P255A OBD Error Code: Problem & Solutions

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The most common symptom of any problem with the PTO system is that the auxiliary component attached to the vehicle will stop operating. This can be mostly due to PTO (Power Take Off) system, sensor or circuit issues or engine and transmission issues or both. However, code P255A gets set in the system when the PCM finds a problem with the PTO speed selector sensor/switch 2 circuit/open.

Power Take-Offs (PTOs) are mechanical gearboxes that attach to apertures provided on truck transmissions and are used to transfer the power of the vehicle engine to auxiliary components, most commonly a hydraulic pump. The hydraulic flow generated by the pump is then directed to cylinders and/or hydraulic motors to perform work. In some PTO applications such as generators, air compressors, pneumatic blowers, vacuum pumps and liquid transfer pumps, the PTO provides power, in the form of a rotating shaft, directly to the driven component.

What causes this problem with PTO Speed Selector Sensor/Switch 2 Circuit/Open?

• Power take off sensor issue
• PTO sensor circuit faulty
• PTO sensor circuit wiring and connectors damaged or corroded
• Faulty hydraulic system
• Faulty transmission system
• PCM error leading to flashing of wrong code

1. Engine Control Module - There can be some engine performance issues due to faulty engine control module. If the ECM fails or has any problems it can lead to performance issues with the vehicle like misfires, hesitation, loss of power, and sometimes even decreased fuel economy.
2. Powertrain Control Module - PCM stands for powertrain control module. It is a car part, a control unit which is utilized on motor vehicles. It is generally a combined control unit, consisting of the engine control unit (ECU) and the transmission control unit (TCU).
3. Electronic Control Unit - If your automobile's check engine light remains on constantly, and never goes off, there's a good chance that your vehicle has a damaged electronic control unit. There are a lot of reasons why a car's check engine light will remain on. The most common reason is a defective ECU.
4. Diagnostic Tools - It is always advisable to use correct tools and equipment while resolving any OBD code issue as even small mistakes can lead to wrong diagnosis. Thus, always take help from a professional who has the knowledge and experience to such tools in efficient manner. Buy new quality diagnostic tools from us today!
5. Automatic Transmission Control Module - TCM can be faulty and transmit wrong voltage reading to the PCM thus causing performance issues. Buy and replace new TCM now!
6. Automatic Transmission Sensor - Sensor can also turn faulty but to mechanical failures that will affect the voltage signal being sent to the PCM/TCM. Thus, replace faulty sensor immediately.
7. PTO Speed Selector Sensor - The speed selector sensor is used to determine the speed of operation of the auxiliary component in order to invest the power from the engine properly. Thus, if its part is faulty the component might not function at all. Thus, replace it now!

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P255A code by mentioning some major symptoms below:

Common Symptoms

• Oil leakages in the hydraulic pump and the rotating shafts
• Secondary component not functioning properly
• Transmission errors
• Check engine light on

After you know the symptoms of your vehicle’s problem, it becomes easy to detect it and get started with solving it. So, next on our list is few common steps to correct this issue with your vehicle.

• PTO sensor replacement
• PTO sensor switch replacement
• Faulty circuit wiring and connector replacement
• Repair faults in the transmission system
• Refill the transmission fluids
• PCM repairs and reprogramming

However, if you face any issue then we have stocked a wide range of best priced PCM, PTO Speed Selector Sensor, PTO Speed Selector Switch, Transmission, PTO sense circuit, Engine Light, Oil Pressure Gauge and more to help you out in fixing your car.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P255A code to be stored:

• The first step is to complete a visual inspection of the wiring for the PTO sensor 2 and the circuits.
• Many times, this code can be set due to damaged wirings which are wrongly routed or damaged by road hazards.
• The next step is to measure the resistance or voltage output of the PTO sensor itself.
• If the resistance of the sensor is not as per the specifications then it is faulty and the PTO sensor is needed to be replaced.
• If the sensor checks out to be in perfect condition, then we must check the resistance of the rest of the circuit from powertrain control module to the connector of the PTO sensor.
• Check for faulty switched and blown fuses that might need replacement.
• Also check for any mechanical problems with the transmission system, hydraulic pumps and shafts.
• If the rest of the wiring is found to be good then the likely problem is with the powertrain control module itself.

Common Mistakes When Diagnosing the P255A Code

Some of the common mistakes done while changing diagnosing the OBD code P255A are:

• Not noticing the damaged or loosened wiring and circuit problems
• Signal circuit to the PTO sensor open
• Short to voltage/ground in the signal circuit to the PTO sensor
• Failed PTO Sensor mainly due to Internal mechanical transmission issue
• Faulty switch or blown fuses
• Failed PCM/TCM that might require reprogramming