OBD Guide
ENFRDEESPT

P1923

Engine Control Module Malfunction

P1923 is an OBD-II diagnostic trouble code meaning: Engine Control Module Malfunction. Common causes: internal ecm malfunction, ecm power or ground problems. Estimated repair cost: $167–556.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$167–556 (est.)

Symptoms

  • Engine won't start
  • Loss of engine power
  • Unstable engine operation
  • Check Engine Light Is On
  • Dips during acceleration

Causes

  • Internal ECM malfunction
  • ECM power or ground problems
  • Damaged ECM wiring harness
  • Short circuit in ECM circuit
  • ECM software failure

How to Fix

  1. Check ECM power and ground
  2. Inspect the wiring harness for damage
  3. Check ECM for internal faults
  4. Reflash or replace ECM if necessary
  5. Check and eliminate possible short circuits

Related codes

P0600P0601P0602

FAQ

What does the P1923 code mean?

P1923 is an OBD-II diagnostic trouble code that indicates: Engine Control Module Malfunction

What causes a P1923 error code?

The most common causes of P1923 include: Internal ECM malfunction; ECM power or ground problems; Damaged ECM wiring harness; Short circuit in ECM circuit.

How do I fix a P1923 diagnostic trouble code?

To fix P1923: Check ECM power and ground. Inspect the wiring harness for damage. Check ECM for internal faults. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1923?

Do not drive — repair immediately

How much does it cost to fix P1923?

The estimated repair cost for P1923 is $167–556. Actual cost depends on your vehicle, location, and labor rates.

FRDEESPT

See also: Russian version · NationStat