P06AB - OBD Trouble Code

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Every OBD-II vehicle has a catalytic convertor. This catalytic convertor has oxygen sensors both in the front and behind it. As the vehicle warms up in closed loop mode, there is a fluctuation in the upstream oxygen sensor waveform. If the car gets too heated, the TCM shuts down and the error code P06AB is set. The purpose of setting this code is to avoid any further damage to the vehicle parts.

There’s a built-in TCM temperature sensor in the control solenoid valve assembly. Its purpose is to detect the potentiality of over temperature (over and beyond the threshold of the vehicle) conditions prevailing in the Transmission Control Module or TCM. To protect itself, the TCM hence shuts down, and remains in that state till the over temperature phenomenon ceases to exists. This is a crucial step by the TCM, as it helps in reducing any further damage to it, due to overheating.

What causes this problem with the PCM/ECM/TCM Internal Temperature Sensor "B" Circuit?

• Connector is corroded or damaged
• Defectiveness found in the control module ground strap or even loosening
• Malfunctioning or damages to the wiring
• Defectiveness of the PCM module, ECM module, or Transmission control solenoid/TCM

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It is vital to know the symptoms of an issue as only then you would be able to solve the problem. The symptoms also help in getting guidance from your vehicles TSB for diagnostic steps. So that’s why we have listed out some major symptoms of OBD Code P06AB here:

Common Symptoms

• Starting problem with the engine
• Engine stalls after starting
• Incorrect shifting of transmission
• Warning light of transmission illuminated
• Check engine light is on

Want to correct the Trouble Code P06AB? Read these points mentioned below:

• Cleaning of all the corrosion found in connectors, use the right cleaning tools and material for this
• All the faulty wiring will have to be repaired or replaced as per extent of damage
• Faulty ground straps also have to be repairing or replacing
• Flash or replace the PCM, ECM or TCM as per requirement 

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It is essential to diagnose this fault code so that you can you can stop your vehicle from further damage. Here are some steps which a mechanic should follow for diagnosing the problem that triggered a P06AB code to be stored:

First, and foremost you will have to research a little in your vehicles Technical Service Bulletins or TSBs. They will guide you on the troubleshooting process as per your vehicle specifications, so ensure you find the instructions for your vehicle by year, model and power plant to be certain. The TSB reference can help you save a lot of time during the diagnosing and troubleshooting process.

Now with the help of your TSB, locate and visually inspect this circuit. Check associated wires, ground straps and also the ground wires. You are looking for damages, like scraping, rubbing, bare wires, burn spots etc. caused due to wear and tear and also unforeseen circumstances. Repair or replace these as per need, only after doing so can you move forward with the rest of the diagnosis. After repairs and replacements, move on to doing the same inspection for the connector, here your focus is to check their security, corrosive state and if there are any damaged pins that can be found. Again, rectify these issues, via visual inspection. Do this for the PCM, ECM and TCM. You will find specific technological data from your TSB, so refer it to see if there are any faults with the three modules mentioned. Accordingly move on to rectification of the PCM module, ECM module and TCM.

Common Mistakes When Diagnosing the P06AB Code

• Powertrain Control Module (PCM) has completely failed
• Wiring issue present