Powered by Mustang Enthusiasts - Call Now (866) 507-3786

What is a Mustang CCRM?

Created by Neal Jimenez / 2 min read
Date Created: 8/31/2022
Last Updated: 11/2/2022

Find out what your 1994-2004 Mustang CCRM does and where it is located with our in-depth dive into the Mustang CCRM!

Viewing this install and using the information shared is subject to the terms set forth here - View the LMR Install Instructions Disclaimer.

FOLLOW: 94 04 mustang , tech guide , tech

  • What is a Mustang CCRM?

All You need to know about the Mustang CCRM

What does a CCRM do?

The Mustang CCRM, also known as the Constant Control Relay Module, is a module found on the 1994-2004 SN95 Mustang that provides vehicle power to the powertrain control module (PCM) for various components on the Mustang. These components include the following:

  • Cooling Fan 
  • A/C Clutch
  • Fuel Pump Driver Module (FPDM) power supply 
  • PCM Power relay

If you experience any issue where the PCM, cooling fan, air conditioner compressor clutch, or fuel pump is not getting power, the CCRM may be the culprit. 

Where is the CCRM Located?

The CCRM will vary depending on the model and year of your SN95 and New Edge Mustang. 

  • 1996-2004 - The CCRM is located on the inner fender of the passenger side. Removal of the wheel and inner fender liner is required to access the CCRM wiring. 
  • 1994-1995 - The CCRM is mounted to the overfill mounting bracket in front of the radiator fan. 

How do I change the CCRM?

Once you determine the location of your CCRM based on the year model above, follow these instructions to replace your CCRM.

  • Disconnect both battery cables from the battery.
  • 1996-2004 - removal of the wheel and inner splash shield will allow you to gain access to the CCRM. 1994-1995 Mustang will have the CCRM on the overfill bracket.
  • Remove the wiring harness connection using a 5mm socket. Once loosened completely, you can remove the wiring harness from the CCRM by pulling the harness away from the module. 
  • Remove the two 5.5mm bolts that retain the CCRM to the mounting bracket. This will allow you to remove the CCRM from the bracket completely. 1994-1995 Mustangs, removing the overfilled bracket will ease the installation, but it is unnecessary with the correct tools.

Are All CCRM Interchangeable?

It is always good to double-check the part number when installing a replacement CCRM. V6 and V8 CCRMs are different, and 2001-2004 are different from the older 1994-2000. 


Thumbnail image of the author of this article, Neal Jimenez.

About the Author

Neal has owned a 1996 3.8L, 2003 3.8L (Cobra Swapped), 2003 GT, 1998 3.8L (4.6L SOHC Swapped), 1990 GT Hatchback, 1990 GT Convertible, 2006 GT Single Turbo, and 2011 Twin Turbo/Cammed GT. Read more...