P0756 OBD Error Code: Problem & Solutions

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Diagnostic Trouble Code P0756 implies that the vehicle’s PCM sensed an irregularity in shift solenoid B, which is located in the transmission. When the transmission solenoid is stuck off, in most cases the problem is not the electrical part of the solenoid; the problem is foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body.

Error code P0756 is technically described as Shift Solenoid 'B' Performance or Stuck Off. It indicates that PCM has detected an abnormality in shift solenoid B. This is a generic transmission diagnostic trouble code (DTC) and typically applies to OBD-II vehicles equipped with an automatic transmission. The purpose of the Shift Solenoid Circuit is for the PCM to monitor the shift solenoids to manage the movement of fluid between various hydraulic circuits and change the transmission gear ratio at the appropriate time. The P0756 OBD-II trouble code is associated with a detected performance problem or a stuck off situation in the transmission Shift Solenoid "B" Circuit.

What causes this problem with the Shift Solenoid B Performance or Stuck Off?

• Hydraulic blockages inside the internal transmission fluid passages
• Defective shift solenoid
• Contaminated transmission fluid
• Low level of transmission fluid
• Internal transmission failures
• Faulty PCM

1. Shift Solenoid - A shift solenoid is a computer controlled, electronically activated component of an automatic transmission system. There are multiple shift solenoids in a transmission. They are responsible to open/close certain valves in the transmission to regulate the flow of the transmission fluid, which causes the transmission to actually shift gears. As this code is related to shift solenoid so make sure it should work efficiently else replace it immediately.
2. Transmission Filter - As its name suggests it filters the transmission fluid and help prolong the life of your transmission by filtering out debris. Well-maintained or new filters keep contaminants out of your transmission fluid, averting premature transmission failure and ensuring a stress-free ride.
3. Transmission Valve Body - As the name suggests, automatic transmission valve body is a major component of a vehicle’s automatic transmission system. It works in a network form. The body directs pressurized transmission fluid to a network of valves that put together appropriate clutch packs for smooth gear functioning. Repair or replace the faulty one in no time.
4. Powertrain Control Module - A powertrain control module, abbreviated PCM, is an automotive component, a control unit, used on motor vehicles. It is generally a combined control unit, consisting of the engine control unit (ECU) and the transmission control unit (TCU). Though it fails rarely but if in case it happens then do the necessary replacements immediately.

Symptoms of this error code P0756 may vary from no detectable symptoms at all to a failure of the transmission to shift from (or into) any particular gear. Some common symptoms of this error code are as follows:

• Transmission Overheating
• Transmission Slippage
• Harsh Shifting
• Reduced fuel economy
• Inability to shift into gear
• Vehicle entering Limp mode.

Trouble code P0756 could easily evolve into something far worse if not treated in a timely manner. Any time your gears aren’t working correctly, the entire transmission is at risk. To fix this code following repairs may help:

• Check out the transmission fluid level, and top up if required.
• If transmission fluid is contaminated, change it immediately.
• Change the transmission fluid filter if required.
• Repair or replace a faulty shift solenoid and transmission valve body.
• Clean the blocked hydraulic blockages.
• Inspect the related wiring and connectors and replace the faulty one.
• Replace or flash the PCM.

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Here are some steps which you should follow in order to diagnose this P0756 fault code:

• Record all fault codes present, as well as all available freeze frame data. This information can be of use should an intermittent fault be diagnosed later on.
• If the application is fitted with a dipstick, check the fluid level as per the instructions in the manual, and adjust the level as required. Also check the condition of the fluid; if it is dark in color, has a burnt smell, or has a thick, tarry consistency, the fluid is degraded and it must be replaced.
• If the fluid is up to the proper mark and in good condition, locate the transmission wiring harness, and inspect it for damage or corrosion. Also perform a thorough visual inspection of all related wiring- look for damaged, burnt, shorted, disconnected, or corroded wiring. Repair or replace wiring or the connector as required.
• If the connector is in good condition, refer to the manual to determine the function and color coding of each wire in the connector. Identify the wires that relate to shift solenoid “A” in the transmission side of the connector, and perform resistance and continuity checks on these wires as per the instructions in the manual.

Common Mistakes When Diagnosing the P0756 Code

The most common mistake while diagnosing this error code is that usually people replace the shift solenoid without even inspecting that properly wherein the actual cause is something else. So, we always advise you to seek help of experienced diagnostician to do the needful.