P0700

What it means

This is a general code indicating that your car's main computer (PCM) has detected a fault within the transmission control system. It usually means there's another, more specific transmission-related code stored in the Transmission Control Module (TCM).

Is it safe to drive?

P0700 indicates a problem with the transmission, which can lead to unpredictable shifting, loss of power, or complete transmission failure. Driving with this code can cause further, more severe damage to the transmission and is unsafe.

Most likely causes

• Other Transmission-Related DTCs

  high

  P0700 is almost always accompanied by one or more specific transmission codes (e.g., P07XX series) that pinpoint the actual issue.

• Faulty Transmission Control Module (TCM)

  medium

  The TCM itself can fail, leading to various transmission problems and triggering P0700.

• Wiring Harness Issues (open, short, corrosion)

  medium

  Damaged wiring or connectors between the TCM and other transmission components or the PCM can cause communication errors.

• Internal Transmission Mechanical Failure

  low

  Severe internal transmission issues can trigger the TCM to report a malfunction.

Related help

• Full P0700 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?