What Does P2738 Mean?
The TCM has detected abnormally low voltage or current in the Pressure Control Solenoid F control circuit. This indicates an electrical short to ground, excessive resistance, or solenoid internal failure.
Common Causes
30%
Short to ground in wiring harness between TCM and pressure control solenoid F
30%
Internal short circuit or coil failure within pressure control solenoid F
20%
Corroded or damaged connector pins at solenoid or TCM causing high resistance
15%
Failed TCM driver circuit unable to provide proper voltage to solenoid
5%
Damaged or chafed wiring at transmission case or body mounting points
Diagnostic Steps
1
Step 1: Inspect transmission wiring harness and connectors for visible damage, corrosion, or oil contamination
2
Step 2: Disconnect solenoid F connector and measure resistance of solenoid coil, compare to specifications (typically 3-30 ohms)
3
Step 3: Check for short to ground by measuring resistance between solenoid circuit and chassis ground with solenoid disconnected
4
Step 4: Backprobe TCM connector with solenoid connected and measure voltage supply during solenoid activation
5
Step 5: If wiring and solenoid test good, suspect TCM internal driver failure and test TCM grounds and power supplies
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The TCM has detected abnormally low voltage or current in the Pressure Control Solenoid F control circuit. This indicates an electrical short to ground, excessive resistance, or solenoid internal failure.
The most common cause of P2738 (Pressure Control Solenoid "F" Control Circuit Low) is: Short to ground in wiring harness between TCM and pressure control solenoid F
Typical repair costs for P2738 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Can cause transmission to operate in limp mode with limited gear availability. May result in harsh shifts or inability to shift properly, reducing vehicle control.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2738 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission Electrical Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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