The 8-speed automatic in your 2020 Sorento should shift smoothly and imperceptibly. Hard, jarring shifts accompanied by a P0700 code indicate the transmission control system has detected a problem. Let's understand what's happening inside.
What P0700 Means
The P0700 code is a generic transmission fault indicator—it tells you the Transmission Control Module (TCM) has logged a problem but doesn't specify what. Think of P0700 as a signpost pointing you to dig deeper into transmission-specific codes.
Hard Shifting Explained
Normal shifts happen seamlessly as clutch packs release and engage in precise sequence. Hard shifts occur when:
- Clutch engagement happens too quickly
- Hydraulic pressure is incorrect
- Software commands shifts too aggressively
- Internal components are wearing
Common Causes
- Low transmission fluid - Inadequate fluid for smooth clutch engagement
- Degraded fluid - Lost friction modifier properties
- Solenoid failure - Can't regulate pressure properly
- Valve body issues - Hydraulic control problems
- TCM software - May need updating
- Worn clutch packs - Can't engage smoothly
Diagnostic Steps
- Pull all transmission codes with capable scanner
- Check fluid level and condition
- Verify software is current version
- Monitor shift pressure and timing data
- Check for Technical Service Bulletins
The 8-Speed Automatic
The 2020 Sorento uses a conventional 8-speed automatic (not a DCT or CVT). This transmission is generally reliable but complex. Software calibration significantly affects shift quality.
Repair Costs
- Fluid service: $200-$400
- TCM software update: $100-$200
- Solenoid replacement: $400-$800
- Valve body service: $800-$1,500
- Transmission rebuild: $3,000-$5,500
Kia covers the transmission under the 10-year/100,000-mile powertrain warranty.