P0867
PowertrainTransmission Fluid Pressure (TFP)
The transmission control module reads a fluid pressure sensor inside the gearbox, then compares that figure against what the pressure should be for the gear and load you're in. When the real number drifts too far from the expected one, it logs P0867. For you that means the box can't reliably build or hold the hydraulic pressure it needs to shift cleanly, and the cause runs anywhere from a quart low on fluid to a worn pump or a dying sensor.
ⓘ Information only. This page provides general educational information about fault code P0867. 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 P0867 mean?
P0867 is a Powertrain (engine, transmission, fuel system) fault code. It indicates: Transmission Fluid Pressure (TFP).
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:
- • Gearbox warning light or engine management light on the dash
- • Slipping between gears, or harsh thumps as it changes
- • Long pause after you select D or R before anything happens
- • Car drops into limp mode and holds one gear, often third
- • Transmission running hotter than usual on a longer run
- • Whining or churning noise from under the car as fluid pressure drops
Possible causes
Causes commonly associated with P0867, listed in approximate order of typical investigation. The actual cause on a specific vehicle can only be confirmed by professional diagnosis.
- 1. Low or burnt fluid, the first thing to rule out. If it's down or smells scorched the pump can't make pressure no matter how healthy everything else is
- 2. Faulty pressure sensor or a broken sensor circuit feeding the TCM a false reading. The box itself may be fine here
- 3. Damaged wiring or corroded connectors at the sensor, common on cars that have sat in salty winter conditions
- 4. Clogged transmission filter starving the pump of clean fluid, more likely on a box that's never had a service
- 5. Worn pump that can no longer hold target pressure, usually higher-mileage territory
- 6. Internal wear inside the gearbox itself, leaking clutch packs or valve body, the expensive end of the list
- 7. Faulty TCM or PCM, rare but it does happen
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. Read all stored codes and the freeze frame data so you know what gear, temperature and load the fault logged in. That context narrows it down fast
- 2. Check fluid level and condition on a level surface at the right temperature. Low, brown or burnt fluid points you straight at the answer and you fix that before anything else
- 3. Inspect the pressure sensor wiring and plug for corrosion, chafing or a loose pin. Wiggle-test it while watching live data
- 4. Back-probe the sensor and check its voltage and resistance against the manufacturer figures. A sensor reading flat or stuck is your culprit
- 5. Drop the pan or check the filter for debris and metal. Glitter in the pan means internal wear and changes the whole conversation
- 6. If fluid, sensor and wiring all check out, hook up a mechanical pressure gauge to compare actual line pressure against the sensor. That tells you whether the pump or the sensor is lying
Common questions about P0867
How long is my car going to be in the garage for this? +
Depends entirely on what they find. A fluid and filter service or a sensor swap is usually a half day, in and out the same afternoon. If the pressure test points at the pump or the valve body, you're looking at the box coming out, which is a day or two of labour. Full gearbox rebuild or replacement can be most of a week once parts arrive. Ask for the diagnosis first and a firm quote before they touch the internals.
Should I save money with an aftermarket sensor or stick with the genuine part? +
For the pressure sensor itself a decent quality aftermarket unit from a known brand is fine and a fraction of the dealer price. Avoid the cheapest unbranded ones off auction sites because a sensor that reads slightly off will just relog the code and waste your fluid. If the fault turns out to be the pump or anything internal, fit OEM or a proper reman unit. A cheap pump in a transmission is a false economy that you'll be paying for again within a year.
Can I keep driving it for now? +
If it's slipping, banging into gear, overheating or sitting in limp mode, stop and get it recovered. Driving a transmission that can't hold pressure cooks the clutch packs and turns a sensor job into a rebuild. If the only symptom is the warning light and it still shifts normally, you can drive gently to a garage, but don't put it off and don't tow or load it up.
Is this going to be an MOT problem? +
There's no specific transmission pressure check on the MOT, so P0867 on its own won't fail you. The catch is the warning light. If the MIL is lit when the tester looks at the dash, that can be marked as a fail, so clear the fault and the light before booking the test. If the car drops into limp mode during the drive to the test centre that's a separate headache you'll want sorted first.
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 →