P0700 🟠 Élevé ⚠️ Do not drive

Transmission Control System Fault

The automatic gearbox control unit has detected an internal fault. This code often comes with additional P07xx codes that identify the specific problem.

💷

Average repair cost

£60 — £1800

🔍 Symptoms

  • → AT or gearbox warning light on
  • → Check engine light on
  • → Harsh or refused gear changes
  • → Gearbox stuck in limp mode

⚙️ Common Causes

  1. 1Low or degraded gearbox oil (common cause)
  2. 2Faulty shift solenoids
  3. 3Failed TCM
  4. 4Gearbox speed sensor fault

🔧 Recommended Fixes

  1. 1Check and change automatic transmission fluid ATF (~£60-120)
  2. 2Read associated P07xx codes with a multi-system scanner
  3. 3Diagnose with a specialist

🛒 Recommended Parts (Amazon UK)

Automatic transmission fluid ATF~£15-40/L
View on Amazon UK →
Multi-system OBD2 scanner (gearbox)~£45-70
View on Amazon UK →

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Frequently Asked Questions

Can I clear this code without fixing it?

Yes, but it will return if the underlying issue isn't fixed. Clearing a code only tells you if the problem is permanent or intermittent.

Will this code fail an MOT?

Yes — this code will likely cause an MOT failure. Get it repaired before your test.