Error code
OBD2 P0999
OBD2P0999
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Shift Solenoid 'F' Control Circuit High.
Severity
moderateCan drive but may experience shifting issues and poor fuel economy.
Summary
P0999 indicates an issue with Shift Solenoid F in the transmission control circuit, specifically that there is excessive resistance or an open circuit.
Symptoms
- Poor acceleration
- High-revving before shifting
- Harsh shifting
- Slow engagement
Common Causes
- Rodent damage to wiring harness
- Improper repair causing misrouted or damaged wiring harness
- Burnt out shift solenoid F
Diagnosis
- Check wiring harness for damage or improper connections.
- Perform resistance checks between TCM and Shift Solenoid F.
- Test solenoid functionality if circuit checks indicate an issue.
Fixes
- Repair damaged wiring harness or replace faulty shift solenoid F
FAQ
Can I drive with P0999?
You can drive but may experience shifting issues and poor fuel economy.
What causes P0999?
Common causes include rodent damage to wiring harness, improper repair causing misrouted or damaged wiring harness, and burnt out shift solenoid F.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
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