P0974 OBD-II Trouble Code: Shift Solenoid A Control Circuit High

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0974 code

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.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford$20.00
Toyota$20.00
BMW$20.00
SCHEDULE P0974 DIAGNOSTIC Get a fair and transparent estimate upfront

P0974 code definition

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.

What the P0974 code means

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.

What causes the P0974 code?

Several problems may cause a P0974 code including:

  • Low transmission fluid
  • Dirty or contaminated transmission fluid
  • Damaged or defective wiring
  • Open or shorted wiring
  • Damaged or defective shift solenoid A
  • Damaged or defective ECM (rare)

What are the symptoms of the P0974 code?

Symptoms of a P0974 code may include:

  • Check engine or warning light may illuminate
  • Vehicle may not shift into one or more gears in “D” mode
  • Acceleration may be slow
  • Vehicle may shift harshly
  • Decreased fuel economy

How does a mechanic diagnose the P0974 code?

A mechanic may use several methods to diagnose a P0974 trouble code, including:

  • Utilize an OBD-II scanner to check for a stored P0974 trouble code
  • Check transmission fluid level
  • Check transmission fluid quality
  • If transmission fluid quality is degraded or burned, check transmission pan for clutch debris or other contaminants, which could signal a larger transmission-related problem
  • Visually inspect wiring for any damage, corrosion, or wear
  • Check the wiring harness for damage
  • Check that all connectors are properly connected and that there are no bent pins
  • Perform a circuit check, including checking resistance between terminals or terminal and body ground, depending on vehicle make and model
  • Check harness for continuity
  • Check the shift solenoid for damage

Common mistakes when diagnosing the P0974 code

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.

How serious is the P0974 code?

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.

What repairs can fix the P0974 code?

Several repairs can fix a P0974 trouble code and include:

  • Fill transmission fluid to manufacturer recommended levels
  • Perform a transmission fluid flush if needed
  • Repair or replace damaged or defective wiring harness
  • Repair or replace damaged or defective connectors
  • Repair or replace damaged or defective shift solenoid A
  • Repair or replace damaged or defective ECM (rare)
  • Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

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.

Need help with a P0974 code?

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 1-800-701-6230.

trouble codes
P0974
OBD-II

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0974 code.

SCHEDULE P0974 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6,144)

Rating Summary
5,685
221
51
35
152
5,685
221
51
35
152

Chris

11 years of experience
13 reviews
Chris
11 years of experience
Ford F-150 - Check Engine Light is on - North Salt Lake, Utah
We were having problems with our check engine light, and Chris was exceptionally thorough until he found the problem and could help resolve the situation. We appreciate having someone who cares enough to get the job done right, not just done. We will definitely use Chris' services in the future. Thanks Chris.

Leng

21 years of experience
2 reviews
Leng
21 years of experience
Mazda MPV - Check Engine Light is on - Seattle, Washington
Leng arrived on time and explained the issue that my van is having. I will make a follow up appointment for the fix. Friendly, easy to talk to, and professional - thank you very much!

Okela

13 years of experience
11 reviews
Okela
13 years of experience
Land Rover LR4 - Check Engine Light is on - Brooklyn, New York
Okela was incredible! He is super thorough and took time to walk us through the issues with our LR4. Couldn’t recommend more! Thank you Okela!!

Robert

37 years of experience
188 reviews
Robert
37 years of experience
Land Rover LR2 - Check Engine Light is on - Atlanta, Georgia
Robert arrived on time. Did a diagnostic check quickly. He was friendly, and gave great service. He knows how to work on a Land Rover.


More related articles

P0903 OBD-II Trouble Code: Clutch Actuator Circuit Malfunction
P0903 P0903 OBD-II Trouble Code: Clutch Actuator Circuit Malfunction Diagnostic Trouble Code (DTC): P0903 P0903 code definition P0903 is the OBD-II code for Clutch Actuator Circuit Malfunction. Other codes in the P0900 series may accompany this fault. What the P0903...
P0109 OBD-II Trouble Code: Manifold Air Pressure (MAP) Barometric Pressure Sensor Electrical Circuit Intermittent Malfunction
P0109 P0109 Trouble code definition Manifold Air Pressure (MAP) Barometric Pressure Sensor Electrical Circuit Intermittent Malfunction. What the P0109 code means P0109 is the code for a problem with the MAP circuit sensor having intermittent voltage input signals to the...
B1908 OBD-II Trouble Code: Air Bag Crash Sensor #2 Ground Circuit Short to Battery
B1908 means there is a malfunction with the #2 airbag crash sensor circuit, likely due to a bad electrical component or defective sensor.

Related questions

Car shut off while driving

Without additional information, it is hard to say what could have caused this. Your car has a variety of sensors that can cause it to shut down depending on whether or not everything is functioning correctly. I would suggest having...

p0720 code will not stay gone

Hello. If the vehicle speed sensor has been replaced then the wiring to the sensor must be tested. If there is high resistance or any breaks in the wire then this will occur. I have also seen the signal gear...

Powertrain warning lamp

In this case you will need to have the computer scanned to retrieve the codes that are stored. The codes will indicate the exact problem areas. Have the trouble codes and warning light diagnosed by a certified technician, such as...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com