P2685 - OBD Trouble Code

<<See All OBD Codes

The trouble code P2685 can be elucidated as Actuator Supply Voltage "C" Circuit Low. This code is a generic trouble code, meaning it applies to all vehicles equipped with the OBD-II system, especially those made from 1996 up to present. It’s also more common among Audi, Citroen, Chevrolet, Ford, Hyundai, Nissan, Peugeot, and Volkswagen vehicles. Specifications on the definition, troubleshooting, and repairs, of course, vary from one make and model, powertrain configuration type, to another.

Want to learn something more about the P2685 fault code? The P2685 error code would start appearing when a default in the actuator supply voltage "C" circuit would be detected by the powertrain control module. It is the PCM or one of the other supporting control modules which would detect this error code.

What causes this problem with the Actuator Supply Voltage "C" Circuit Low?

• Abraded wire causing high resistance

• Interior ECM issue causing excessive supply voltage

• Some issues related to the water intrusion

• There can be inoperative connector

• There might be short to power

• General electrical problem (e.g. charging system issue, wrong battery, etc.)

1. Engine Control Module - Most of the time it is difficult to intercept the ECM faults and thus must be checked for thoroughly. There can be a problem with the circuit or the software might have malfunctioned. Thus repair, replace or reprogram the component as per requirement.
2. Powertrain Control Module - If the PCM is faulty, it can stores wrong OBD codes and can lead to misdiagnosis. This can happen due to misinterpretation of data received from the various sensors and components which also affects the vehicle’s performance. Thus replace it immediately.
3. Fuel Injector - Faulty fuel injector, it will cause rough idles and difficulty in starting. Also, it will affect the fuel economy and engine performance. Fuel injector can also crack or break leading to leakages and should be replaced immediately.
4. Electronic Control Unit - If the ECU is at fault, it will not be able to read the boost converter temperatures correctly leading to underperformance. Thus, replace faulty ECU now!
5. Diagnostic Tool - Choose from our diagnostic tools collection that will come in handy to detect and correct the OBD error code.

You might be thinking that how would you diagnose these problems? We at Parts Avatar Canada would help you diagnose the major symptoms easily.

Common Symptoms

• The service engine soon light can start lighting up

• Below par shifting

• Shortage of torque

• Issues related to stuck in gear

• Overall bad drivability

• Finite power output

• Bad fuel mileage

• Uncommon engine revving/speeds

The repairs which you will have to do to correct this fault code are simply straightforward; you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• It is essential to restore the flawed wire which is causing high resistance

• Repair or replace the quirky electronic control unit

• Rehabilitate the defaults in the ECM

• Carefully adjust the faults in the connector

  
  

There is no need to get strained if your OBD Code is still flashing up as we are here at your service. Have a look at our superior variety of coolant control valve, engine coolant temperature sensor, position sensor, powertrain control module, engine coolant system, radiator, connectors, speed sensor, cruise control module, engine control module, ecm car, ecu car, pcm car, body control module component and many more. Now all your problems would vanish within no time.

Here are some steps which you should follow in order to diagnose this fault code:

To begin with the procedure, research the technical service bulletins (TSB's) for the specific vehicle by year, model and power plant. This aids greatly while performing the diagnosis, thereby saving time and hard earned money. The advanced steps become very vehicle specific and need the appropriate advanced equipment to perform in the right way. There would a need of a digital multimeter and the specific technical references to carry out this procedure. Voltage requirements will vary depending upon the specific year, make and model of the vehicle. The first and the foremost thing which should be done is to clear all the codes with the scanner and then the vehicle should be driven until it would become active again. Now once the right circuit/harness has been located, then it should be inspected for any defects. It could be routed under the automobile where road debris, dirt, ice, etc. can damage the circuits under there. If there is any presence of open and/or chafed wires, then they should be repaired. The connectors which are involved should also be checked. They should be disconnected to check the pins for any bent or damaged ones that could cause electrical problems. Sometimes high resistance within a circuit might cause a lot of heat. It can be so much that it can burn through the insulation!

This would be a good sign that you found your problem. The service information should be used to locate your actuator. There can be sometimes when it can be accessible externally. If this is your case, you should test the integrity of the actuator itself. The desired values involved with this test would differ significantly but make sure to have your multimeter and service manual at hand. Appropriate test pin connectors should be used to avoid any unnecessary damage to the connections. If the values recorded are outside of the desired ones, the sensor can be deemed faulty and then it should be restored with a brand new one. Carefully take a look at your ECM (engine control module) and TCM (transmission control module) for any obvious defects. Sometimes, they are situated in a location that is susceptible to water being trapped and might cause corrosion. Any green powder present should be taken as a red flag. A licensed technician should take it from here given the complexities of engine control module diagnosis.

Common Mistakes When Diagnosing The P2685 Code

• There can be some faults in the powertrain control module

• There can be inoperative transmission actuator

• Transmission control module might be flawed

• Negligence in the internal transmission

• Wiring problems