P0700 - Transmission Control System Malfunction
Plain-English meaning
The Powertrain Control Module (PCM) has detected a fault in the Transmission Control Module (TCM) or the transmission control system and has set the P0700 code.
What to check first
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What not to replace yet
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Stop driving when
If the vehicle exhibits severe transmission slipping, loss of drive, or if the transmission warning light is flashing, stop driving and seek professional assistance to prevent further damage.
Related symptoms
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Owner steps
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Likely causes
Faulty Transmission Control Module (TCM) (medium)
Wiring issues between PCM and TCM (medium)
Faulty transmission range sensor (medium)
Internal transmission problems (medium)
Blown transmission fuse or relay (medium)
Poor electrical connections or corrosion (medium)
Shop steps
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Follow-up questions
Are there any additional transmission-related diagnostic trouble codes present?
Have you noticed any changes in transmission shifting behavior?
When did the Check Engine or Transmission Warning Light first appear?
Has the transmission fluid been checked or changed recently?
Are there any signs of fluid leaks under the vehicle?