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P2739 — Pressure Control Solenoid F Control Circuit High

Manufacturer-specificPowertrain (engine & transmission)

OBD-II code P2739 indicates that the transmission control module (TCM) or powertrain control module (PCM) has detected an abnormally high voltage signal in the control circuit for Pressure Control Solenoid 'F.' This solenoid regulates hydraulic pressure in the transmission to ensure smooth shifting and proper clutch operation.

Symptoms

What causes it — most likely first

1. Faulty Pressure Control Solenoid F

The solenoid itself may be internally shorted or mechanically stuck, causing a high-voltage signal in its control circuit. This is the most common cause of P2739.

2. Damaged or corroded wiring/connectors in the solenoid circuit

Chafed, broken, or corroded wires or connectors between the solenoid and the TCM/PCM can create an open or high-resistance circuit, leading to elevated voltage readings.

3. Poor electrical ground or power supply to the solenoid

A weak or intermittent ground connection, or issues with the power supply (e.g., blown fuse, faulty relay), can cause erratic voltage signals in the solenoid circuit.

4. Contaminated or degraded transmission fluid

Old or contaminated fluid can cause the solenoid to malfunction by increasing resistance or preventing proper movement of internal components.

5. Internal transmission mechanical failure

Rarely, issues such as a blocked hydraulic passage or damaged valve body can indirectly affect solenoid operation, though this is less likely to trigger P2739 specifically.

6. Faulty TCM or PCM (rare)

While uncommon, a malfunctioning transmission or powertrain control module could misinterpret signals or send incorrect commands, leading to a false P2739 code. This should only be considered after all other causes are ruled out.

How it's diagnosed

  1. Retrieve and document all stored trouble codes, including pending codes, using an OBD-II scanner. Check for related transmission or solenoid codes.
  2. Inspect the wiring harness and connectors for the Pressure Control Solenoid F circuit. Look for signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Measure the resistance of the Pressure Control Solenoid F using a multimeter. Compare the reading to the manufacturer’s specifications. Replace the solenoid if it is out of range.
  4. Test the voltage supply and ground circuits to the solenoid. Ensure proper voltage is present when the solenoid is commanded on. Verify ground integrity.
  5. Check the condition and level of the transmission fluid. If contaminated or degraded, perform a fluid and filter change. Use only the manufacturer-recommended fluid type.
  6. If all electrical and mechanical checks pass, use a scan tool to monitor solenoid command signals and live data. Compare actual vs. expected solenoid behavior during test drives or bench testing.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesP2730 — Pressure Control Solenoid E Control CiP2731 — Pressure Control Solenoid FP2732 — Pressure Control Solenoid F PerformancP2733 — Pressure Control Solenoid F StuckP2734 — Pressure Control Solenoid F ElectricalP2735 — Pressure Control Solenoid F Intermitte

Frequently asked

Is the PCM/TCM usually the cause of P2739?

No. While a faulty control module *can* cause P2739, it is extremely rare. The solenoid itself, wiring, or fluid issues are far more likely causes. Replacing the PCM/TCM should only be considered after all other possibilities are exhausted.

Can I drive with a P2739 code?

Driving with P2739 may lead to further transmission damage, especially if the vehicle is experiencing harsh shifts or slipping. It is recommended to diagnose and repair the issue as soon as possible to avoid costly repairs.

Will changing the transmission fluid fix P2739?

Changing the fluid *might* help if the issue is caused by contaminated or degraded fluid, but it is not a guaranteed fix. Always diagnose the root cause (e.g., solenoid, wiring) before assuming fluid is the solution.

Why does my scan tool show P2739 but no symptoms?

Intermittent electrical issues (e.g., loose wiring, marginal solenoid) can trigger P2739 without noticeable symptoms. However, the problem may worsen over time, so it’s best to address it early.