Error Code P0977: What It Means & What To Do?

<<See All OBD Codes

How does P0977 error code occur in the vehicle? How to identify them? This is a general type of trouble code where the SSB control circuit refuses to shift properly. The vehicle must move efficiently down the road when several gear ratios are applied. For this purpose the hydraulic pressure which is controlled by shift solenoid is used by the TCM, so that different clutch packs can be applied in the transmission. The P0977 code is set, when the pressure control solenoid fails to perform properly.

If the shift solenoid B faces some issue, then the P0977 error code will be stored. Shift solenoid basically helps the automatic transmission for shifting the gear smoothly. They control the brakes, bands and clutch in transmission depending on each vehicle’s make and model. The shift solenoids are controlled by the TCM where the activation and deactivation of gears are done accordingly so that the vehicle shifts smoothly. If there is an abnormal voltage from the SSB, the circuit is disabled and P0977 code will be noted by the PCM.

What causes this problem with the Shift Solenoid "B" Control Circuit High?

• Shift solenoid B is faulty.
• Control circuit malfunctions.
• Electrical components like wires, fuses, connectors etc are broken.
• Fluid level in the transmission is less.
• Transmission fluid is muddy or polluted.
• At times, you will find the TCM, PCM, or ECM to be defective.

1. Engine Control Module – It is always best to replace or change the defective ECM even before it starts giving troubles.
2. Transmission Fluid – Inspect your transmission fluid if it is dirty? If you find them dirty, fill them with clean transmission fluid.
3. Transmission Control Module – One way to get rid of the P0977 error is to replace the faulty TCM.
4. Connector – P0977 error code can be easily avoided if the faulty or broken connectors are replaced.
5. Transmission Shift solenoid – Find the right replacement for this defective component from Parts Avatar at best prices online.
6. Powertrain Control Module – Quickly fixing the repaired PCM can help you to eliminate the P0977 error code.

Next important thing you need to know about are the common symptoms for this OBD error code P0977 with your fuel volume control.

Common Symptoms

• The P0977 error code will appear along with the illumination of the check engine soon warning light which is on the instrument panel. The vehicle will likely face transmission problems like severe shift or prolonged or harsh acceleration, and the incapability to contact few gears. The vehicle will also face a decrease in fuel efficiency.

Have a look at some ways with which you can correct the P0977 code:

• Replacing the shift solenoid b valve.
• Electrical components have to be fixed.
• Transmission fluid must be changed.
• Replacing the TCM, ECM or PCM.

Parts Avatar Canada is here to solve all your issues related to car parts. We have stocked a wide range of best priced ECM, transmission fluid, TCM, connector, transmission shift solenoid, PCM and a lot more to help you out in fixing your car.

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

• The mechanic will address the P0977 error code with a diagnostic scanner. He will further use this scanner to assess the codes of freeze frame data. If there are any other trouble codes, he will find and address them in the order which is displayed in the scanner. Once the code is reset, restart your vehicle and see if the code appears again. If the error does not appear, then it would have appeared mostly due to erratic error or triggered by mistake.
• If the error still appears, then the fluid in the transmission must be checked. If the level is not correct, it must be refilled and he has to check further for leakage signs. Flush the transmission fluid and replace them if it is dirty. But the fluid is contaminated, then it can cause severe damage to the transmission which needs to be replaced immediately to avoid troubles. Now carefully inspect every component and replace every damaged wire, connectors, and fuse.
• Use a DVOM, if the issue is not yet found as it can help you to find as to which circuit responds to shift solenoid B circuit error. Once the circuit has been found, carefully check every of the harness and circuits.
• Every time a repair work is done, the mechanic has to reset the code, restart the vehicle to see if the error appears again. This will eventually help the mechanic to know if the problem is solved.

Common Mistakes When Diagnosing The P0977 Code

Not following the diagnostic protocol in the correct manner gives rise to this trouble code. It is always best for the mechanic to follow this procedure in a step by step manner so that the repair work is thoroughly and properly done. Most cases, the shift solenoid is changed unnecessarily whereas the original issue may lie with muddy transmission fluid or short circuit.