OBD Guide
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U1191

Lost Communication With Upper Switch Bank

U1191 is an OBD-II diagnostic trouble code meaning: Lost Communication With Upper Switch Bank. Common causes: broken or damaged wires, poor contact in connectors. Estimated repair cost: $17–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$17–56 (est.)

Symptoms

  • Inoperative Electrical Components
  • Check Engine light comes on
  • Unstable operation of vehicle systems
  • Error message on the dashboard

Causes

  • Broken or damaged wires
  • Poor contact in connectors
  • Upper Bank Switch Module Malfunction
  • Power or grounding problems
  • Engine control unit malfunction

How to Fix

  1. Check the integrity of the wiring harness
  2. Inspect and clean the connector contacts
  3. Check supply voltage and grounding
  4. Test the upper switch bank module
  5. Replace the module if necessary

Related codes

U1190U1192U1193

FAQ

What does the U1191 code mean?

U1191 is an OBD-II diagnostic trouble code that indicates: Lost Communication With Upper Switch Bank

What causes a U1191 error code?

The most common causes of U1191 include: Broken or damaged wires; Poor contact in connectors; Upper Bank Switch Module Malfunction; Power or grounding problems.

How do I fix a U1191 diagnostic trouble code?

To fix U1191: Check the integrity of the wiring harness. Inspect and clean the connector contacts. Check supply voltage and grounding. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1191?

Yes, but get it checked soon

How much does it cost to fix U1191?

The estimated repair cost for U1191 is $17–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat