The immobilizer will not communicate with ECU?

2002 HONDA CIVIC
225,000 MILES • 1.4L • 4 CYL • 2WD • MANUAL
Avatar
DENNIS ALFORD
  • MEMBER
  • 3 POSTS
I replaced the immobilizer and the ECU my cars in the Honda dealership when they plug their scanner, and it will not communicate with the ECU they currently have three of them with the same problem and mine has been there 5 weeks now.
Jun 13, 2023 at 2:39 PM
Advertisement
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

When you say the ECU was replaced, are you referring to the PCM/ECM? I ask because the immobilizer is integral to the ECM (or PCM with auto trans).

Did you replace the immobilizer receiver inside the bezel around the ignition switch?

Let me know.

Take care,

Joe
Jun 13, 2023 at 9:02 PM
Avatar
DENNIS ALFORD
  • MEMBER
  • 3 POSTS
Yes, ECU had 5 speed stick.
Jun 14, 2023 at 2:56 AM
Avatar
DENNIS ALFORD
  • MEMBER
  • 3 POSTS
ECU behind glove box changed, immobilized changed.
Jun 14, 2023 at 5:48 AM
Avatar
JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
When you say immobilizer, are you referring to the sensor at the ignition switch? I ask because both of my manuals are saying it is integral to the PCM.

Joe
Jun 15, 2023 at 10:32 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.