P0974 Code: Shift Solenoid “A” Control Circuit High

Are you experiencing transmission-related symptoms? Check if your vehicle has any diagnostic trouble codes by using a scan tool. If a P0974 code has been triggered, read on to learn more about its definition, common causes, and common symptoms in this article.

What Does the P0974 Code Mean?

Diagnostic trouble code (DTC) P0974 stands for Shift Solenoid “A” Control Circuit High. The transmission control module (TCM) may set the code when it detects a malfunctioning shift  solenoid. The TCM uses shift solenoids to direct the flow of transmission fluid to control upshifts and downshifts. Issues with the shift solenoids can result in problematic gear shifts and other transmission-related troubles.

Note: The definition of the P0974 code can be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

What are the Common Causes of the P0974 Code

The P0974 code can be caused by several issues. Here are some of the most common:

• Low transmission fluid
• Faulty shift solenoid
• Faulty TCM
• Faulty wiring
• Valve body problems
• An internal transmission failure

What are the Common Symptoms of the P0974 Code

Your vehicle might exhibit the following symptoms if the P0974 code has been stored:

• Illuminated check engine light
• Decreased fuel efficiency
• The transmission is not shifting properly

How to Diagnose the P0974 Code

A lot of DTCs share the same symptoms and causes, which is why you still need to find the actual cause of your DTC before you conduct any repairs. Skipping a proper diagnosis can prevent you from properly fixing the issue.

The diagnostic process may require specialized tools and thorough knowledge about vehicles. It  may be best to leave the task to a professional mechanic.

If you’re interested to learn how to diagnose the problem on your own, then you should check out the video below:

How to Fix the P0974 Code

Unfortunately, there isn’t a single cure-all solution that can resolve the problems that trigger this OBD-II code for any vehicle. OBD-II code repair steps may vary from case to case because they will depend on the faulty component and the vehicle model. Once the problem has been accurately identified, then you can consult credible auto repair resources and how-to guides for possible solutions.

Chilton repair manuals are a pretty good resource, but an ALLDATA single-vehicle subscription will likely be more helpful because of its detailed factory repair information.

 If you aren’t confident about your automotive repair skills, it’s always best to consult a mechanic.