate analysis. A digital multimeter can be paired with specific technical references for a more detailed diagnosis.
Voltage settings will vary depending on the specific year and model, so use a troubleshooting guide made particularly for the vehicle. Continuity checks should always be done without any power along the circuit and should adequately register with 0 ohms of resistance unless specified otherwise. Resistance or noncontinuity can mean wiring that is open or shorted and must be repaired or replaced.
How Difficult Is It to Inspect a P0758 Code?
An inexperienced mechanic can easily misdiagnose an engine misfire and not properly address a P0758 code issue. It is better to consult an expert to ensure you get to the bottom of the problem.
Need Additional Help with Your P0758 Code?
Do your research using Technical Service Bulletins (TSB) specific to your vehicle. This can help point you in the right direction to avoid wasting time and money. Bring your vehicle to trusted mechanics to guarantee a quality outcome.
Use Kelley Blue Book to find a repair shop in your area. This makes fixing your car easier and more convenient, no matter what the problem may be.
If you are a DIY mechanic who wants to learn more about error codes and how to fix them, then the KBB OBD-II database provides detailed information that could help you better understand your car.
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