Transmission Fluid Pressure Too Low
The P2807 code means the vehicle's onboard diagnostic system has detected: Transmission Fluid Pressure Too Low. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- hard
- Estimated cost
- $200 - $3000 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
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Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- All shifts slipping
- Delayed engagement in all gears
- Transmission making whining noise
- No movement when gear is selected
Probable Causes (Ranked by Likelihood)
- Low transmission fluid level Very High
- Transmission fluid pump failure High
- Major internal hydraulic leak Moderate
- Pressure regulator stuck open Low
Step-by-Step Diagnostic Procedure
-
Check transmission fluid level immediately
-
Perform line pressure test in all ranges
-
Listen for pump whining indicating cavitation
-
Check for external fluid leaks
Frequently Asked Questions
Can low fluid cause total loss of movement?
Yes. The transmission pump needs fluid to create hydraulic pressure. Without adequate fluid, no clutches can engage and the vehicle will not move.
What causes a whining noise with low pressure?
The transmission pump is cavitating, meaning it is trying to pump air instead of fluid. This creates a high-pitched whining noise.
How much fluid does a typical transmission hold?
Most automatic transmissions hold 8 to 16 quarts depending on the design. Even being one or two quarts low can cause significant issues.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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