P0974 OBD Error Code: Problem & Solutions

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What causes the P0974 error code to be stored in the vehicle? Am improper shift by the transmission is referred to as shift solenoid ‘A’ control circuit high. The shift solenoids are used by the TCM so that they can apply clutch packs in the transmission. The transmission will provide different gear ratio so that when the vehicle moves down the road, the vehicle will propel correctly. In case, the pressure control solenoid fails, then the P0974 error will be set.

The automatic transmission will be able to change gears with the help of solenoid valves. They are in turn controlled by the TCM which can be separated from the ECM in very few vehicles depending on the make and model. The P0974 error code gets stored, if the NO.1 or shift solenoid ‘A’ remains ‘Off’ and this condition prevails for 0.5 seconds in the ECM terminal monitor signal of the automatic transmission which is on for one drive cycle.

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

• The level of fluid in the transmission might be low.
• The fluid in the transmission is either muddy or contaminated.
• The electrical wires are faulty.
• There is an opening or shorted wire.
• The shift solenoid ‘A’ malfunctions.
• As a very rare case, you will find the ECM to be damaged.

1. Engine Control Module - To get rid of the P0974 error code, you have to replace the faulty ECM.
2. Transmission Fluid - Visually inspect the transmission fluid for any debris. Replace them quickly even if they appear to be dirty.
3. Transmission Control Module - A faulty TCM can be changed with the right replacement part from Parts Avatar at best prices.
4. Engine wires - The corroded or damaged engine wires have to be replaced quickly to avoid further troubles in the system.

If you are facing OBD error code P0974, then there are significant common symptoms that can be felt or observed. We have worked out a list here to help you out in understanding this problem better.

Common Symptoms

• Illumination of the check engine light or the warning light.
• The vehicle might refuse to shift into one or more gears when it is in the “D” mode.
• Slow acceleration by the vehicle.
• Harsh or rough shift by the vehicle.
• Fuel economy is reduced.

After you know the symptoms of your vehicle’s problem, it becomes easy to detect it and get started with solving it. So, next on our list is a few common steps to correct this issue with your vehicle’s.

• The level of fluid in the transmission has to be filled up to the level as specified by the manufacturer.
• Flushing of the transmission fluid if it is required.
• The wiring harness which is faulty has to be replaced.
• Replacement of the connectors which is broken.
• The shift solenoid ‘A’ which is damaged needs replacement.
• As a very rare case, you will have to repair the faulty ECM.
• As a final step, every error codes have to be cleared, the vehicle has to be test-driven to see if the error codes appear again.

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If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• Initially, a scanner will be used to check the presence of P0974 error code.
• The level of transmission fluid is checked.
• Carefully inspect the quality of transmission fluid.
• You will have to check the transmission pan for any rubles or other contaminants if the quality of the transmission fluid is burnt or spoilt as it can be a big problem which is related to the transmission.
• Carefully inspect every wire if they are defective, eroded or faulty.
• Wiring harness must be checked for possible damage.
• Every connector must be correctly attached without any bent pins.
• Test the circuit and as well as check for resistance based on your vehicle make and model between the terminals or the terminal and body ground.
• The harness must be checked for continuity.
• Shift solenoid must be inspected for any damages.

Common Mistakes When Diagnosing The P0974 Code

• A transmission related fault or trouble code will mainly arise if the level of transmission fluid is less or if the fluid is dirty. So, it is always best to check the quality as well as the level of the transmission fluid. You have to flush the transmission if needed before carrying out any repairs.