OBD Guide
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U11C1

Reductant Control Module Received Implausible Data From ECM/PCM

U11C1 is an OBD-II diagnostic trouble code meaning: Reductant Control Module Received Implausible Data From ECM/PCM. Common causes: damage to the wiring harness between modules, oxidation or poor contact 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

  • Check Engine Light Is On
  • Reduced engine power
  • Increased fuel consumption
  • SCR error messages on the instrument panel
  • Problems with the exhaust gas cleaning system

Causes

  • Damage to the wiring harness between modules
  • Oxidation or poor contact in connectors
  • Software errors in ECM/PCM
  • Reagent control module malfunction
  • Problems with module power supply

How to Fix

  1. Check the integrity of the wiring between the modules
  2. Inspect and clean the contacts in the connectors
  3. Check error codes in ECM/PCM
  4. Perform diagnostics on the reagent control module
  5. If necessary, update the module software

Related codes

U11C0U11C2P20EE

FAQ

What does the U11C1 code mean?

U11C1 is an OBD-II diagnostic trouble code that indicates: Reductant Control Module Received Implausible Data From ECM/PCM

What causes a U11C1 error code?

The most common causes of U11C1 include: Damage to the wiring harness between modules; Oxidation or poor contact in connectors; Software errors in ECM/PCM; Reagent control module malfunction.

How do I fix a U11C1 diagnostic trouble code?

To fix U11C1: Check the integrity of the wiring between the modules. Inspect and clean the contacts in the connectors. Check error codes in ECM/PCM. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U11C1?

Yes, but get it checked soon

How much does it cost to fix U11C1?

The estimated repair cost for U11C1 is $17–89. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat