P0700
Transmission Control System Malfunction
high
i Description
The Transmission Control Module (TCM) has detected a fault and requested the ECU to illuminate the check engine light. P0700 is an informational code — it tells you there are transmission-specific codes stored in the TCM that need to be read with a transmission-capable scan tool.
? Common Causes
- This code does not indicate a specific fault — it signals other transmission codes are present
- Common underlying causes: solenoid failures, speed sensor faults, wiring issues, low fluid
! Symptoms
- Check engine light
- Transmission warning light
- Harsh or erratic shifting
- Transmission may enter limp mode (stuck in one gear)
# Diagnostic Steps
- Read transmission-specific DTCs from the TCM
- Check transmission fluid level and condition
- Address the specific transmission code found
- Inspect wiring between ECU and TCM
⚙ Typical Fix
Diagnose and repair the specific transmission fault code stored in the TCM.
Parts Needed
Varies — depends on the specific transmission code
Estimated Cost
$100-$2500
↔ Related Codes
Q Frequently Asked Questions
The transmission may be in limp mode (stuck in 2nd or 3rd gear). You can drive carefully at low speeds but get it diagnosed ASAP. Continued driving may cause further damage.
It depends entirely on the underlying transmission code. Could be a $30 solenoid or a $2000+ transmission rebuild. Get the specific codes read first.
☞ Learn More
- What is OBD-II? — Complete guide to your car's diagnostic system
- How to Read DTC Codes — Step-by-step with a Bluetooth scanner
- OBD-II Scanner Buying Guide — Find the best scanner for your car