What are the common causes of P038D?

An open in the ignition J control wire. A failed ignition coil on the J circuit. A broken or pushed pin at ignition J. A dead driver in the ignition module or ECM. A harness break inside the insulation.

Test the ignition J control wire for continuity. Check the ignition J connector for a pushed or broken pin. Swap a known good coil onto the J circuit. Look for a break in the ignition J harness. Replace the coil or module if the control wire tests good. Clear the code and retest.

P038D

Ignition J Control Signal Circuit/Open

System: Ignition and misfire (P code)
Lamp: Check Engine Light
Category: Powertrain - Ignition

What it means

P038D means Ignition J Control Signal Circuit/Open.

Check these first

An open in the ignition J control wire
A failed ignition coil on the J circuit
A broken or pushed pin at ignition J
A dead driver in the ignition module or ECM
A harness break inside the insulation

What to do next

Test the ignition J control wire for continuity
Check the ignition J connector for a pushed or broken pin
Swap a known good coil onto the J circuit
Look for a break in the ignition J harness
Replace the coil or module if the control wire tests good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.