Transmission Fluid Pressure Low (P0868)
The P0868 code indicates that the transmission control module (TCM) has detected low fluid pressure in the transmission hydraulic circuit. This can be caused by low transmission fluid level, a faulty transmission fluid pump, clogged filter, or internal leaks. Low pressure can lead to harsh shifting, slipping, and potential transmission damage if not addressed promptly.
01. Most Common Causes
- Low transmission fluid level
- Faulty transmission fluid pump
- Clogged transmission filter
- Internal transmission leaks
- Faulty pressure control solenoid
02. Symptoms You Will Notice
- Harsh or delayed shifting
- Transmission slipping
- Check Engine Light illuminated
- Transmission overheating
- Loss of power or acceleration
03. Step-by-Step Diagnosis
Step 1: Check transmission fluid level and condition; top off or replace if necessary.
Step 2: Scan for additional codes and inspect wiring/connectors to TCM and pressure sensors.
Step 3: Perform a transmission pressure test using a manual gauge to verify low pressure.
Step 4: Inspect transmission filter and replace if clogged; check pump operation.
Step 5: If internal leaks are suspected, perform a transmission overhaul or replacement.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with P0868 as low fluid pressure can cause severe transmission damage. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs vary widely: a simple fluid top-off may cost $50-$150, while a transmission pump replacement can be $500-$1,500. A full transmission rebuild may exceed $2,000.