What Does P1738 Mean?
An electrical fault has been detected in transmission pressure control solenoid C. This solenoid regulates hydraulic pressure for specific transmission clutches or bands. Electrical problems prevent proper pressure modulation affecting shift quality.
Common Causes
35%
Failed pressure control solenoid C with internal electrical fault
30%
Corroded or damaged wiring harness or connector
20%
Low transmission fluid causing solenoid damage
10%
Transmission control module circuit failure
5%
Poor ground connection in transmission electrical system
Diagnostic Steps
1
Step 1: Verify transmission fluid level is correct and fluid is in good condition
2
Step 2: Inspect transmission electrical connectors and wiring for damage, corrosion, or moisture intrusion
3
Step 3: Measure solenoid C resistance and compare to manufacturer specifications
4
Step 4: Test power supply and ground circuits to solenoid C with voltmeter
5
Step 5: Replace pressure control solenoid C if electrical testing confirms internal fault
Estimated Repair Cost
$200 - $600
Parts + labor, varies by vehicle and location
An electrical fault has been detected in transmission pressure control solenoid C. This solenoid regulates hydraulic pressure for specific transmission clutches or bands. Electrical problems prevent proper pressure modulation affecting shift quality.
The most common cause of P1738 (Pressure Control Solenoid "C" Electrical) is: Failed pressure control solenoid C with internal electrical fault
Typical repair costs for P1738 range from $200 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause harsh or delayed shifts, slipping, or transmission entering fail-safe mode. Continued operation can lead to progressive transmission damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1738 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Manufacturer
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