What Does P2859 Mean?
The TCM has detected that Clutch A is not releasing hydraulic pressure properly or quickly enough during disengagement. This can cause clutch drag, tie-up between gears, or harsh shifting.
Common Causes
35%
Sticking or failed pressure control solenoid valve
25%
Contaminated transmission fluid causing valve sticking
20%
Valve body wear or check ball malfunction
15%
Swollen or damaged clutch piston seals preventing release
5%
Electrical issue with solenoid control circuit
Diagnostic Steps
1
Step 1: Inspect transmission fluid for contamination, varnish, or incorrect type
2
Step 2: Monitor Clutch A release pressure and solenoid duty cycle during disengagement
3
Step 3: Test pressure control solenoid operation and check for mechanical sticking
4
Step 4: Verify proper voltage and ground signals to the solenoid during release commands
5
Step 5: Perform hydraulic pressure decay test to measure release time of Clutch A
Estimated Repair Cost
$300 - $2,200
Parts + labor, varies by vehicle and location
The TCM has detected that Clutch A is not releasing hydraulic pressure properly or quickly enough during disengagement. This can cause clutch drag, tie-up between gears, or harsh shifting.
The most common cause of P2859 (Clutch "A" Pressure Disengagement Performance) is: Sticking or failed pressure control solenoid valve
Typical repair costs for P2859 range from $300 to $2,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause binding between gears, harsh downshifts, or engine flare during shifts. Can lead to transmission overheating and premature clutch failure.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2859 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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