P085D - OBD Trouble Code

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Are you experiencing hard gear shifts and gear slipping? Is there a lack of engine power and hesitation during acceleration? Is the Check Engine Light illuminating on dashboard? All these may be due to faulty gear shift control module flashing and storing OBD code P085D in the Powertrain Control Module (PCM).

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.

It is important to understand that the PCM and TCM relies on the various sensors to decide the engine speed and torque to decide as to which gear to shift into and thus when these sensors go rogue, the vehicle and the driver will have to suffer. So when the gear shift control module is faulty and affects the ignition and the exhaust system components, the OBD code P085D gets stored in the PCM.

What causes this problem with the Gear Shift Control Module "A" Performance?

• Faulty gear related shift solenoid
• Faulty gear related gear set or clutch pack
• Engine Coolant Temperature Sensor faulty
• Defective Valve Body
• Dirty transmission fluid that restricts the hydraulic passages
• Exhaust system mechanical failure
• Ignition system mechanical failure
• Broken wires and connectors in relation to the related components
• TCM/PCM failure

1. Automatic Transmission Solenoid - Check for faulty shift solenoid for the fourth gear and replace it, if defective. Buy new solenoid from us.
2. Transmission Control Module - If the transmission control module goes bad, it will be impossible for the transmission system to take any decisions and thus needs to be replaced immediately.
3. Automatic Transmission Sensor - If the transmission sensor has gone out, then there will be a problem with the engine speed and the gear transitions. Thus, replace faulty sensors at first go. Buy new sensor now!
4. Auto Transmission Torque Converter - It is important to check for faulty transmission torque converter and need to replace it immediately. Buy new torque converter now!
5. Automatic Transmission Connector - Inspect for faulty connectors to the TCM and the PCM and replace them immediately and they can be the main reason for this kind of problem. Buy new connectors now!
6. Engine Control Module - Faulty ECMs may lead to engine stalling or not starting, and check engine lights being on. Replace faulty ECM components with us.
7. Powertrain Control Module - P085D error can also relate to fault in the PCM and other electrical components. Buy all the Powertrain related parts with us.
8. Diagnostic Tool - Visit us today to grab amazing deals on quality diagnostic tools to detect and correct the OBD error codes.
9. Oxygen Sensor - Faulty oxygen sensors will affect the engine performance and the emission through exhaust system. Buy new oxygen sensor now!
10. Catalytic Converter - Defective catalytic converter will affect the exhaust system as well as increase the engine emission. Replace faulty converter now!
11. Ignition System Parts - Inspect for faulty ignition system parts that may be affecting the ignition timing. Buy new parts now!
12. Exhaust System Parts - This obd code will cause the increase in emission due to lean engine conditions. Buy new exhaust parts and replace faulty parts today!
13. Cylinder Head Gaskets - Check for leaks in the head gasket that are causing pressure release and replace damaged components now!

Our main motive is to achieve customer satisfaction and that’s why we will help you to diagnose P085D code by mentioning some major symptoms below:

Common Symptoms

• Check Engine Light will illuminate
• Vehicle will not shift properly
• Decrease in fuel economy
• Transmission Slipping

Have a look at some ways with which you can correct the P085D code:

• If the transmission has suffered damage due to a low fluid condition, first rebuild the transmission, perform a fluid flush, and replace the torque converter
• Check the wiring or connectors and replace any damaged, or faulty, wiring or connectors
• Repair any leaks if the transmission fluid looks like it is in good condition and is only low
• Replace the hydraulic pump if this component is damaged
• Repair or replace any damaged circuits or connectors
• Replace the shift solenoid, or solenoid pack if faulty
• Replace the PCM, if found faulty

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

• Visually inspect all wiring, connectors, and components associated with the transmission system. They should look for any loose, damaged, or corroded wiring, components, or connectors, replacing them if needed.
• Save the freeze frame data and any stored trouble codes on the PCM using the scanner. Clear any codes and test drive the vehicle to see if the codes return. If the code returns, check the individual auto transmission connector to see if a reference voltage or ground signal are present.
• Check the transmission fluid level and condition and lookout for a burnt or abnormal smell, which can indicate that the transmission has suffered damage from a low fluid condition. If this is the case, the mechanic should remove the transmission pan and inspect it for pieces of the clutch or other debris.
• If the transmission fluid is low, fill the transmission fluid to a point that any leaks can be detected and repaired. Once all leaks are found and fixed, the transmission fluid must be filled to an appropriate level.
• Clear the code, allow the vehicle to reach a normal operating temperature, and test drive the vehicle to see if the trouble code returns.
• If the code returns and the transmission is still slipping or hesitating, the mechanic should connect a manual pressure gauge. Using the manual pressure gauge in conjunction with a hydraulic pressure diagram, they should check the pressure of the transmission hydraulic pump. The mechanic should compare their findings to manufacturer specifications.
• If the pump checks out and the code still persists, use the digital volt/ohmmeter to test for reference voltage and ground signal at the shift solenoid. Check for circuit continuity, making sure to disconnect any related control modules to prevent memory loss.
• Use a manufacturer's wiring diagram to test all related circuits for resistance and continuity, comparing their findings to the manufacturer's specifications. If everything checks out and is in good condition, the next step is to diagnose the PCM for failure.
• Finally, once all repairs are made, clear the code and retest the system to see if the trouble code returns.

Common Mistakes When Diagnosing the P085D Code

• Some of the common mistakes done while changing diagnosing the OBD code P085D are:
• Engine Misfire problem
• Internal Transmission problem
• Wiring and connector problem
• TCM/PCM failure
• Gear shift control module defective
• Driveline problem