What Is Transmission Control System Mil Request?

The P-0700 OBD2 code may be a relatively generic code and one that you should take seriously. It indicates a malfunction within the transmission system, preventing your car from changing gears properly, making you a hazard to yourself on the road. Fixes for the P-0700 code could also be specific to your vehicle’s make and model. Take this under consideration as you’re browsing your diagnosis. Follow the article to know what is transmission control system mil request and other error codes are.

The P-0700 code solutions range from simply replacing your transmission fluid to a whole overhaul of your transmission. The great news is, an OBD2 scan tool gives you all the info you would like to diagnose this trouble code.


What Is Transmission Control System Mil Request:

The P-0700 OBD2 code occurs when the system in your transmission controls detects a malfunction. The latest cars have a selected control module for the automated transition system called the transmission control module.

The TCM’s role in your system is to watch the transmission system’s sensors and send that data to the engine control module. Trouble begins when the ECM detects any malfunction when reading data, thus making error activation. Also, the check engine light, activation of this code trigger the failsafe mode. Your system will remain during this mode until the fault has been repaired and regular operation can resume.

The P-0700 code only tells there is a problem with your system. It’s your duty to touch deeper to seek out the problem’s exact source, which makes your OBD2 scan tool.

What are the symptoms of the P-0700 code?

You will likely notice drivability issues with code P-0700, mainly caused by slips within causing transmission control system mil request. The foremost common symptoms include:

  • Activation of the check engine light.
  • Activation of fail-safe mode.
  • Hesitation or other problems when changing gears.
  • Stalls and rough driving.
  • Reduced mileage.
  • Shift solenoid is flawed.

  • The engine coolant sensor is flawed.
  • Short or circuit in TCM.
  • Faults within the transmission valve body.
  • TCM is faulty.
  • Power Train Control Module is faulty.

How serious is that the P-0700 code?

The P0700 is extremely serious. Dramatical issues with your transmission system can cause trouble in changing gears If it’s an automatic transmission, potentially making your car dangerous to drive. You should stop immediately driving when P0700 activates and avoid driving aside from controlled diagnostic road tests until you’ve repaired the matter.

How to diagnose the P0700 code?

While P0700 may be a generic powertrain code is the transmission control system mil request. Check your car’s manual and look for technical service bulletins applicable to your make and model before starting your diagnosis.

1. Understand The Codes:

Scan for other trouble codes. Most of the time, P0700 is activated, but it isn’t the sole trouble code. You’ll commonly see codes associated with the shift solenoid.

  • Diagnose these codes first. Since they’re more specific, it’s often easier to locate the difficulty.
  • Use your scan tool like FIXD to read the freeze data.
  • Pay attention to the RPM, throttle posters, and engine torque reading.
  • Compare the average RPM rate.

2. Throttle Check:

Depress the throttle slowly, starting above 45mph. Read the freeze frame data as you are doing this. The Slip Speed should never be re-evaluated at 50rpm. If so, the problem is slipping gears. If the Slip Speed is steady, but the output shaft speed drags the power, the transmission is slipping internally. Diagnosing the clutch plate is a better possibility for finding a solution.

3. Fluid Levels Check:

Check your transmission fluid. It should be read and beyond debris, and therefore the reservoir should be filled sufficiently. Also, check for signs of transmission fluid on your engine components or pooled fluid beneath your car, which could indicate a leak.

Drain the transmission fluid and check it for metal flakes. These are from mechanical wear within the transmission and are often seen when the transmission is failing. If these flakes are present, they’ll have clogged the solenoid, causing it to fail. Metal flakes can also indicate your transmission must be rebuilt or replaced.

Inspect all the wiring associated with the transmission. Replace the frayed and wires and plugins.

Common Mistakes To Avoid While Diagnosing The Code:

The biggest mistake is to diagnose support your car’s symptoms instead of reading the difficulty codes. The drivability issues related to P0700 are often misinterpreted as engine misfires. With a significant code like this, it’s crucial to conduct a radical diagnosis using an OBD2 scan tool and ensure you’ve fixed the difficulty.

What Do You Have To Do To Repair The Code Error?

  • Replace any faulty or damaged wires and plugins found during your diagnosis. Ensure all connections are secure.
  • Find the source of transmission fluid leaks and replace the faulty or worn components.
  • Drain your transmission fluid completely, and then remove and replace the filter. If any is present, flush your system and put in fresh transmission fluid.
  • If there are many metal flakes in your transmission fluid, take your car to a transmission expert. There’s a more serious issue in your system that must be addressed.

  • Replace the transmission shift solenoid if it’s dirty or damaged.
  • Clear all error codes and take a test drive, replicating the conditions of the initial failure.

If the transmission control system mil request P0700 code comes back, you’ll have more complicated electrical problems. Take the car to a professional mechanic to sort out the problem completely.


Proper maintenance of your transmission is that the best, thanks to avoiding the P0700 code. Check your transmission fluid regularly and replace it when it gets dirty. If you see drips or puddles of transmission fluid in your garage or driveway, locate and fix the leak directly, albeit no transmission control system mil request trouble codes are active.

Leave a Comment