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.
2009 Ford Expedition 4WDFACTORY OEM SERVICE PROCEDURE
Audio Rear Control Unit (RCU) Module DTC Chart
AUDIO REAR CONTROL UNIT (RCU) MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Action |
|---|---|---|
| B1318 | Battery Voltage Low | Go To PINPOINT TEST AL . |
| B1342 | ECU is Faulted |
NOTE:
Repair all other DTCs before diagnosing DTC B1342. CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved again, INSTALL a new audio Rear Control Unit (RCU) module. REFER to AUDIO REAR CONTROL UNIT (RCU) MODULE
. TEST the system for normal operation. |
| B2477 | Module Configuration Failure | REFER to MODULE CONFIGURATION . |
| B2924 | Audio Button Stuck | Go To PINPOINT TEST AG . |
| U0140 | Lost Communication With Body Control Module (GEM ) | Go To PINPOINT TEST AR . |
| U0184 | Lost Communication With Radio (ACM ) | Go To PINPOINT TEST AT . |
| U0193 | Lost Communication With Digital Audio Control Module (SDARS ) | Go To PINPOINT TEST AU . |
| U2050 | No Application Present | REFER to MODULE CONFIGURATION . |
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.