Guide To P085C OBD Error Code Solutions

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Is your Check Engine Light illuminated on the car’s dashboard? Are you experiencing sudden drop in the fuel economy with stalling of the engine? Or is there engine stalling and gear slipping? Then, there might be a possibility of an issue with the transmission control module of the car thus indicating OBD Code P085C error.

The Powertrain Control Module (PCM) monitors the Gear Shift Control Module. The PCM sets the OBD-II error code when there is a problem communicating with the Gear Shift Control Module.

The Transmission Control Module (TCM) and the engine computer (PCM) constantly communicate to each other to ensure that the correct gear shift and performance. If the TCM and PCM fails to correctly interpret the transmission request, it will affect the fuel economy, exhaust system and ignition timing thus leading to OBD code P085C getting stored.

What causes this problem with the Gear Shift Control Module "B" Communication Circuit High?

• Low transmission fluid level
• Dirty transmission fluid
• Transmission oil leak
• Transmission clutch problems
• Low oil pressure
• Transmission control module failure
• Transmission speed sensor failure
• PCM failure
• Corroded connections or pins
• Wring issue (corrosion, chafed, melted)

1. Automatic Transmission Solenoid - Faulty solenoids will lead to improper functioning of the transmission system and thus must be replaced if found so.
2. Transmission Control Module - TCM modules are important to converse with the PCM and take appropriate decisions in the matters of vehicle performance. Repair or replace it as required.
3. Automatic Transmission Sensor - Replace faulty transmission sensors and check for the performance and data transmissions. Buy new transmission sensor now!
4. Auto Transmission Torque Converter - Damaged torque converter will cause performance issues and affect the drivability. Thus, replace is, if needed.
5. Automatic Transmission Connector - Connectors are really important as they connect of system to another and ensure stable functioning environment. Thus, check for faulty connectors and wiring damages as required.
6. Powertrain Control Module - Faulty PCM can easily distorted engine timing causing frequent halting. Find all the Powertrain related parts with us.
7. Diagnostic Tool - In order to detect the error, one needs high grade diagnostic tools. Visit us today to grab amazing deals.
8. Oxygen Sensor - Check for faulty oxygen sensor and replace it immediately if found faulty. Buy new oxygen sensor now!
9. Catalytic Converter - If the catalytic converter is faulty, it can lead to increased exhaust emission and might need replacement. Buy new catalytic converter now!
10. Ignition System Parts - Faulty ignition coils, wires, spark plugs can affect the ignition timing and must be replaced now! Buy new parts now!
11. Exhaust System Parts - Inspect for faulty exhaust parts and check for exhaust leaks and replace faulty components now!
12. Cylinder Head Gaskets - Cylinder leaks will cause lean conditions and thus should be replaced immediately. Buy new head gaskets now!

Willing to know some common symptoms of OBD Code P085C? Your wish is our demand. Have a look at them below:

Common Symptoms

• Intermittent condition
• Lack of engine power
• Slow speeds
• Transmission slipping
• Transmission shifts erratic
• Harsh shifts

We have listed out some ways which would help you to correct the occurrence of OBD Code P085C. They are mentioned here as follows:

• Shift solenoid replacement
• Powertrain control module replacement
• Transmission control module replacement
• Replacing gear shift control module
• Faulty wiring and connectors replacement
• Adding or replacing the transmission fluid and filter
• Overhauling the current transmission
• Installing a brand-new transmission

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 Transmission, Gear Shift Control Module, PCM, TCM, Oxygen Sensor, Catalytic Converter, Cylinder Head Gasket, Exhaust System 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:

• You will need a digital volt ohm meter (DVOM) for the complete test. Continue through the tests until the problem is confirmed. You will also need a basic OBD code scanner to reset the computer and erase the code.
• Begin by checking the levels of the transmission oil. Visually inspect the transmission itself for damage. Inspect the vehicle housing for signs of cracks or damage. If there are any cracks that may or may not be leaking, the transmission should be replaced. Replace any damaged seals. Locate speed sensors on the transmission and inspect sensors and connectors for signs of damage. If any damage present, repair or replace.
• Inspect for optimal oil pressure. Using an oil pressure gauge, test the transmission oil pressure. Make sure to use the transmission pressure test port. Connect gauge to the test port and start vehicle. Ensure there are no leaks at connection.
• Check for faults in the speed sensors. Unplug the transmission speed sensors. Using multimeter, you will need to test resistance values within the sensor. If values aren’t within specifications, replace sensors and clear codes.
• Identify wires involved in speed sensor circuits. Using multimeter check for continuity, shorts and open in the wires involved. This will include the ECM connector so make sure battery is disconnected before testing. Repair any problems in the circuit and clear codes.
• Test the TCM by back probing the connector and measuring electrical values to ensure it is functioning as it should.
• Also check for faults in the ignition system and exhaust system, causing lean engine condition, reduced performance, affected fuel economy and increased emission.

Common Mistakes When Diagnosing the P085C Code

When diagnosing a P085C code the most common misdiagnosis would be to have the transmission replaced assuming that internal damage has occurred. It is important to note that the gear shift control module is faulty before replacing it. It is best to make sure the transmission actually needs to be replaced before adding even more to the cost of repairs.