P0700 – Meaning, Causes, Symptoms, & Fixes

Code P0700 Definition

Transmission Control System Malfunction

Code P0700 Meaning

Many cars have a control module for the automatic transmission called the transmission control module (TCM). The TCM monitors the sensors and actuators relating to transmission control and communicates with the Engine Control Module (ECM) to inform it of any possible issues with the automatic transmission control module. The trouble code P0700 is set whenever the TCM detects a malfunction with the transmission controls.

Symptoms

  • Check Engine Light
  • Drivability issues
  • Bad fuel economy
  • Transmission shifting problems
  • Fail safe mode

Causes

  • Defective shift solenoids
  • Defective engine coolant sensor
  • Shorted or open circuit Transmission Control Module (TCM)
  • Faulty Transmission Control Module (TCM)

Code P0700 Severity – Severe   

The vehicle should avoid being driven when returning the trouble code P0700. It could get caught in one gear and cause not only a safety hazard for you but for those around you as well.

Code P0700 Common Diagnosis Mistakes

Diagnosing as an engine misfire or internal transmission problem before testing looking at freeze frame data.

Code P0700 Diagnosis Steps

  • Tools Needed to Diagnose:

How To Diagnose P0700

  1. Check freeze frame data. Pay close attention to the engine load (torque), throttle position, RPM, and road speed by using your FIXD sensor and app’s freeze frame data
    1. Compare the RPM input speed and compare the RPM output speed on a flat, smooth surface.
    2. When comparing the torque converter RPM to the Input Shaft RPM keep an eye out for a Converter Slip Speed PID or Parameter Identification. To test this, gradually depress the throttle starting above 45mph. If it is function properly, the Slip Speed should never be above 50 RPM. If the Slip Speed increases when gradually depressing the throttle while above 45 mph, then you know you have a slipping Converter Clutch.
      1. If you are doing this test and the Slip Speed stays steady but the transmission Output Shaft Speed and MPH start to decrease, then you know that you have an internally slipping transmission (usually because of worn Clutch Packs or Sprag Clutches.
    3. Check transmission fluid to make sure that it is not dirty (should be red not black) and at a sufficient level. Replace if necessary.
    4. If these steps do not clear your Check Engine Light, you may need to visit a mechanic because there may be internal electrical issues.
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Comments 9

Shawn padilla

August 3, 2018

Ok so if I get a new the tcm module replaced could that be the problem I don’t want to spend that money on something that won’t fix it I just need my car fixed

FIXD Marketing

August 3, 2018

Hi Shawn,

Before replacing your TCM, we recommend following the diagnosis steps that we have provided so that you do not spend money on parts that will not fix the problem. Let us know what you find!

The FIXD Team

Omar

September 24, 2018

Hi shawn I’m having some problem with my transmission,I’m getting error codes p0700 and p2723 can you help me with that?

Teresa K Nye

August 17, 2018

I have replaced 3 TCM sensors..I think they were bad when I got them..one fell apart when I put it on..the last one fixed the problem for about a week..then the throttle sensor came up as code on engine light..then the TCM came back up..What can I do? For a 2007 Suzuki Forenza..automatic.

Ankurkumar Patel

August 20, 2018

I have erred code 0700 do anyone know how will cost me to fix this’ll?

Bob

November 28, 2018

depends on what is throwing the code and where you get it repaired. Shop rate vary – 75 to 125 an hour. plus parts.

Sga

August 28, 2018

Hi, you said one reason could be coolant sensor, can you explain how the coolant affects the transmission module? My vehicle had less coolant than normal, I had this p0700 issue, I filled it up the coolant but still getting the problem. When I turn off the engine light by scanner it drives good until the engine light turns on again. Just feel limp when start driving, rest it drives good as normal. Other codes I get p1603 and u0101. Thanks

Brian Barrette

September 2, 2018

what did you find

Bob

November 28, 2018

Mechanic wants to do a Flush. Is this the best first course of action?