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P0974 is a diagnostic trouble code (DTC) for "Shift Solenoid A 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. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0974 code is generic powertrain code related to the transmission, including pressure faults and sensor failures. In this case, the engine control module (ECM) has detected a fault with a high voltage reading from the shift solenoid A control circuit.
Solenoid valves helps the automatic transmission change gears and are controlled by the transmission control module, which could be separate from the ECM in some vehicle makes and models.
A code P0974 will be stored when the shift solenoid A, or No. 1, is “OFF” and a status continues for 0.5 seconds with the automatic transmission ECM terminal monitor signal is on for one drive cycle.
Several problems may cause a P0974 code including:
Symptoms of a P0974 code may include:
A mechanic may use several methods to diagnose a P0974 trouble code, including:
As with any transmission-related fault or trouble code, it is possible that the cause is low or dirty transmission fluid. It is recommended to check transmission fluid levels and quality, filling or flushing as needed, before performing any additional repairs.
Because a vehicle’s safe driving operation most likely will be impacted due to faults that store a P0974 code, this code is considered a potentially serious code. When this code appears, it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.
Several repairs can fix a P0974 trouble code and include:
Incorrect repairs on the radiator or cylinder head can cause a P0974 trouble code due to misrouted harnesses or other errors.
In addition, this code is common on vehicles that have been stored for periods of time and have animals taking residence in the vehicle’s engine compartment and gnawing on wires.
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.