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.
2014 Ford Expedition Limited, 4WDFACTORY OEM SERVICE PROCEDURE
Audio Rear Control Unit (RCU) Module
DTC INDEX
| 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 AC . |
| 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 ) (Navigators without navigation) | GO to Pinpoint Test AU . |
| U2050 | No Application Present | REFER to MODULE CONFIGURATION . |
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.