Transmission Fluid Pressure
What does P0867 mean?
The P0867 code means the vehicle's onboard diagnostic system has detected: Transmission Fluid Pressure. This is a critical severity code.
Common Symptoms
- Check Engine Light illuminated
- Transmission slipping badly
- Delayed or no gear engagement
- Transmission overheating
Probable Causes (Ranked by Likelihood)
- Low transmission fluid from leak Very High
- Worn transmission pump High
- Clogged transmission filter Moderate
- Internal seal failure reducing line pressure Low
Step-by-Step Diagnostic Procedure
-
Check transmission fluid level and look for leaks
-
Perform a transmission line pressure test at idle and stall
-
Inspect transmission pan for metal debris indicating internal damage
-
Check transmission cooler and lines for restrictions
Frequently Asked Questions
Is P0867 a sign of serious transmission failure?
P0867 can indicate serious issues. Low fluid pressure means the transmission cannot properly engage clutches and bands, which can lead to rapid internal damage if not addressed immediately.
Should I stop driving immediately?
Yes, driving with low transmission fluid pressure causes overheating and accelerated wear. Pull over safely and have the vehicle towed.
How much fluid can a transmission lose before this code appears?
Even a loss of one quart can trigger low pressure codes in some transmissions. The exact threshold depends on the transmission design and the TCM calibration.