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 RWDFACTORY OEM SERVICE PROCEDURE
Audio Digital Signal Processing Module (DSP)
AUDIO DIGITAL SIGNAL PROCESSING MODULE (DSP) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Perform Test |
|---|---|---|
| B1158 | Subwoofer #2 Open | Go to Pinpoint Test D . |
| B2913 | Audio Subwoofer Not Connected | Go to Pinpoint Test D . |
| B2925 | Subwoofer Speaker Short Circuit | Go to Pinpoint Test D . |
| B292A | Subwoofer #2 Speaker Short Circuit | Go to Pinpoint Test D . |
| B2965 | Audio System Speaker Circuit Fault | Go to Pinpoint Test D . |
| C1992 | Vehicle Speed Circuit Failure | DISREGARD the DTC. CLEAR the DTCs. REPEAT the self-test. |
| U0196 | Lost Communication With Entertainment Control Module - Rear (AUX) | Go to Pinpoint Test G . |
Factory Service Tools
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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.