What Does P0780 Mean?
The TCM has detected that Pressure Control Solenoid B is not performing within expected parameters during normal operation. This is a general performance code indicating the solenoid is responding but not achieving the desired pressure modulation. The solenoid may be slow to respond, not reaching full stroke, or providing inconsistent pressure regulation, resulting in shift quality issues.
Common Causes
30%
Worn or fatigued PCS B solenoid with degraded response characteristics
25%
Contaminated or degraded transmission fluid reducing solenoid precision
20%
Valve body wear causing pressure leakage past the solenoid bore
15%
Internal transmission wear affecting overall pressure regulation
10%
TCM adaptive pressure values out of range
Diagnostic Steps
1
Check transmission fluid level and condition — contaminated fluid is the primary cause of gradual solenoid performance degradation.
2
Monitor PCS B duty cycle vs actual line pressure response in live data to quantify how far off the solenoid's performance is from specification.
3
Perform a line pressure test across all gear ranges and compare to specification to determine if pressure modulation is adequate.
4
Service the transmission with fresh fluid and filter, then reset adaptive values — minor contamination issues may resolve with a fluid exchange.
5
If the issue persists after fluid service, drop the pan and inspect the valve body for worn bores, then bench-test PCS B for response accuracy.
Estimated Repair Cost
$200 - $1,400
Parts + labor, varies by vehicle and location
The TCM has detected that Pressure Control Solenoid B is not performing within expected parameters during normal operation. This is a general performance code indicating the solenoid is responding but not achieving the desired pressure modulation. The solenoid may be slow to respond, not reaching fu...
The most common cause of P0780 (Pressure Control Solenoid B Performance) is: Worn or fatigued PCS B solenoid with degraded response characteristics
Typical repair costs for P0780 range from $200 to $1,400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is drivable but may exhibit noticeably degraded shift quality — soft, mushy shifts or occasional harshness. Continued driving without repair may accelerate internal transmission wear. Schedule service within a reasonable timeframe.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0780 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
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