The P0999: Shift Solenoid ‘F’ Control Circuit High refers to an issue where the shift solenoid ‘F’ control circuit is receiving higher than expected voltage. This can cause the solenoid to malfunction, affecting transmission fluid control and leading to improper shifting.
P0999 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0999: Shift Solenoid ‘F’ Control Circuit High |
| Is it serious? | Yes, high voltage can cause the solenoid to malfunction, leading to poor transmission performance. |
| Possible causes | – High voltage in the shift solenoid ‘F’ control circuit – Faulty shift solenoid ‘F’ – Wiring or connector issues |
| How to diagnose? | – Check the circuit for high voltage – Inspect wiring and connectors – Replace the shift solenoid ‘F’ if necessary |
P0999 Meaning
The P0999: Shift Solenoid ‘F’ Control Circuit High code indicates that the voltage in the shift solenoid ‘F’ control circuit is higher than the manufacturer’s specified range. High voltage can prevent the solenoid from properly controlling the flow of transmission fluid, leading to delayed, harsh, or erratic shifting.
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 insight into the high voltage issue. | OBD-II Scanner |
| Test for High Voltage | Use a multimeter to check the voltage in the shift solenoid ‘F’ control circuit. Compare the voltage readings to manufacturer specifications to verify if the voltage is too high. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors for damage, corrosion, or loose connections that could be causing high voltage in the solenoid circuit. | Flashlight, Multimeter |
| Test the Solenoid | Test the shift solenoid ‘F’ for proper operation. If the solenoid is malfunctioning or receiving excessive voltage, replace it. | 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 confirm that the issue is resolved. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | Re-scan the system to ensure the P0999 code does not reappear 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