OBD Guide
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U1798

Lack of Acknowledgment For External Access Doors

U1798 is an OBD-II diagnostic trouble code meaning: Lack of Acknowledgment For External Access Doors. Common causes: broken or damaged wiring harness, corrosion of contacts in connectors. Estimated repair cost: $17–89.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–89 (est.)

Symptoms

  • External access doors do not work
  • Error message on the dashboard
  • Inability to remotely control doors
  • Intermittent operation of the access system

Causes

  • Broken or damaged wiring harness
  • Corrosion of contacts in connectors
  • Door control module malfunction
  • System power problems
  • Software error in the control unit

How to Fix

  1. Check the integrity of the wiring harness
  2. Clean contacts in connectors
  3. Check the door module power supply
  4. Test and replace the control module if necessary
  5. Update the control unit firmware

Related codes

U1797U1799U1800

FAQ

What does the U1798 code mean?

U1798 is an OBD-II diagnostic trouble code that indicates: Lack of Acknowledgment For External Access Doors

What causes a U1798 error code?

The most common causes of U1798 include: Broken or damaged wiring harness; Corrosion of contacts in connectors; Door control module malfunction; System power problems.

How do I fix a U1798 diagnostic trouble code?

To fix U1798: Check the integrity of the wiring harness. Clean contacts in connectors. Check the door module power supply. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1798?

Yes, but get it checked soon

How much does it cost to fix U1798?

The estimated repair cost for U1798 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat