Error Code P085A: What It Means & What To Do?

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Is the car’s transmission continuously slipping along with sluggish acceleration? Is there a problem of decreased fuel economy along with vehicle not starting? Is the car’s check engine light illuminated on the dashboard? All these are an indication towards a problematic transmission system and incorrect gear shift control module, thus resulting in OBD code P085A error getting stored in the powertrain control module (PCM).

This diagnostic fault code is a generic powertrain code, which means that it would apply to the OBD-II equipped vehicles. The specific repair steps can vary as it depends upon the vehicle make and model.

If the PCM and the TCM (Transmission Control Module) are not able to interpret the request of the gear shift by the driver the error code gets stored in the system. This means that the system can shift into wrong gears and sometimes doesn’t shift at all. There can also be many technical failures with regards to TCM like blown fuses, solenoids, circuits, sensors and much more in severe cases.

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

• Faulty Gear Shift Control Module “B” Communication Circuit
• Malfunctioning Transmission Control Module
• There can be inoperative Speed Sensors
• Transmission Solenoids might be flawed
• Some issues related to the Powertrain Control Module
• Wiring and connector issue

1. Automatic Transmission Solenoid - Check for damaged transmission solenoids and replace them immediately. Buy new solenoids now!
2. Transmission Control Module - Sometimes the module itself can be faulty, causing disruption in performance. Thus, replace faulty modules now!
3. Automatic Transmission Sensor - It is important to note that the transmission sensor plays a vital role in the working of the TCM in relation to the PCM as well. Thus, replace faulty sensors now!
4. Auto Transmission Torque Converter - Check for the faulty transmission torque converter and replace it immediately. Buy new torque converter from us now!
5. Automatic Transmission Connector - Faulty or damaged connectors will cause performance issues and thus should be replaced at first instance for proper functioning of the PCM and the TCM.
6. Ignition System Parts - This error code can also be due to affected ignition timing and thus might need certain components to be replaced. Buy new ignition system parts from us!
7. Exhaust System Parts - There can also be instances of increased emissions from the exhaust and might need examination for repairs and replacements. Thus, check and replace faulty components today!
8. Cylinder Head Gaskets - Leakages through cylinder heads must be taken seriously and thus will need immediate replacement. Buy new cylinder head gaskets now!
9. Engine Control Module - Faulty ECM can flash and store wrong OBD error. It’s better to get the faulty electricals replaced as soon as possible.
10. Powertrain Control Module - Damaged PCM hampers the engine timing. Find all the Powertrain related parts with us.
11. Diagnostic Tool - Find high grade diagnostic tools to detect the OBD error code from us. Visit us today to grab amazing deals.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P085A here:

Common Symptoms

• Harsh shifting
• Transmission slippage
• Transmission overheating
• Decreased fuel efficiency
• An OBD stored code in the PCM
• Illuminated malfunction indicator lamp

Here are some ways with the help of which you will be able to correct the OBD Code P085A.

Checking for transmission fluid or changing the transmission fluid

• Defective shift solenoid replacement
• Replacing or reprogramming Transmission Control Module
• Replacement of Gear Shift Control Module
• Faulty wiring and/or connectors for a damaged transmission control circuit replacement

There is no need to be anxious as Parts Avatar – Car Parts Online is here to help you out! We have high grade Transmission, Gear Shift Control Module, PCM, TCM, Four-Wheel Drive Switch, Actuator, Sensor, Solenoid, Wiring Harness, Connector, Ohmmeter, Automatic Transmission System, Electronic Pressure Regulator, Ignition, Exhaust System, Cylinder Head Gasket and a lot more for our precious customers.

It is essential to diagnose this fault code. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P085A code to be stored:

• Make use of 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.
• First check the level and quality of the transmission fluid. If the fluid is low, add more and retest the system.
• If the transmission fluid appears dirty or contaminated, and/or it smells burnt, the mechanic will flush the system, change the transmission fluid, clear the code, and retest once more.
• Inspect and test the transmission for internal mechanical problems, circuit problems, and issues with the shift solenoid. After each repair, they will clear all codes and retest the vehicle to see if the P085A code appears again.
• Check for leakages through head gaskets and repair or replace as required.
• Al do inspect for increased emission through exhaust system that might require assistance in terms on any mechanical failure.
• Never rule out the possibility if TCM/PCM failure that might require replacement and reprogramming.

Common Mistakes When Diagnosing the P085A Code

The most common mistake while diagnosing P085A code is misdiagnosis of an engine misfiring issue or a problem with the vehicle’s driveline. If the system is not thoroughly inspected and diagnosed, it can also look like an internal transmission problem when it’s actually a much simpler and less expensive issue.