Skip the auto shop - Our mechanics make house calls

P2709 OBD-II Trouble Code: Shift Solenoid F Electrical

check engine light

P2709 Trouble Code Definition

A P2709 code denotes a problem in one specific shift solenoid. Automatic transmissions are computer controlled and use shift solenoids to actuate gear changes, managing the flow and transfer of fluid between hydraulic circuits and internal passages.

What a P2709 Code Means

While the conditions that trigger a code can vary from one manufacturer, year, or model to another, almost all vehicles select gear ratios based on information from throttle position, engine load, engine speed and vehicle speed. When the desired gear ratio doesn’t agree with the gear ratio detected in real time, the code will be stored and the malfunction indicator lamp (MIL) or Check Engine Light will illuminate. Sometimes, several failure cycles may be needed for the MIL to illuminate.

Common Causes for P2709 Code

A P2709 trouble code can result from:

  • Failed shift solenoid
  • Blocked hydraulic passages inside transmission
  • Mechanical internal failures in transmission
  • Dirty or contaminated fluid
  • Failed PCM
  • Failed transmission control module

Symptoms of P2709 Code

A P2709 code can display symptoms including:

A P2709 code can also be accompanied by other solenoid-related codes.

Diagnosing the P2709 Code

  • Any transmission problem diagnosis should start with an inspection of the transmission fluid dipstick, making sure the fluid level is topped off and that fluid is in good condition. If the fluid level is low, top off with manufacturer-approved fluid and run the unit long enough to determine where the leak is coming from.

  • Dirty or burned fluid is an indication that the transmission has been poorly maintained, and may have been operated with low fluid levels.

  • In case of burned-smelling fluid, drop the transmission pan and check for clutch material and other debris in the bottom of the pan. If such debris is present, the transmission will likely need a complete rebuild of hard and soft parts, a new torque converter and a fluid flush/fill in order to work properly again.

  • If debris isn’t present in the pan, look for any burned or shorted wiring and replace connectors and circuits as needed. In most cases it will be necessary to replace the entire internal wiring harness of the transmission.

  • If the system wiring and connectors appear to be OK, connect a scanner to the diagnostic port. Record trouble codes. Clear the codes and operate the vehicle to see if the code returns. If the code doesn’t return, this could indicate an intermittent condition which may be tricky to diagnose. In some cases, the condition may have to be allowed to worsen in order to make a proper diagnosis.

  • If the transmission seems to operate normally and codes don’t register again, the problem may have been due to low fluid level/pressure. If the code returns and you notice slippage with the transmission fluid level topped off, check the pump’s pressure with a manual pressure gauge.

  • Find a hydraulic pressure diagram for the vehicle and connect the gauge to the opening at the transmission housing in order to get a pump pressure reading. Compare your readings with manufacturer’s specs and make repairs as needed.

  • Low pump pressure can be due to clogged internal passages, faulty shift solenoids, faulty electronic pressure regulator or a defective pump.

  • If the transmission seems to be operating normally but the code returns immediately, suspect the shift solenoid. Check reference voltage and ground signals using a digital volt/ohmmeter. Disconnect all other related control modules before checking circuit resistance, to avoid damage to other components.

  • Replace any circuits/connectors as needed and retest system. Use the manufacturer’s wiring diagram for the shift solenoid involved, then test the solenoid and all other related circuits for resistance and continuity. Compare readings with manufacturer’s specs. Repair/replace circuitry, connectors or components that do not fall within manufacturer’s specs.

  • Retest the system afterward. If all system circuits are within spec, connect the scanner to the vehicle’s diagnostic port and see if you can manually engage the shift solenoids in question.

  • If the solenoid still won’t activate manually, replace the solenoid or solenoid pack. If the solenoid functions properly and all circuits are OK, suspect the PCM—but keep in mind that PCMs rarely fail, and replacement of the PCM will also require reprogramming.

Need help with a P2709 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
Veteran and Military Driver Laws and Benefits in Idaho
The state of Idaho offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the...


Related questions

Q: Check Engine Light came on gave me a O2 sensor code. A week later the car broke down and won't start. It now has catalytic converter code.

It is helpful if you include the codes numbers. There are numerous O2 sensor and catalytic converter codes. There are two O2 sensors on your car. One is monitors the fuel ratio and the PCM (powertrain control module) uses it...

Q: 2054 fault code

Hello. The code you are getting is for what is known as the PremAir sensor. This is the ozone air detection sensor. They are a common failure on this vehicle. The sensor can usually be tested with a scan tool...

Q: The code read P0341, how do I know if it's the chain or the cam sensor?

There is a technical service bulletin for the Acura TSX stating that the code may be caused from the timing chain getting stretched until the tensioner cannot keep it tight any longer. This is a result of not getting oil...