OBD Guide
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U1814

Powertrain Wake-Up Communication Circuit

U1814 is an OBD-II diagnostic trouble code meaning: Powertrain Wake-Up Communication Circuit. Common causes: open or short circuit in wake-up circuit, powertrain control module (pcm) malfunction. Estimated repair cost: $17–111.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$17–111 (est.)

Symptoms

  • Engine won't start
  • Engine start delay
  • Check Engine Light Is On
  • Incorrect operation of other vehicle systems
  • Loss of communication with control modules

Causes

  • Open or short circuit in wake-up circuit
  • Powertrain control module (PCM) malfunction
  • Wiring harness damage
  • Corrosion or poor contact in connectors
  • Power or grounding problems

How to Fix

  1. Check the integrity of the wake-up circuit
  2. Inspect connectors and wiring harness for damage
  3. Check PCM power and ground
  4. Scan other modules for communication errors
  5. Replace the PCM if necessary

Related codes

U1813U1815U1816

FAQ

What does the U1814 code mean?

U1814 is an OBD-II diagnostic trouble code that indicates: Powertrain Wake-Up Communication Circuit

What causes a U1814 error code?

The most common causes of U1814 include: Open or short circuit in wake-up circuit; Powertrain control module (PCM) malfunction; Wiring harness damage; Corrosion or poor contact in connectors.

How do I fix a U1814 diagnostic trouble code?

To fix U1814: Check the integrity of the wake-up circuit. Inspect connectors and wiring harness for damage. Check PCM power and ground. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1814?

Do not drive — repair immediately

How much does it cost to fix U1814?

The estimated repair cost for U1814 is $17–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat