P0700: Transmission Control System Malfunction Explained
Key Takeaway
P0700 sounds scary but it's just an informational code. Here's what it really means.
What P0700 Really Means
P0700 is an informational code only. It tells you the Transmission Control Module (TCM) has stored a fault. The actual fault is a separate, more specific code.
P0700 Is Like a Flag
| What P0700 Is | What P0700 Isn't |
|---|---|
| A flag saying "check transmission codes" | A specific diagnosis |
| Always accompanied by another code | A standalone failure |
| Read by the ECM from the TCM | A engine code |
Common Companion Codes
| Code | Meaning | Severity |
|---|---|---|
| P0715 | Input speed sensor | Medium |
| P0720 | Output speed sensor | Medium |
| P0730 | Incorrect gear ratio | High |
| P0741 | Torque converter clutch stuck | Medium |
| P0750–P0770 | Shift solenoid faults | Medium-High |
What to Do
You need a scanner that reads transmission codes (not just engine codes). The P0700 by itself tells you nothing specific.
ProHow Steer Helps
Steer reads both engine and transmission codes, showing you the specific fault behind P0700.
Fix Any Engine Issue with Steer
Get instant plain-English explanations for any engine code on your iPhone. Steer stays connected 24/7 to monitor your car's health.
