Error code
OBD2 P0998
OBD2P0998
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Shift Solenoid 'F' Control Circuit Low.
Severity
moderateCan drive but may experience shifting issues and reduced performance.
Summary
P0998 indicates a low control circuit issue with Shift Solenoid F in the transmission's electronic control system.
Symptoms
- Poor acceleration
- High-revving before shifting
- Harsh shifting
- Slow engagement
Common Causes
- Wiring harness damage from rodent infestation or poor repair
- Faulty shift solenoid F
Diagnosis
- Check the wiring harness for damage or poor connections.
- Perform a resistance check between the TCM and shift solenoid F.
- Test the shift solenoid F directly if necessary.
Fixes
- Repair damaged wiring harness or replace faulty shift solenoid F
FAQ
What causes P0998?
Common causes include rodent damage to the wiring harness and a faulty shift solenoid F.
How do I diagnose P0998?
Use a digital multimeter (DVOM) to check resistance in the control circuit between TCM and 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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