OBD2 Code P0700: What It Means

Figuring out why your Check Engine Light is on means deciphering OBD-II (or “OBD2”) codes, and that can be kind … Continued

Figuring out why your Check Engine Light is on means deciphering OBD-II (or “OBD2”) codes, and that can be kind of annoying. That’s why Car Bibles did it for you! You’re welcome, now let’s get into solving your issue.

OBD2 P0700: What It Means

P0700 is a generic, general code meaning there is something wrong with the transmission control system. In other words, the automatic transmission and its controls aren’t functioning properly, and other codes might be present.

Likely Symptoms 

Here’s what you may experience due to P0700 code:

  • A Check Engine Light. This code will pop up, and possibly have more codes associated with it, pinpointing the issue.
  • Limp mode. The car might go into a limp mode, where it won’t rev past a certain RPM or achieve a speed above a certain mph.
  • Hard-shifting and generally poor drivability. The car might have trouble shifting, or generally drive rough.

Probable Causes

Here’s what could be causing the issue:

  • Faulty Transmission Control Module. The TCM might not be functioning properly.
  • Faulty transmission valve body. This might be broken and in need of replacement.
  • Damaged/worn/shorted wiring. The wiring to each of these components might be worn and in need of repair.
  • Faulty shift solenoid. The shift solenoid might not be functioning properly, causing rough shifts or slippage; the revs will jump but the car won’t move in congruence to it. Or, the transmission might not shift at all.

What Part Is Potentially Affected?

Essentially, anything that’s associated with controlling the transmission and how it shifts could be part of the problem. Seeing if any other related codes are present will help narrow down what the culprit could be.

Possible Fixes

Here are the most common fixes to remedy P0700 code:

  • Replace wiring and connectors. A multimeter can be used to test the wiring and connectors, and faulty pieces can often be easily replaced with proper wiring and shrink tubing.
  • Replace transmission fluid. The fluid might be dirty or past its service interval, and clogging up the shift solenoid.
  • Replace the shift solenoid. This could be faulty or clogged up with poor transmission fluid, gunk, or just dead.
  • Replace TCM. That Transmission Control Module is essentially the brain that controls the automatic transmission.
  • Replace transmission valve body. This is a very complex and expensive part, and should be considered once everything else is ruled out through testing and inspection.

Finding The Parts You Need

Now that you’ve figured out what’s wrong with your hooptie, let’s talk about where you’re gonna find that part’s replacement.

There are plenty of places you can buy auto parts from, but Car Bibles gets paid if you click this Advance Auto link so that’s the one we’re serving up. Advance Auto Parts also has delivery, curbside pickup, and a host of helpful diagrams to aid your repair!

Peter Nelson
Peter Nelson

Peter Nelson has been wrenching on and playing with cars since he started driving them quickly between the cones at Chicagoland autocross events in his late teens. Nowadays, he can be found wringing out his Mazda2 at tracks all over California. His writing background includes Winding Road, Donut Media, and Autolist.com. He's also an avid cyclist and '80s/'90s action film connoisseur. Contact the author here.