P2738: Pressure Control Solenoid "F" Control Circuit Low

Definition

The OBD2 code P2738 indicates a low voltage or malfunction in the control circuit of the pressure control solenoid "F" in the transmission system

Common causes

Faulty pressure control solenoid "F"
Wiring issues (shorts, opens, or corrosion)
Poor electrical connections
Faulty transmission control module (TCM)
Low transmission fluid level
Contaminated transmission fluid
Internal transmission problems

Common misdiagnoses

Transmission fluid issues
Faulty transmission control module (TCM)
Wiring or connector problems
Faulty pressure control solenoid
Transmission valve body issues
Internal transmission failure
Incorrect transmission fluid type or level
Engine control module (ECM) issues

Troubleshooting steps

1.Check for Additional Codes
Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues affecting the transmission
2.Inspect Wiring and Connectors
3.Visually inspect the wiring and connectors associated with the Pressure Control Solenoid "F". Look for signs of damage, corrosion, or loose connections
4.Ensure that the connectors are securely attached and that there are no broken wires
5.Test the Pressure Control Solenoid "F"
6.If accessible, test the solenoid itself for proper operation. This may involve measuring resistance with a multimeter or applying voltage to see if it activates
7.Consult the vehicle’s service manual for the specific resistance values and testing procedures
8.Check the Transmission Fluid
9.Ensure that the transmission fluid is at the correct level and in good condition. Low or dirty fluid can affect solenoid operation
10.If the fluid is contaminated, consider performing a transmission fluid change
11.Inspect the Transmission Control Module (TCM)
12.Check for any issues with the TCM, as it controls the solenoids. Look for signs of damage or corrosion on the module and its connectors
13.If possible, perform a reset or reprogramming of the TCM
14.Test Voltage and Ground
15.Use a multimeter to check for proper voltage and ground at the solenoid connector. Ensure that the solenoid is receiving the correct voltage as specified in the service manual
16.If there is no voltage or ground, trace the circuit back to the TCM or fuse box to identify the issue
17.Check for Short Circuits
18.Inspect the wiring for any short circuits to ground or to other wires that could cause a low voltage condition
19.Perform a System Reset
20.After addressing any issues found, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns
21.Consult Technical Service Bulletins (TSBs)
22.Check for any TSBs related to the P2738 code for your specific vehicle make and model. Manufacturers may have known issues or specific fixes
23.Seek Professional Help
24.If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis and repair. Always refer to the vehicle's service manual for specific procedures and specifications related to your vehicle

Definition

Common causes

Common misdiagnoses

Troubleshooting steps

1.Check for Additional Codes

2.Inspect Wiring and Connectors

3.Visually inspect the wiring and connectors associated with the Pressure Control Solenoid "F". Look for signs of damage, corrosion, or loose connections

4.Ensure that the connectors are securely attached and that there are no broken wires

5.Test the Pressure Control Solenoid "F"

6.If accessible, test the solenoid itself for proper operation. This may involve measuring resistance with a multimeter or applying voltage to see if it activates

7.Consult the vehicle’s service manual for the specific resistance values and testing procedures

8.Check the Transmission Fluid

9.Ensure that the transmission fluid is at the correct level and in good condition. Low or dirty fluid can affect solenoid operation

10.If the fluid is contaminated, consider performing a transmission fluid change

11.Inspect the Transmission Control Module (TCM)

12.Check for any issues with the TCM, as it controls the solenoids. Look for signs of damage or corrosion on the module and its connectors

13.If possible, perform a reset or reprogramming of the TCM

14.Test Voltage and Ground

15.Use a multimeter to check for proper voltage and ground at the solenoid connector. Ensure that the solenoid is receiving the correct voltage as specified in the service manual

16.If there is no voltage or ground, trace the circuit back to the TCM or fuse box to identify the issue

17.Check for Short Circuits

18.Inspect the wiring for any short circuits to ground or to other wires that could cause a low voltage condition

19.Perform a System Reset

20.After addressing any issues found, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

21.Consult Technical Service Bulletins (TSBs)

22.Check for any TSBs related to the P2738 code for your specific vehicle make and model. Manufacturers may have known issues or specific fixes

23.Seek Professional Help

24.If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or transmission specialist for further diagnosis and repair. Always refer to the vehicle's service manual for specific procedures and specifications related to your vehicle