P0700: Transmission Control System Malfunction

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What does the P0700 error code mean?

The error code P0700 is a diagnostic trouble code for a transmission control system malfunction. This code appears when the transmission control module (TCM) detects a problem within the transmission control system. The TCM is a key component in your vehicle's ability to shift gears, and it communicates with the engine control module to optimize vehicle performance. When the TCM sends this error code to the engine control module, it's indicating that it has found a fault that could affect the transmission's ability to function properly.

Why is the P0700 issue important?

The P0700 code points to potential issues within the transmission control system, which is critical for the vehicle's operation. A malfunctioning transmission can lead to a number of problems, like increased emissions, decreased fuel efficiency, poor vehicle performance, and — most importantly — reduced safety. Ignoring this issue can result in significant transmission damage, leading to costly repairs down the line.

Can I safely drive my car with this error code?

This is not a good idea. While you might not immediately notice severe drivability issues, the P0700 code indicates that there's something wrong with your transmission. Driving a vehicle with a potential transmission malfunction can lead to further damage or a breakdown, which could leave you stranded.

Common symptoms of the P0700 code

  • Check engine light is illuminated
  • Transmission slipping while shifting gears
  • Rough or irregular shifting
  • Decreased fuel efficiency
  • The vehicle may go into “limp” mode

Diagnosing the P0700 error code

A mechanic will start by using a scan tool to read the fault codes from the TCM. The mechanic may also check the transmission fluid level and quality since low or dirty fluid can cause transmission issues. Further diagnosis may include inspecting the wiring and connectors for damage or corrosion and checking for other codes that might give clues about the underlying problem. It's a comprehensive process that aims to pinpoint the exact cause of the malfunction.

Repairing the P0700 error code

The exact approach depends on the diagnosis. Possible repairs include:

  • Replacing or repairing damaged wiring or connectors
  • Changing dirty or low transmission fluid
  • Replacing faulty sensors
  • In severe cases, rebuilding or replacing the transmission may be necessary

Sometimes, simply resetting the TCM and clearing the code is enough if no further issues are found. However, it's crucial to address any identified problems to prevent the code from returning and to ensure the longevity and safety of your vehicle.

Edmunds.comby

This story was created with generative AI and was reviewed and fact-checked by our staff of editors and experts.

Steven Ewingedited by

Steven Ewing has worked in the automotive industry since 2003. In that time, he's written thousands of articles and tested just as many vehicles. Steven is Edmunds' director of editorial content and has previously been on staff at Winding Road magazine, Autoblog, Motor1.com, CNET, and was the U.S. correspondent for Top Gear magazine. Steven has also contributed to Automobile magazine, Car and Driver, The Drive, Jalopnik, Porsche Panorama, and dozens of other publications. In his spare time, Steven loves to play the drums, cook, and drive his 1999 BMW M Roadster to local punk shows.

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