Guide To P0838 OBD Error Code Solutions

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Improper shifts and reduced fuel economy are the major setbacks for this kind of a problem. In extreme cases engine stalling and vehicle dying while slowing can be crucial on road and in extreme conditions. All these are an indication of a problematic transmission thus storing OBD code P0838 in the PCM (powertrain control module) and the check engine light getting on.

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.

When the PCM or TCM detects voltage or resistance within the 4WD switch circuit that is too low, below the normal range threshold, code P0838 will be set and the check engine light, 4WD malfunction light or both may be illuminated.

What causes this problem with the Four-Wheel Drive (4WD) Switch Circuit Low?

• 4WD sensor switch damaged
• Transfer case faulty
• Faulty wiring and connectors to the circuit
• Sensor connector corroded, damaged or loose
• Blown fuses
• PCM/TCM failure

1. Four Wheel Drive Switch - Damaged switch will not be able to make the transmission go into different drive modes. Buy new drive switch now!
2. Four Wheel Drive Actuator Cable - Inspect for actuator cable and replace if found to be damaged. Buy new 4WD actuator cable immediately.
3. Four Wheel Drive Switch Connector - Damaged or loose connector will affect the connectivity of the sensor to the switch and thus the performance. Buy new switch connector now!
4. Engine Control Module - Faulty ECM leads to engine stalling or not starting, and check engine lights being on. Replace damaged ECM now!
5. Powertrain Control Module - PCM related issues can hamper the fuel delivery system and engine performance. Find all the Powertrain related parts with us.
6. Diagnostic Tool - You will need high grade diagnostic tools for correction of the OBD error code which is detected. Visit us today to grab amazing deals.

Willing to know some common symptoms of OBD Code P0838? Your wish is our demand. Have a look at them below:

Common Symptoms

• Check Engine Light illuminated (Malfunction indicator lamp)
• Delayed shift or not shifting into gears
• Transmission slipping
• Loss of fuel economy
• Transmission stuck in a particular gear
• No change in gear

In some cases, there may be performance problems, such as dying when coming to a stop after driving on the freeway and/or misfire-like symptoms.

We have listed out some ways which would help you to correct the occurrence of OBD Code P0838. They are mentioned here as follows:

• Refill of Low transmission fluid level
• Dirty transmission fluid to be changed
• Faulty Shift Solenoids Replacement
• Replacement of TCM and PCM
• Repair or replace 4WD Switch Circuit
• Replace 4WD actuator cable
• Replacement of 4WD switch
• Repair or replace Shift Solenoids harness which is open or shorted
• Faulty Shift Solenoids circuit, electrical connection repair/replace

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 Switch, Actuator, Sensors, PCM and many more. Now all your problems would vanish within no time.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• A mechanic will first input an OBD-II code reader into the vehicle's computer in order to read and identify the trouble code.
• Feed a hydraulic pressure diagram into the proper opening in the transmission system in order to take pressure readings directly from the source.
• Test the transmission fluid with a dipstick and checked for problems. Compare any diagnostic findings with the car manufacturer's default specifications in order to pinpoint abnormalities.
• If there are other trouble codes registered on the OBD-II reader, it may offer additional guidance in finding the root problem.
• Check for scraping, rubbing, bare wires, burn spots or melted plastic in the TFPS and circuit and urns and corrosions over the connector terminal and make use of electrical contact cleaner to clean them.
• Before replacing the sensor, it is important to check for the reference voltage to the sensor and the module in on and off condition, if accordance to the appropriate range as per the car’s specification.
• Check for correct input and output voltage, and if the voltages are not in the desired range, suspect for 4WD sensor circuit and switch failure.
• Always check for PMC faults and repair, replace or reprogram as required.

Common Mistakes When Diagnosing the P0838 Code

Oftentimes the PCM sensor and circuit is blamed, and replaced, without checking the circuit as well as neglecting the damaged wiring and connectors. Because there can be several causes for this code, a complete inspection should be carried out in order to avoid repairs that may be unnecessary and more expensive.

• Transmission Control Module (TCM) failure
• 4WD actuator faulty
• 4WD sensor switch failure
• Wiring and connector issue