OBD Guide
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P1378

Fuel Injection Control Module Circuit Low Voltage

P1378 is an OBD-II diagnostic trouble code meaning: Fuel Injection Control Module Circuit Low Voltage. Common causes: malfunction of the fuel injector control module, wiring damage. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • Unstable engine operation
  • Increased fuel consumption
  • Power Loss
  • Difficulty starting the engine
  • Check Engine Light Is On

Causes

  • Malfunction of the fuel injector control module
  • Wiring damage
  • Poor connection in the circuit
  • Relay or fuse problems
  • Engine ECU malfunction

How to Fix

  1. Check the condition of wiring and connections
  2. Check relays and fuses
  3. Diagnose the control module
  4. If necessary, replace the control module
  5. Check engine ECU

Related codes

P1379P1380P1377

Error P1378 by Vehicle Brand

Volkswagen

FAQ

What does the P1378 code mean?

P1378 is an OBD-II diagnostic trouble code that indicates: Fuel Injection Control Module Circuit Low Voltage

What causes a P1378 error code?

The most common causes of P1378 include: Malfunction of the fuel injector control module; Wiring damage; Poor connection in the circuit; Relay or fuse problems.

How do I fix a P1378 diagnostic trouble code?

To fix P1378: Check the condition of wiring and connections. Check relays and fuses. Diagnose the control module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1378?

Yes, but get it checked soon

How much does it cost to fix P1378?

The estimated repair cost for P1378 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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