OBD Guide

P038C

Ignition I Control Signal Circuit High

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Misfires
  • Reduced engine power
  • Increased fuel consumption
  • Unstable idling
  • Check Engine Light Illuminates

Causes

  • Faulty ignition coil
  • Damaged wiring harness
  • Short circuit in the circuit
  • Faulty engine control unit (ECU)

How to Fix

  1. Check the condition of the ignition coil I
  2. Inspect the wiring harness for damage
  3. Check control circuit voltage
  4. Replace faulty components
  5. Reset the error and check engine operation

Related codes

Error P038C by Vehicle Brand