[SOLVED] P0978 Code: Fixing Shift Solenoid ‘c’ Control Circuit Range/Performance Issue

Are you wondering what the automobile fault code P0978 means? Well, when this code appears, it usually indicates that there is a problem with the Shift Solenoid ‘C’. One of the common symptoms is the Engine Light being ON or the Service Engine Soon Warning Light illuminating.

The cause of this fault code could be a faulty Shift Solenoid ‘C’, an open or shorted Shift Solenoid ‘C’ harness, or a poor electrical connection in the Shift Solenoid ‘C’ circuit. To fix this issue, you should visually inspect the wiring harness and connectors, checking for any damage or corrosion.

It’s important to look for broken, bent, pushed out, or corroded connector pins. The repair time for this problem is estimated to be around 1.0.

So, if you encounter this fault code, make sure to address it promptly to avoid any further complications.

Repair Importance Level10.0 (Out of 10)
Estimated Repair TimeApproximately 1.0 hour
Repair Difficulty Level10.0 (Out of 10)

When the engine light is on or the service engine soon warning light is illuminated, it could be a sign of the p0978 fault code.

  • The symptoms of the automobile fault code P0978 include the Engine Light being ON or the Service Engine Soon Warning Light being illuminated.

The automobile fault code p0978 can be caused by a faulty Shift Solenoid ‘C’, an open or shorted Shift Solenoid ‘C’ harness, or a poor electrical connection in the Shift Solenoid ‘C’ circuit.

  • The fault code P0978 can be caused by the following: a faulty Shift Solenoid ‘C’, an open or shorted Shift Solenoid ‘C’ harness, and a poor electrical connection in the Shift Solenoid ‘C’ circuit.

To fix the automobile fault code p0978, start by visually inspecting the wiring harness, connectors, and components for any damage or corrosion.

  • To fix the automobile fault code p0978, start by checking the possible causes mentioned above.
  • Then, visually inspect the wiring harness and connectors related to the issue.
  • Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins.
  • The estimated repair time for this fix is 1.0 hour.

The factors influencing the diagnosis and fixing cost of the automobile fault code p0978 are the estimated repair time and the hourly rate charged by auto repair shops.

The estimated repair time for this fault code is 1.0 hour. Auto repair shops typically charge between $75 and $150 per hour for their services. These factors will determine the overall cost of diagnosing and fixing the p0978 fault code.

The P0978 fault code refers to a problem with the control circuit range or performance of shift solenoid ‘C’. The Engine Control Module (ECM) is responsible for commanding gear shifts by turning the shift solenoid valves on and off.

When there is an open or short circuit in the shift solenoid valve circuit, the ECM detects the issue and triggers the engine light to illuminate. Additionally, the ECM activates the fail-safe function and turns the other shift solenoid valves that are in good condition on and off. This fault code indicates a potential issue with the control circuit of shift solenoid ‘C’.

What are the possible causes of the automobile fault code P0978?

If you see the engine light or service engine soon warning light on, the fault code P0978 could be the culprit. This code is often caused by a faulty shift solenoid ‘C’, an open or shorted shift solenoid ‘C’ harness, or a poor electrical connection in the shift solenoid ‘C’ circuit. To fix this issue, start by visually inspecting the wiring harness and connectors. Look for any damaged components and check for broken, bent, pushed out, or corroded connector pins. Don’t forget to check the possible causes listed above for a more comprehensive solution.

How can I visually inspect the wiring harness and connectors to fix the issue?

To fix the issue of the Engine Light being ON or the Service Engine Soon Warning Light, start by checking the possible causes, which include a faulty Shift Solenoid ‘C’, an open or shorted Shift Solenoid ‘C’ harness, or a poor electrical connection in the Shift Solenoid ‘C’ circuit. To visually inspect the wiring harness and connectors, look for any damaged components and check for broken, bent, pushed out, or corroded pins in the connectors. This thorough inspection will help identify any issues and guide you towards the appropriate fix.

What should I look for when checking for damaged components or corroded connector pins?

When troubleshooting a Engine Light ON or Service Engine Soon Warning Light, it’s important to check for damaged components and corroded connector pins. These issues can be the cause of a faulty Shift Solenoid ‘C’, an open or shorted Shift Solenoid ‘C’ harness, or a poor electrical connection in the Shift Solenoid ‘C’ circuit. To fix the problem, visually inspect the wiring harness and connectors, paying close attention to any signs of damage. Look for broken, bent, pushed out, or corroded pins on the connectors.

p0978 error fault code explained

If you’re seeing the Engine Light ON or the Service Engine Soon Warning Light, it could be due to a faulty Shift Solenoid ‘C’, an open or shorted Shift Solenoid ‘C’ harness, or a poor electrical connection in the Shift Solenoid ‘C’ circuit. To fix this, visually inspect the wiring harness and connectors, check for damaged components, and look for any broken, bent, pushed out, or corroded connector pins.

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