The P0979: Shift Solenoid ‘C’ Control Circuit Low refers to an issue where the shift solenoid ‘C’ control circuit is experiencing lower than expected voltage. This can result in improper operation of the solenoid, leading to transmission shifting issues.
P0979 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0979: Shift Solenoid ‘C’ Control Circuit Low |
| Is it serious? | Yes, low voltage can lead to improper shifting and poor transmission performance. |
| Possible causes | – Low voltage in the shift solenoid ‘C’ control circuit – Faulty shift solenoid ‘C’ – Wiring or connector issues |
| How to diagnose? | – Check the circuit for low voltage – Inspect wiring and connectors – Replace the shift solenoid ‘C’ if necessary |
P0979 Meaning
The P0979: Shift Solenoid ‘C’ Control Circuit Low code indicates that the voltage in the shift solenoid ‘C’ control circuit is below the required level. Low voltage in this circuit can prevent the solenoid from operating correctly, resulting in poor transmission shifting, slippage, or delayed engagement.
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 further information about the low voltage issue. | OBD-II Scanner |
| Test for Low Voltage | Use a multimeter to check the voltage in the shift solenoid ‘C’ control circuit. Compare the voltage readings with manufacturer specifications to determine if they are below the expected range. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors for signs of damage, corrosion, or loose connections that could be causing low voltage in the solenoid circuit. | Flashlight, Multimeter |
| Test the Solenoid | Test the shift solenoid ‘C’ for proper functionality. Replace the solenoid if it is malfunctioning or receiving inadequate voltage. | 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 P0979 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