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 Mustang Base, 2D Convertible, AutomaticFACTORY OEM SERVICE PROCEDURE
Module Communications Network
COMMUNICATION NETWORK DTC LIST
| DTC | Description | Source | Perform Test |
|---|---|---|---|
| U0073 | Control Module Communication Bus A Off | ABS module | DTC U0073 indicates the module could not communicate on the network at a point in time. The fault is currently not present. CLEAR the DTC. REPEAT the network test with the scan tool. |
| U0073 | Control Module Communication Bus A Off | Instrument cluster (IC) | DTC U0073 indicates the module could not communicate on the network at a point in time. The fault is currently not present. CLEAR the DTC. REPEAT the network test with the scan tool. |
| U0073 | Control Module Communication Bus A Off | Smart junction box (SJB) | DTC U0073 indicates the module could not communicate on the network at a point in time. The fault is currently not present. CLEAR the DTC. REPEAT the network test with the scan tool. |
| U0140 | Lost Communication With Body Control Module (GEM) | Audio control module (ACM) | REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. |
| U0155 | Lost Communication With Instrument Panel Cluster (IC) Control Module | ACM | REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. |
| U0159 | Lost Communication With Parking Assist Control Module (PAM) | ACM | DISREGARD this DTC. |
| U0184 | Lost Communication With Radio (ACM) | Satellite digital audio receiver system (SDARS) module | REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. |
| U0193 | Lost Communication With Digital Audio Control Module (SDARS) | ACM | REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. |
| U0196 | Lost Communication With Entertainment Control Module - Rear (AUX) | ACM | DISREGARD this DTC. This vehicle is not equipped with an auxiliary ACM. |
| U0197 | Lost Communication With Telephone Control Module | ACM | DISREGARD this DTC. This vehicle is not equipped with a telephone control module. |
| U0197 | Lost Communication With Telephone Control Module | SDARS module | DISREGARD this DTC. This vehicle is not equipped with a telephone control module. |
| U0238 | Lost Communication With Digital Audio Control Module "D" (DSP) | ACM | DISREGARD this DTC. This vehicle is not equipped with a networked audio digital signal processing (DSP) module. |
| U0249 | Lost Communication With Entertainment Control Module - Rear "B" (RCU) | ACM | DISREGARD this DTC. This vehicle is not equipped with a rear entertainment module (RETM). |
| U1900 | CAN Communication Bus Fault-Receive Error | ABS module | Go to Symptom Chart for module that failed network test. |
| U1900 | CAN Communication Bus Fault-Receive Error | IC | Go to Symptom Chart for module that failed network test. |
| U1900 | CAN Communication Bus Fault-Receive Error | SJB | Go to Symptom Chart for module that failed network test. |
| U2011 | Module Transmitted Invalid Data (Non-SCP) | ABS module | RETRIEVE and FOLLOW DTCs from the PCM. |
| U2023 | Fault Received From External Node | IC | RETRIEVE AND FOLLOW non-network DTCs from module with non-network fault code present. REFER to MULTIFUNCTION ELECTRONIC MODULES article. |
| U2033 | VSM Communication Link Failure | SJB | The communication network to the overhead console is not accessible through the vehicle data link connector (DLC). REFER to ANTI-THEFT - PERIMETER article. |
| U2473 | Unexpected Vehicle Speed (VSS) | ACM | REFER to INFORMATION AND ENTERTAINMENT SYSTEMS article. |
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.