OBD Guide
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U1199

Invalid Or Missing Data For External Access

U1199 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For External Access. Common causes: damage to the diagnostic connector, open or short circuit in the can bus. Estimated repair cost: ~$56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
~$56 (est.)

Symptoms

  • Check Engine light comes on
  • Problems connecting diagnostic equipment
  • Malfunctions of additional equipment
  • Unstable engine operation in some modes

Causes

  • Damage to the diagnostic connector
  • Open or short circuit in the CAN bus
  • External diagnostic device malfunction
  • ECU software failure
  • Incompatible accessories

How to Fix

  1. Check the condition of the diagnostic connector
  2. Scan the CAN bus for breaks and short circuits
  3. Try different diagnostic equipment
  4. Reset errors and reboot the computer
  5. Update ECU software

Related codes

U0100U0121U0155

FAQ

What does the U1199 code mean?

U1199 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For External Access

What causes a U1199 error code?

The most common causes of U1199 include: Damage to the diagnostic connector; Open or short circuit in the CAN bus; External diagnostic device malfunction; ECU software failure.

How do I fix a U1199 diagnostic trouble code?

To fix U1199: Check the condition of the diagnostic connector. Scan the CAN bus for breaks and short circuits. Try different diagnostic equipment. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1199?

Yes, but get it checked soon

How much does it cost to fix U1199?

The estimated repair cost for U1199 is ~$56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat