HOW TO INSTALL CUMMINS CCV SOTF

CCV SOTF SWITCH

Tools You’ll Need

  • 8mm / 10mm socket or wrench

  • Trim tool or flathead screwdriver

  • Flashlight

  • Zip ties

  • Drill + step bit (only if adding a new switch location)

What the CCV SOTF Does (Quick Context)

  • Uses the CCV pressure signal to change tunes

  • Common on 2022+ Cummins where OBD SOTF is limited

  • Requires CCV-enabled tuning to work

  • Does not add power by itself

Step-by-Step Installation

1. Disconnect Both Batteries

  • Disconnect both negative battery terminals

  • Prevents fault codes and accidental shorts

2. Locate the CCV Sensor / CCV Tube

On 6.7L Cummins, the CCV system is located:

  • On the top/front of the valve cover

  • CCV tube runs from valve cover → intake

  • Sensor is typically mounted in or near the CCV housing

https://www.cumminsforum.com/attachments/20150923_180627-jpg.423385/

3. Unplug the Factory CCV Sensor

  • Press the locking tab

  • Pull the connector straight off

  • Inspect pins for dirt or oil

4. Install the CCV SOTF Harness (Plug-and-Play)

  • Plug the male end of the SOTF harness into the CCV sensor

  • Plug the female end into the factory wiring harness

  • Ensure both sides click and lock

Do NOT force connectors
If it doesn’t click, it’s not seated

5. Route the Switch Wiring Through the Firewall

  • Use an existing rubber firewall grommet

    • Common areas: behind brake booster or steering column

  • Push the switch wiring through carefully

  • Reseal grommet if needed

https://www.ramforum.com/data/attachments/213/213897-256652b7af239c4105a48218cae072f9.jpg

6. Mount the CCV SOTF Switch Inside the Cab

Common mounting locations:

  • Lower dash panel

  • Kick panel

  • Center console

  • Factory blank switch panel

7. Secure the Wiring

  • Zip-tie away from:

    • Exhaust components

    • Steering shaft

    • Pedals

  • Avoid sharp edges and moving parts

8. Reconnect Batteries

  • Reconnect both negative terminals

  • Tighten snug (don’t over-torque)

9. Verify Operation

  • Key ON (engine OFF)

  • Rotate switch through all positions

  • Start engine and verify:

    • No CEL

    • Normal idle

    • No warning messages

⚠️ Do NOT switch tunes under throttle
Only switch:

  • At idle

  • Or steady cruise (light throttle)

Important Notes (Do Not Skip)

  • CCV SOTF only works with CCV-enabled tuning

  • Switching under load can cause:

    • Limp mode

    • Fault codes

  • Leave switch in lowest setting on startup unless instructed otherwise by your tuner

Quick Troubleshooting

Check Engine Light

  • CCV connector not fully seated

  • Oil contamination in connector

No Tune Change

  • CCV SOTF not enabled in tuning

  • Incorrect switch wiring

Truck Goes Into Limp

  • Switch changed under throttle

  • Wrong tune configuration