This code could be caused by a wide variety of issues, ranging from relatively minor to major problems:
* Transmission Range Sensor (PRNDL) Problems: This sensor tells the computer what gear the transmission is in. A faulty sensor can cause this code.
* Transmission Control Module (TCM) Issues: The TCM is the "brain" of the transmission. A malfunctioning TCM can trigger P0700. This is often a more expensive repair.
* Wiring Problems: Damaged, corroded, or loose wiring between the TCM, sensors, and other components can cause intermittent or persistent problems.
* Low Transmission Fluid: While less likely to trigger *just* a P0700, low fluid levels can certainly contribute to transmission problems and eventually lead to this code.
* Faulty Transmission Solenoids or Valves: These control the hydraulic pressure within the transmission. Problems here can lead to a variety of transmission issues and result in a P0700 code.
* Internal Transmission Problems: More severe issues within the transmission itself (e.g., worn clutches, planetary gear problems) can eventually trigger this code.
What to Do:
1. Check Transmission Fluid: This is the easiest first step. Low or dirty fluid is a problem that needs to be addressed regardless of the underlying cause. Check the fluid level and condition. If it's low or dirty, have it topped off or changed.
2. Have the Code Scanned for More Specific Codes: A P0700 is a general code. A professional scan tool can often reveal more specific codes that point directly to the failing component.
3. Professional Diagnosis: Because the P0700 is so broad, professional diagnosis is strongly recommended. A qualified mechanic can use diagnostic tools to pinpoint the exact cause of the problem. Ignoring this could lead to more serious and expensive transmission damage.
Do not attempt to diagnose or repair the transmission yourself unless you have significant automotive experience, especially with automatic transmissions. These repairs can be complex and dangerous.
