OBD Guide
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U1243

Invalid Or Missing Data For Exterior Environment

U1243 is an OBD-II diagnostic trouble code meaning: Invalid Or Missing Data For Exterior Environment. Common causes: outside temperature sensor malfunction, wiring harness damage. Estimated repair cost: $6–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$6–56 (est.)

Symptoms

  • Incorrect operation of automatic lighting
  • Errors in outdoor temperature readings
  • Malfunctions of the climate system
  • Malfunction indicator light comes on

Causes

  • Outside temperature sensor malfunction
  • Wiring harness damage
  • Body Module (BCM) Problems
  • Oxidation of contacts
  • Software error

How to Fix

  1. Check the outside temperature sensor and its circuit
  2. Inspect the wiring harness for damage
  3. Check contacts in connectors
  4. Read error codes in other modules
  5. Update module software

Related codes

U1241U1242U1244

FAQ

What does the U1243 code mean?

U1243 is an OBD-II diagnostic trouble code that indicates: Invalid Or Missing Data For Exterior Environment

What causes a U1243 error code?

The most common causes of U1243 include: Outside temperature sensor malfunction; Wiring harness damage; Body Module (BCM) Problems; Oxidation of contacts.

How do I fix a U1243 diagnostic trouble code?

To fix U1243: Check the outside temperature sensor and its circuit. Inspect the wiring harness for damage. Check contacts in connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1243?

Yes, but get it checked soon

How much does it cost to fix U1243?

The estimated repair cost for U1243 is $6–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat