What Does P0799 Mean?
Pressure control solenoid C is exhibiting intermittent electrical behavior. The TCM has detected periods of normal operation interrupted by electrical faults such as signal dropouts, resistance spikes, or erratic current draw. This intermittent nature typically points to a connection issue that is affected by temperature, vibration, or transmission fluid intrusion.
Common Causes
35%
Loose or corroded connector at pressure control solenoid C
25%
Intermittent wire break in solenoid C circuit
20%
Solenoid C with intermittent internal coil fault
12%
Transmission fluid wicking into connector causing intermittent shorts
8%
Marginal TCM connection or driver transistor degradation
Diagnostic Steps
1
Review freeze frame data to identify the conditions (temperature, gear, load) when the intermittent fault occurs.
2
Wiggle-test the solenoid C connector and transmission wiring harness while monitoring solenoid duty cycle in live data.
3
Inspect the connector for signs of fluid intrusion, corrosion, or spread terminals.
4
Measure solenoid C resistance while tapping the solenoid and flexing the connector to provoke the intermittent condition.
5
If fluid intrusion is found, replace the solenoid O-ring and clean or replace the connector.
6
Monitor the solenoid circuit with an oscilloscope during a road test to capture the intermittent dropout pattern.
Estimated Repair Cost
$150 - $850
Parts + labor, varies by vehicle and location
Pressure control solenoid C is exhibiting intermittent electrical behavior. The TCM has detected periods of normal operation interrupted by electrical faults such as signal dropouts, resistance spikes, or erratic current draw. This intermittent nature typically points to a connection issue that is a...
The most common cause of P0799 (Pressure Control Solenoid C Intermittent) is: Loose or corroded connector at pressure control solenoid C
Typical repair costs for P0799 range from $150 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent shift quality issues may occur unpredictably, including momentary harsh shifts or brief gear slippage. The vehicle is generally drivable but may behave unpredictably during the fault episodes. Schedule repair soon to prevent worsening of the electrical issue.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0799 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
