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

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P0974 DIAGNOSTIC 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 for $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P0974 DIAGNOSTIC Get a fair and transparent estimate upfront

diagnostic check engine light

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

Additional comments related to code P0974

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

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P0974 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,815

Rating Summary
3,485
164
43
24
99
3,485
164
43
24
99

Ira

33 years of experience
250 reviews
Ira
33 years of experience
Ira was on time, honest and complete the job timely.
2006 CHEVROLET EQUINOX - CHECK ENGINE LIGHT IS ON - GIBSONTON, FLORIDA

Dellano

15 years of experience
257 reviews
Dellano
15 years of experience
Dellano is fantastic! Dellano is a straight shooter and is upfront in helping you.
2001 LEXUS IS300 - CHECK ENGINE LIGHT IS ON - WASHINGTON, DISTRICT OF COLUMBIA

Mack

19 years of experience
92 reviews
Mack
19 years of experience
On time. Very knowledgeable. Great guy! Will not hesitate to use him again and will recommend him to everyone. Knows his stuff!
2012 MITSUBISHI LANCER - CHECK ENGINE LIGHT IS ON - MANSFIELD, TEXAS

Patrick

30 years of experience
865 reviews
Patrick
30 years of experience
Awesome job as usual. Was flexible on time and even began our appointment earlier. Gave me a thorough picture of what was wrong with my car and good advice moving forward
2002 NISSAN SENTRA - CHECK ENGINE LIGHT IS ON - AUSTIN, TEXAS

More related articles

How to Buy Fuel Treatments
Adding a fuel additive to your gas tank when you fill up is one way to clean vital engine parts of deposits, improve the performance of your engine,...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance...

Related questions

Q: Engine fault reduced power

It sounds like you could have a sticking boost pressure actuator. Unfortunately, YourMechanic does not work on your model vehicle. I suggest having the dealership take a look at it.

Q: Are Code Readers and Scan Tools Different?

There are differences and similarities between code readers and scan tools. With the advent of the vehicle on board diagnostic system (OBD) there have been many different makers of scan tools and code readers. The code readers were the first...

Q: Mercedes AMG 2001 has a P0410 code

You've changed the check valve. Unfortunately, on those things, the pumps themselves are often what go wrong. And as expensive as those things can be, you'll probably need a new pump on that thing. What you might try to...

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.

1-800-701-6230 · hi@yourmechanic.com