P0700 is a transmission control system fault, it is a general OBD-II code that indicates a fault in the transmission control system.
This code can be seen with the shift solenoid codes or other transmission codes.
OBD2 code description P0700 Generic
In most of the current vehicles, there is a control module for the transmission denoted as TCM.
This module is in charge of automatically detecting any fault in the automatic transmission, setting a specific code that will then reach the ECM, which in turn will indicate that something is wrong.
The TCM is in constant communication with the ECM, causing the OBD2 P0700 code to appear when both control modules detect that something is wrong with the transmission.
What does the P0700 code mean
The P0700 error code means that there is a relevant fault in the vehicle that is related to the vehicle’s transmission, and it is necessary to proceed with the detection and repair so that this does not happen to a greater extent.
It is worth noting that the P0700 code is simply informative, being used by the ECM only to indicate that the TCM throws at least one error code within its system, being necessary a more detailed diagnosis of the transmission to determine the real failure of the automotive component.
Note: Error code P0700 does not point to a direct engine failure, but rather to a general transmission failure.
What are the symptoms of the P0700 code?
- Malfunction indicator lamp (MIL) illumination.
- Driving and vehicle handling problems.
- Transmission shifting problems.
- Sudden engine shutdown in the vehicle.
- Inability to shift while driving.
- A decrease in fuel consumption.
- Sudden and perennial blocking of the transmission in first gear.
- It usually takes a long time for the vehicle to shift gears.
What causes the P0700 code?
- Faulty or damaged transmission control module.
- Presence of short or open circuit within the TCM.
- Serious problems in the vehicle’s transmission.
- Problems or faults in the ECM that reflect false positives with this error code.
How do I fix code p0700? [ P0700 code solutions]
- Transmission Control Module (TCM) Replacement
- Repair or replace faulty wiring
- Valve body replacement
- Transmission shift solenoid replacement
Common errors when diagnosing P0700 code
Errors are made when all steps are not performed or not performed at all. Although the vehicle may have a typical repair that corrects the P0700 code, this may not be the case in all circumstances, so the diagnosis is performed in stages.
How serious is the P0700 code?
P0700 could indicate serious transmission problems or the future of the transmission. This code can cause serious driving problems, so caution should be exercised.
Do not drive the vehicle if it has shifting problems or if it is stuck in gear, as this will cause further damage and pose a road safety hazard.
Additional comments on code P0700
The P0700 code accuses a failure in the automatic transmission control system, this code is only informative of the failure in the transmission and does not specify what the problem is, the symptoms are the check engine light on and driving problems with the transmission.
The Transmission Control Module (TCM) monitors the operation of sensors and actuators relating to transmission control.
When the TCM detects a malfunction with the control, the signal is sent to the Engine Control Module (ECM) to activate the check engine light or service engine soon light.
The ECM stores the code P0700 and this means that the TCM has detected a malfunction with the transmission controls.
Final Thoughts – P0700 Code
Usually, when the transmission system is faulty, metal particles are seen in the fluid. These can clog the shift solenoids and valve body, resulting in the P0700 code.
If you find excessive metal buildup in the transmission itself, transmission wear is probably the culprit. In this case, the entire transmission system needs to be replaced.
Finally, a word about typical P0700 diagnostic errors. Unless you are a mechanic or have extensive automotive knowledge, it is best to have your vehicle inspected and repaired by a professional.
This is because the P0700 code is often combined with other fault codes, making it more difficult and time-consuming to repair than other codes.