Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Ford Expedition 4WDFACTORY OEM SERVICE PROCEDURE
Audio Control Module (ACM)
AUDIO CONTROL MODULE (ACM) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Perform Test |
|---|---|---|
| B1136 | Audio Steering Wheel Switch #2 Circuit Failure | Go to Pinpoint Test J . |
| B1154 | Subwoofer #1 Short to Ground | Go to Pinpoint Test F . |
| B1155 | Subwoofer #1 Short to Battery | Go to Pinpoint Test F . |
| B2103 | Antenna Not Connected | Go to Pinpoint Test A . |
| B2204 | GPS Antenna Connection Open or Short | Go to Pinpoint Test O . |
| B2404 | Audio Steering Wheel Switch Circuit Fault | Go to Pinpoint Test J . |
| B2633 | Driver-Front Microphone Circuit Failure | Go to Pinpoint Test N . |
| B2913 | Audio Subwoofer Not Connected | Go to Pinpoint Test F . |
| B2965 | Audio System Speaker Circuit Fault | For vehicles with a bench seat, go to Pinpoint Test B
. For vehicles without a bench seat or THX® audio system, go to Pinpoint Test C . For vehicles with THX® audio system, go to Pinpoint Test D . |
| U0155 | Lost Communication With Instrument Panel Cluster (IC) Control Module |
NOTE:
If no related concern is currently present, disregard the DTC. If the speed sensitive volume does not operate correctly, go to Pinpoint Test R
.If the navigation is inaccurate, go to Pinpoint Test S
. |
| U0159 | Lost Communication With Parking Assist Control Module (PAM) | DISREGARD the DTC. CLEAR the DTCs. REPEAT the self-test. |
| U0193 | Lost Communication With Digital Audio Control Module (SDARS) | Go to Pinpoint Test K . |
| U0196 | Lost Communication With Entertainment Control Module - Rear (AUX) | Go to Pinpoint Test G . |
| U0197 | Lost Communication With Telephone Control Module | DISREGARD the DTC. CLEAR the DTCs. REPEAT the self-test. |
| U0238 | Lost Communication With Digital Audio Control Module "D" (DSP) | Go to Pinpoint Test E . |
| U2473 | Unexpected Vehicle Speed (VSS) | If the speed sensitive volume is inoperative, go to Pinpoint Test R
. If the navigation is inaccurate, go to Pinpoint Test S . |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.