P1378

Fuel Injection Control Module Circuit Low Voltage

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

Check the condition of wiring and connections
Check relays and fuses
Diagnose the control module
If necessary, replace the control module
Check engine ECU

Related codes

P1379 P1380 P1377

Error P1378 by Vehicle Brand