The P0978: Shift Solenoid ‘C’ Control Circuit Range/Performance refers to an issue where the shift solenoid ‘C’ control circuit is not operating within its expected range or performance specifications. This can cause improper transmission shifting and affect the vehicle’s performance.
P0978 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0978: Shift Solenoid ‘C’ Control Circuit Range/Performance |
| Is it serious? | Yes, range or performance issues can cause improper shifting, affecting transmission performance. |
| Possible causes | – Range or performance issues with the shift solenoid ‘C’ control circuit – Faulty shift solenoid ‘C’ – Wiring or connector issues |
| How to diagnose? | – Test the shift solenoid ‘C’ control circuit for range and performance – Inspect wiring and connectors – Replace faulty components if needed |
P0978 Meaning
The P0978: Shift Solenoid ‘C’ Control Circuit Range/Performance code indicates that the shift solenoid ‘C’ is not operating within its expected range or performance parameters. Shift solenoids control the flow of transmission fluid, and when they malfunction, it can lead to improper shifting or transmission slippage.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional fault codes that may provide more context on the performance issue. | OBD-II Scanner |
| Test for Range and Performance | Use a multimeter or diagnostic tool to test the shift solenoid ‘C’ control circuit for range and performance. Ensure it operates within manufacturer specifications. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connectors | Inspect the wiring and connectors for damage, corrosion, or loose connections that could cause performance issues. | Flashlight, Multimeter |
| Test the Solenoid | Test the shift solenoid ‘C’ for proper operation. Replace it if it is not performing within the expected range. | Diagnostic Tool, Replacement Solenoid |
| Clear the Code and Test Drive | After completing repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to ensure the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the system to ensure the P0978 code does not return after the test drive. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko