P0700: Transmission Control System Malfunction
P0700 is triggered by the transmission control module when it detects a fault. Pull the companion P07xx code for specifics.
Severity: serious · System: Powertrain · Safe to drive: no — get it checked. Serious. Reduce driving until diagnosed to avoid transmission damage.
Symptoms
- Harsh shifts
- Slipping between gears
- Limp mode
- Transmission warning
Common causes
- Sensor failure
- Low ATF
- Solenoid failure
- TCM fault
Fair repair prices
| ATF service | $150–$350 |
|---|---|
| Solenoid replacement | $300–$900 |
| TCM repair | $400–$1,200 |
Ranges are US market averages (parts and labor). If your shop's quote is above the high end, ask for a line-item breakdown or run it through the invoice checker.
Other codes
- P0300 — Random / Multiple Cylinder Misfire Detected
- P0301 — Cylinder 1 Misfire Detected
- P0420 — Catalyst System Efficiency Below Threshold (Bank 1)
- P0430 — Catalyst System Efficiency Below Threshold (Bank 2)
- P0171 — System Too Lean (Bank 1)
- P0174 — System Too Lean (Bank 2)
- P0442 — Evaporative Emission Control System Leak (Small)
- P0455 — Evaporative Emission Control System Leak (Large)