OBD Guide
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U1221

Invalid Or Missing Data For Interior Lamp Outage

U1221 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Interior Lamp Outage. Common causes: interior light bulbs burnt out, wiring harness problems. Estimated repair cost: $1–56.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$1–56 (est.)

Symptoms

  • Interior lights may not turn on
  • Some comfort functions do not work
  • Check Engine light comes on
  • Possible problems with other systems
  • Errors in the memory of other modules

Causes

  • Interior light bulbs burnt out
  • Wiring Harness Problems
  • Body electronics module malfunction
  • Short circuit in lighting circuit
  • Software error in the control unit

How to Fix

  1. Check the condition of the interior lighting lamps
  2. Inspect the wiring harness for damage
  3. Check fuses related to interior lighting
  4. Diagnose the body electronics module
  5. Reset the error and check for its reappearance

Related codes

U1201U1222U1231U1232

FAQ

What does the U1221 code mean?

U1221 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Interior Lamp Outage

What causes a U1221 error code?

The most common causes of U1221 include: Interior light bulbs burnt out; Wiring Harness Problems; Body electronics module malfunction; Short circuit in lighting circuit.

How do I fix a U1221 diagnostic trouble code?

To fix U1221: Check the condition of the interior lighting lamps. Inspect the wiring harness for damage. Check fuses related to interior lighting. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1221?

Yes, but get it checked soon

How much does it cost to fix U1221?

The estimated repair cost for U1221 is $1–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat