P0700 Code Symptoms and Causes | How to Fix P0700 Code?

P0700 is set when the Powertrain Control Module (PCM) detects a malfunction in the transmission control system. This malfunction causes the vehicle to set a Check Engine Light and trigger a failsafe mode. This article mainly explains the symptoms and causes of the P0700 code.

P0700 Definition

Transmission Control System Malfunction

What Does Code P0700 Mean?

The trouble code P0700 indicates that there’s a malfunction in the Transmission Control Module (TCM) of your vehicle. The TCM monitors the vehicle’s transmission and works with the Powertrain Control Module (PCM) and Engine Control Module (ECM) to shift gears when necessary. It’s an integral part of any modern automatic transmission.

P0700 code

When a vehicle’s PCM detects a serious operational fault within any of its corresponding modules, a check engine light is illuminated to draw awareness to the issue at hand.

In the case of diagnostic trouble code P0700, a vehicle’s PCM has recognized an operational fault within the transmission’s control system, through which information is sent and received.

In most cases, a fault of this nature negatively impacts a transmission’s ability to function as intended. As a result, the affected vehicle typically enters “limp mode,” thereby limiting its power until the underlying issue is resolved.

Symptoms of Code P0700

 The symptoms of P0700 vary according to the vehicle model. Following are the most common symptoms of trouble code P0700:

  • Shifting issues
  • Intermittent driveability issues
  • Poor fuel economy
  • Slipping transmission
  • Onset of failsafe or “limp” mode
  • Engine stalling
  • Additional transmission codes
  • Check engine light
  • Reduction in engine performance

Read More: Symptoms and causes of bad ECU

Causes of Code P0700

The P0700 code can literally mean any problem with the transmission. To get more information, you must also read the TCM codes. The following are the most common causes of diagnostic trouble code P0700:

  • Malfunctioning shift solenoids
  • Broken wirings to transmission
  • Damaged Valve body
  • Low transmission fluid level
  • Damaged wires between TCM and ECM
  • Faulty transmission control module (TCM)

Read More: Symptoms and Causes of Low Transmission Fluid

Common P0700 Code Diagnostic mistakes

A widespread diagnostic mistake regarding the P0700 code is starting your troubleshooting without checking the TCM trouble codes. The engine control module stores the p0700 code because it says another code is stored in the transmission control module.

Get a scanner that can handle reading from the transmission control module and check what it says before doing anything else.

How to diagnose the P0700 Code?

  • Firstly, hook up a scan tool to the vehicle and check for all codes present. If P0700 is found, it is generally not alone.
  • Check all the freeze frame data for all codes to see under what circumstances the Check Engine Light was set.
  • Next, clear the code and take the vehicle for a road test to duplicate the concern.
  • Once this is performed, a visual inspection must be performed of the transmission and all wiring harnesses of the transmission.
  • If your diagnostic tool is compatible with reading data from the transmission control module, but now it can’t communicate with the TCM at all – there is a risk that there is a problem with the wirings between the ECM and TCM. It can also be a power–ground problem, CAN-bus, or a fried TCM.
  • Lastly, use a scan tool to monitor transmission information while driving, such as solenoid operation and the condition of the valve body.
  • Additionally, it is wise to assess the state of your vehicle’s transmission fluid. Check to ensure that this fluid is filled to full operating capacity while also ensuring that it does not appear overly dark in color or have a foul, burnt odor.

How serious is the P0700 Code?

The P0700 indicates a serious problem with your vehicle that could prevent your car from adequately changing gears. This makes the vehicle dangerous to drive. You should not drive your vehicle and have it inspected and repaired by a qualified mechanic as soon as possible.

P0700 Code Repair Cost

The repair or fixing cost of the P0700 code depends on your vehicle model, labor cost, and the nature of the repair. However, the average cost to replace your car’s TCM is from $490 to $920. In this cost, the average cost of the labor is from $70 to $160 per hour, while the part itself costs from $420 to $760.

The following table explains the replacement costs of some other parts that may help to fix the P0700:

Valve body replacement290$ to 720$
Transmission fluid replacement110$ to 210$
Transmission shift solenoid replacement140$ to 310$

FAQ about P0700

What is P0700 Code?

P0700 is set when the PCM detects a problem in your vehicle’s transmission control system. This issue causes the vehicle to set a Check Engine Light and trigger a failsafe mode. Once the failsafe mode is set, it will remain until the fault is repaired or normal operation is detected.

Can you drive with a P0700 code?

The P0700 indicates a serious problem with your vehicle that could prevent your car from adequately changing gears. This makes the vehicle dangerous to drive. In the case of the P0700 code, it is recommended that you do not drive your vehicle and have it inspected and repaired by a qualified mechanic as soon as possible.

What repairs can fix the P0700 code?

  • Replace Shift Solenoid
  • Replace the transmission control module
  • Inspect and change the transmission fluid
  • Replace Valve body
  • Inspect and repair the damaged or broken wires

How to clear code P0700?

To clear the P0700 code, you need to use an OBD2 scanner. You might need an enhanced scanner to read and clear the trouble codes in the transmission control module. Remember that just clearing the code will not repair the problem.

Can low transmission fluid cause a P0700 code?

The P0700 code can also be triggered if the fluid is low or the transmission is failing. Your transmission needs clean, full fluid to run properly. Low or dirty fluid can cause your transmission to overheat, resulting in excess friction between moving parts.

Where is the transmission control module located?

The transmission control module can often be found below the cover at the back of the transmission case. It should be just below the engine control module’s position. Sometimes it’s found under the center console in the interior or even under the hood near the battery or inner fender panel.

Does low battery affect automatic transmission problems?

A weak battery or low battery voltage can cause the transmission to enter into fail-safe mode. This will cause a loss of power because the transmission will be locked in third gear.

What could cause a P0700 code?

A failing transmission can cause the P0700 code. Mechanical wear causes excessive metal buildup in the transmission, which means that the transmission needs to be rebuilt or replaced. A defective coolant sensor or metal flakes in the transmission fluid may also trigger the P0700 code.

What causes a transmission control module to fail?

Usually, what causes a transmission control module to fail is voltage overload. When this happens, other transmission components of the vehicle start malfunctioning.

Will a failing transmission throw a code?

Codes indicating transmission problems fall under the category of Powertrain or “P” codes. If your vehicle is throwing codes and the first three digits are P06, P07, or P09, it almost certainly indicates a tranny or transmission problem.

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