What causes a shift solenoid code of p0977?
A few factors can cause the P0977 code to be detected: 1 Faulty shift solenoid valve B 2 Malfunctioning control circuit 3 Damaged or defective electrical components, such as wires, connectors, and fuses 4 Low transmission fluid levels 5 Dirty or contaminated transmission fluid 6 In rare cases, a faulty PCM, TCM, or engine control module (ECM)
How does the TCM check the Shift Solenoid?
During operation, the TCM checks the operation of the solenoid valves, consisting of a resistance check and speed sensor verification. If one of these checks fails, such as encountering a short circuit on Shift Solenoid B (SSB), the TCM disables that control circuit and sets DTC P0976 – Shift Solenoid B Control Circuit Low in ECM memory.
Why is my transmission solenoid not working properly?
If the transmission control unit is not able to open, the shift solenoid with help the power or ground, and it will store a trouble code in the transmission control unit on the affected shift solenoid. It’s also possible that the shift solenoid has an internal problem or is stuck so the transmission control unit can’t open it properly.
Why is DTC p0976 low in ECM memory?
If one of these checks fails, such as encountering a short circuit on Shift Solenoid B (SSB), the TCM disables that control circuit and sets DTC P0976 – Shift Solenoid B Control Circuit Low in ECM memory. What are the common causes of code P0976 ? Depending on year, make, and model, DTC P0976 may have a couple of causes.
A few factors can cause the P0977 code to be detected: 1 Faulty shift solenoid valve B 2 Malfunctioning control circuit 3 Damaged or defective electrical components, such as wires, connectors, and fuses 4 Low transmission fluid levels 5 Dirty or contaminated transmission fluid 6 In rare cases, a faulty PCM, TCM, or engine control module (ECM)
What is the DTC for Shift Solenoid B?
P0977 is a diagnostic trouble code (DTC) for “Shift Solenoid B Control Circuit High”. This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $0.0.
What is the OBD code for Shift Solenoid?
The P0977 code is a standard OBD trouble code that detects an issue with the shift solenoid valve B control circuit. Shift solenoids are used to help create smooth gear shifts in the automatic transmission.
What do the shift solenoids do in a car?
The various shift solenoids control the brakes, bands, and clutches in the transmission, with the B solenoid varying depending on the make and model of the vehicle. The transmission control module (TCM) controls the shift solenoids, and activates and deactivates them as necessary to adjust the gear ratios and facilitate smooth shifting.
What does the valve B shift solenoid code mean?
The valve B shift solenoid is responsible for different parts of the transmission, depending on the make and model of the vehicle, so the gears that are inaccessible when the P0977 code is detected will differ from car to car. This code is only applicable for vehicles with automatic transmissions.
Why does my car not shift into third gear?
Such a problem is automatic transmission won’t shift into 3rd gear. The transmission shifts into the first and then to second gear but does not move into the third gear. It seems that the gear slips into neutral when you push it to the third. Another instance could be the automatic transmission won’t shift into 3rd gear at all.
What causes automatic transmission to not shift properly?
A faulty PCM (powertrain control module) will affect the transmission performance because it controls the gearbox mechanism in most car models. The PCM will have no input if the speed sensor fails. In that case, the transmission will not shift properly. To solve this problem, you have to check the speedometer to see…
Why is my transmission not shifting to third gear?
If you ignore the signs for too long, it could lead to a possible failure of the transmission. Let’s see what could be the reasons for the auto gearbox not to shift from second gear to the third. Overheating could be a reason for the gear to stick and the low fluid level is the culprit for making the transmission overheated.
How does a solenoid get power to shift gears?
The transmission control module (TCM) — the brains of the transmission — will send power to one of the shift solenoids in order to shift gears. Inside the solenoid, there’s a plunger surrounded by a magnetic coil.
What are the diagnostic codes for Shift Solenoid?
The most common one is the check engine light will be on with one of the following diagnostic trouble codes: P0751 1-2 Shift Solenoid Valve Performance (Shift Solenoid A Performance) P0753 1-2 Shift Solenoid Valve Electrical (Shift Solenoid A Electrical) P0756 2-3 Shift Solenoid Valve Performance (Shift Solenoid B Performance)
How to test shift solenoids on GM 4.3L?
In this article, I’ll show you how to test the transmission shift solenoids (specifically 1-2 solenoid and 2-3 solenoid) on your GM 4.3L, 5.0L, 5.7L pick up, van, SUV. You’ll be surprised just how easy it is to diagnose these shift solenoids when they have failed.