P0700
PowertrainTransmission Control System Malfunction
The transmission control module has detected a fault and stored a code, but P0700 itself doesn't tell you what's wrong. It's a 'check the transmission' alert.
ⓘ Information only. This page provides general educational information about fault code P0700. We do not assess the urgency or safety implications of any specific fault. That requires in-person diagnosis by a qualified mechanic. Full terms.
Recommended next steps
Whether a fault is urgent, drivable, or routine depends entirely on the cause on a specific vehicle, and that can only be determined by a qualified mechanic with diagnostic equipment. If a warning light is illuminated, the most reliable next step is professional diagnosis.
What does P0700 mean?
P0700 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Transmission Control System Malfunction.
This is a standardised OBD-II code. The technical definition is the same regardless of the make or model of vehicle, although specific causes and symptoms can vary between vehicles.
Symptoms commonly associated with this code
Symptoms that drivers often report alongside this code. Not all may apply to every case:
- • Engine warning light, sometimes alongside a separate transmission warning
- • Transmission may shift harshly or hold gears unexpectedly
- • Possible 'limp mode', restricted to a single forward gear
- • Slipping between gears
- • Sometimes no obvious symptom at all
Possible causes
Causes commonly associated with P0700, listed in approximate order of typical investigation. The actual cause on a specific vehicle can only be confirmed by professional diagnosis.
- 1. Almost any transmission fault, P0700 is a generic 'transmission has a problem' indicator
- 2. The actual cause is identified by the more specific code stored alongside it (typically P07xx, P08xx, or P09xx)
- 3. Low or contaminated transmission fluid
- 4. Failing transmission solenoid or sensor
- 5. Internal transmission wear
- 6. Wiring or electrical fault in the transmission control circuit
How mechanics typically diagnose
A typical diagnostic sequence used by mechanics, provided here for educational reference only. Diagnostic work should be performed by a qualified mechanic with the appropriate tools and training.
- 1. Always read the transmission control module (TCM) codes, not just the engine codes. Many basic readers only read engine codes and miss the underlying fault
- 2. Look for codes in the P07xx–P09xx range stored alongside P0700
- 3. Check transmission fluid level and condition (where the transmission has a dipstick)
- 4. Once the specific code is known, diagnosis follows that code's logic
Common questions about P0700
Is P0700 serious? +
It depends entirely on the underlying code. Some companion codes indicate minor sensor faults; others point to internal damage that requires major work. The specific code stored alongside P0700 is what matters.
Can I drive with P0700? +
If the transmission is in limp mode or shifting harshly, drive only as far as needed to reach a garage. If there are no drivability symptoms and no specific transmission code, short journeys are usually fine, but get it diagnosed promptly.
Information only, not professional advice
The information on this page is provided for general guidance and educational purposes only. It is not a substitute for diagnosis or repair advice from a qualified mechanic. Always verify any fault before paying for repairs. carfaultcodes.co.uk accepts no liability for decisions made based on this information. Full terms →