P099A
Shift Solenoid G Control Circuit Range/Performance
Transmission
Generic OBD-II
Medium
What it means
P099A means shift solenoid 'G' isn't performing the way the transmission control module commands — it may be sticking, slow, or affected by low or dirty fluid. The result is usually rough or delayed shifting, slipping, or a protective limp mode. Fluid condition and the solenoid itself are the most common culprits.
Medium
Can I keep driving? Usually driveable, but rough or slipping shifts mean the transmission isn't responding as commanded — repair it soon to avoid added wear.
Common symptoms
What you'll notice
- Very rough or harsh gear shifting
- Delayed engagement or slipping
- May default to limp/failsafe mode
- Check-engine light on
Common causes
Most likely first
- Failed or sticking shift solenoid 'G'Likely
- Low or contaminated transmission fluidCommon
- Valve body sticking or wornCommon
- Poor electrical connection at the solenoidLess often
How to diagnose & fix
Work through it in order
- Check transmission fluid level and condition with the dipstick; top up or service if low, burnt, or dirty.
- If the fluid is contaminated, drop the pan and inspect for debris.
- Inspect the solenoid 'G' connector and wiring for corrosion or looseness.
- Test/replace the shift solenoid, and inspect the valve body if the fault persists.
- Clear the code and road-test to confirm the repair.
FAQ
Quick answers
Is it safe to drive with P099A?+
Short trips are usually possible, but rough shifting and slipping add wear, so address it promptly.
Can I just clear P099A?+
It returns until the solenoid, fluid, or valve-body issue is corrected.
Related codes
Often seen with P099A
Read & clear P099A yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX