OBD Guide
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B2193

Chain Of ECM-IMMU

B2193 is an OBD-II diagnostic trouble code meaning: Chain Of ECM-IMMU. Common causes: open or short circuit in wiring harness between ecm and immu, immobilizer module (immu) malfunction. Estimated repair cost: $56–222.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–222 (est.)

Symptoms

  • Engine won't start
  • Check Engine Light Is On
  • The car goes into emergency mode

Causes

  • Open or short circuit in wiring harness between ECM and IMMU
  • Immobilizer module (IMMU) malfunction
  • Problems with the engine control module (ECM)
  • Poor contact in ECM or IMMU connectors

How to Fix

  1. Check the integrity of the wiring harness between the ECM and IMMU
  2. Inspect ECM and IMMU connectors for oxidation or damage
  3. Check the power and ground of the IMMU module
  4. Test the IMMU module for serviceability
  5. Replace IMMU or ECM if necessary

Related codes

B2194P0513P0633

FAQ

What does the B2193 code mean?

B2193 is an OBD-II diagnostic trouble code that indicates: Chain Of ECM-IMMU

What causes a B2193 error code?

The most common causes of B2193 include: Open or short circuit in wiring harness between ECM and IMMU; Immobilizer module (IMMU) malfunction; Problems with the engine control module (ECM); Poor contact in ECM or IMMU connectors.

How do I fix a B2193 diagnostic trouble code?

To fix B2193: Check the integrity of the wiring harness between the ECM and IMMU. Inspect ECM and IMMU connectors for oxidation or damage. Check the power and ground of the IMMU module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2193?

Yes, but get it checked soon

How much does it cost to fix B2193?

The estimated repair cost for B2193 is $56–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat