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.
2012 Ford Mustang Base, 2D Convertible, Automatic TransFACTORY OEM SERVICE PROCEDURE
MULTIFUNCTION Electronic Modules DTCS
SMART JUNCTION BOX (SJB) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Action |
|---|---|---|
| B106B | Tire Pressure Sensor Low Battery | REFER to WHEELS & TIRES . |
| B106D | Tire Pressure Monitor System (TPMS) Initiators Not Configured | REFER to WHEELS & TIRES . |
| B106E | Solid State Driver Disabled Due to Short Circuit | GO to PINPOINT TEST A . |
| B106F | Module Disabled Due to External Fault | GO to PINPOINT TEST A . |
| B1138 | Memory Full | REFER to ANTI-THEFT SYSTEM - PASSIVE ANTI-THEFT SYSTEM . |
| B1139 | Invalid Transmitter Identification Code | REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . |
| B1302 | Accessory Delay Relay Coil Circuit Failure | REFER to WINDOWS AND GLASS - GLASS, FRAMES AND MECHANISMS . |
| B1304 | Accessory Delay Relay Coil Circuit Short To Battery | REFER to WINDOWS AND GLASS - GLASS, FRAMES AND MECHANISMS . |
| B1317 | Battery Voltage High | GO to PINPOINT TEST B . |
| B1318 | Battery Voltage Low | GO to PINPOINT TEST C . |
| B1320 | Driver Door Ajar Circuit Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B1328 | Passenger Door Ajar Circuit Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B1331 | Decklid Ajar Rear Door Circuit Failure | REFER to INTERIOR LIGHTING SYSTEM . |
| B1342 | ECU Is Faulted | DIAGNOSE all other DTCs first. If no other DTCs are present, INSTALL a new SJB. REFER to SMART JUNCTION BOX (SJB) . TEST the system for normal operation. |
| B1352 | Ignition Key-In Circuit Failure | REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES . |
| B1472 | Lamp Headlamp Input Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1485 | Brake Pedal Input Short To Battery | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1510 | Flash To Pass Switch Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1520 | Hood Switch Circuit Open | REFER to ANTI-THEFT SYSTEM - PERIMETER . |
| B1578 | Lamp Park Input Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1688 | Lamp Dome Input Circuit Short To Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B1696 | Autolamp On Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1791 | Autolamp Sensor Input Circuit Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1793 | Autolamp Sensor Input Circuit Short to Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2008 | Wipers On Signal Circuit Short to Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2044 | Left Rear Stop Lamp Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2046 | Right Rear Stop Lamp Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2048 | Left Rear Turn Lamp Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2050 | Right Rear Turn Lamp Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2071 | Hazard Switch Signal Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2100 | Door Driver Key Cylinder Switch Failure | REFER to ANTI-THEFT SYSTEM - PERIMETER . |
| B2212 | Panel Dim Switch Out of Range | REFER to INSTRUMENT CLUSTER ILLUMINATION AND PANEL ILLUMINATION . |
| B2254 | Front Fog Lamp Switch Failure | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2276 | Less Than 2 Transmitters Programmed | REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . |
| B2281 | Right Turn Switch Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2282 | Left Turn Switch Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2425 | Remote Keyless Entry Out of Synchronization | REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . |
| B2477 | Module Configuration Failure | CARRY OUT Programmable Module Installation (PMI) on the SJB. REFER to MODULE CONFIGURATION SYSTEM . |
| B2479 | Park Brake Switch Circuit Short To Ground | REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES . |
| B2498 | Headlamp Switch Multiple Signals Input Active | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2572 | Brake Shift Interlock Output Circuit Failure | REFER to AUTOMATIC TRANSMISSION - AUTOMATIC TRANSAXLE/TRANSMISSION - EXTERNAL CONTROL . |
| B2844 | Ignition Fault | REFER to STEERING COLUMN SWITCHES . |
| B2868 | Left Front Tire Pressure Sensor Fault | REFER to WHEELS & TIRES . |
| B2869 | Right Front Tire Pressure Sensor Fault | REFER to WHEELS & TIRES . |
| B2870 | Right Rear Tire Pressure Sensor Fault | REFER to WHEELS & TIRES . |
| B2871 | Left Rear Tire Pressure Sensor Fault | REFER to WHEELS & TIRES . |
| B2872 | Tire Pressure Sensor Fault | REFER to WHEELS & TIRES . |
| B287A | Tire Pressure System Fault | REFER to WHEELS & TIRES . |
| B2A20 | Ignition Stuck in START | REFER to STEERING COLUMN SWITCHES . |
| B2A21 | One or More Configuration Files Missing or Corrupt | CARRY out Programmable Module Installation (PMI) on the SJB. REFER to MODULE CONFIGURATION SYSTEM . CLEAR the DTCs. REPEAT the self-test. If DTC B2A21 is retrieved again, INSTALL a new SJB. REFER to SMART JUNCTION BOX (SJB) . TEST the system for normal operation. |
| B2A22 | Headlamp OFF Circuit Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A23 | High Beam Input Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A24 | Turn Signal Input Circuit Failure | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A25 | Trim Panel Lock Switch Circuit Failure | REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . |
| B2A27 | Right Front Turn Lamp Circuit Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A28 | Right Front Turn Lamp Circuit Short to Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A29 | Left Front Turn Lamp Circuit Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A2A | Left Front Turn Lamp Circuit Short to Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A2B | Left Corner Lamp Output Circuit Short to Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A2C | Right Corner Lamp Output Circuit Short to Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A2E | Right Front Lamp Low Beam Circuit Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A2F | Right Front Lamp Low Beam Circuit Short to Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A30 | Left Front Lamp Low Beam Circuit Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A31 | Left Front Lamp Low Beam Circuit Short to Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B2A32 | LED Backlighting Output Circuit Open | REFER to INSTRUMENT CLUSTER ILLUMINATION AND PANEL ILLUMINATION . |
| B2A33 | LED Backlighting Output Circuit Short to Ground | REFER to INSTRUMENT CLUSTER ILLUMINATION AND PANEL ILLUMINATION . |
| B2A35 | Interior Lighting Output Circuit Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B2A36 | Interior Lighting Output Circuit Short to Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B2A38 | Floor Lamp Output Circuit Short to Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B2A3A | Puddle Lamp Output Circuit Short to Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| P062F | Internal Control Module EEPROM Error | CLEAR the DTCs. REPEAT the self-test. If DTC P062F is retrieved again, INSTALL a new SJB. REFER to SMART JUNCTION BOX (SJB) . TEST the system for normal operation. |
| C1125 | Brake Fluid Level Sensor Input Circuit Failure | REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES . |
| C2780 | ECU in Manufacturer Sub-State | REFER to WHEELS & TIRES . |
| U0155 | Lost Communication With Instrument Panel Cluster (IC) Control Module | GO to PINPOINT TEST D . |
| U2050 | No Application Present | CARRY out Programmable Module Installation (PMI) on the SJB. REFER to MODULE CONFIGURATION SYSTEM . CLEAR the DTCs. REPEAT the self-test. If DTC U2050 is retrieved again, INSTALL a new SJB. REFER to SMART JUNCTION BOX (SJB) . TEST the system for normal operation. |
| U2472 | Unexpected Ignition State | REFER to STEERING COLUMN SWITCHES . |
| U2473 | Unexpected Vehicle Speed (VSS) |
NOTE:
Sets during the self-test if vehicle speed exceeds 3 mph (5 kph) or vehicle speed cannot be determined by the SJB. VERIFY the speedometer operates correctly.If the speedometer does not operate correctly, REFER to
INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES
.If the speedometer operates correctly, the self-test is carried out while the vehicle is moving. STOP the vehicle and REPEAT the self-test. |
BODY CONTROL MODULE B (BCM-B) DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Action |
|---|---|---|
| B109F:08 | Intrusion Sensor Module: Bus Signal/Message Failures | REFER to ANTI-THEFT SYSTEM - PERIMETER . |
| B109F:49 | Intrusion Sensor Module: Internal Electronic Failure | REFER to ANTI-THEFT SYSTEM - PERIMETER . |
| B109F:55 | Intrusion Sensor Module: Not Configured | CARRY OUT Programmable Module Installation (PMI) on the BCM-B. REFER to MODULE CONFIGURATION SYSTEM . |
| B109F:97 | Intrusion Sensor Module: Component Or System Operation Obstructed Or Blocked | REFER to ANTI-THEFT SYSTEM - PERIMETER . |
| B1219:11 | Interior Boot/Trunk Release Switch: Circuit Short To Ground | REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . |
| B1265:23 | Left Rear Turn Lamp Feedback: Signal Stuck Low | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1265:24 | Left Rear Turn Lamp Feedback: Signal Stuck High | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1266:23 | Right Rear Turn Lamp Feedback: Signal Stuck Low | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1266:24 | Right Rear Turn Lamp Feedback: Signal Stuck High | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1267:11 | Convertible/Folding Top Activation Up Switch: Circuit Short To Ground | REFER to CONVERTIBLE TOP . |
| B1268:11 | Convertible/Folding Top Activation Down Switch: Circuit Short To Ground | REFER to CONVERTIBLE TOP . |
| B1269:11 | Convertible/Folding Top Fully Up Position Switch: Circuit Short To Ground | REFER to WINDOWS AND GLASS - GLASS, FRAMES AND MECHANISMS . |
| B126D:15 | Convertible/Folding Top Fully Down Position Switch: Circuit Short To Battery Or Open | REFER to WINDOWS AND GLASS - GLASS, FRAMES AND MECHANISMS . |
| B126E:23 | Right Rear Window Fully Down Feedback: Signal Stuck Low | REFER to CONVERTIBLE TOP . |
| B126E:24 | Right Rear Window Fully Down Feedback: Signal Stuck High | REFER to CONVERTIBLE TOP . |
| B126F:23 | Left Rear Window Fully Down Feedback: Signal Stuck Low | REFER to CONVERTIBLE TOP . |
| B126F:24 | Left Rear Window Fully Down Feedback: Signal Stuck High | REFER to CONVERTIBLE TOP . |
| B1270:11 | High Mounted Stop Lamp: Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1270:15 | High Mounted Stop Lamp: Circuit Short To Battery Or Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1271:11 | Left Stop/Turn Inner Lamp: Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1271:15 | Left Stop/Turn Inner Lamp: Circuit Short To Battery Or Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1272:11 | Right Stop/Turn Inner Lamp: Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1272:15 | Right Stop/Turn Inner Lamp: Circuit Short To Battery Or Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1273:11 | Right Stop/Turn Middle Lamp: Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1273:15 | Right Stop/Turn Middle Lamp: Circuit Short To Battery Or Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1274:11 | Left Stop/Turn Middle Lamp: Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1274:15 | Left Stop/Turn Middle Lamp: Circuit Short To Battery Or Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1275:11 | Left Stop/Turn Outer Lamp: Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1275:15 | Left Stop/Turn Outer Lamp: Circuit Short To Battery Or Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1276:11 | Right Stop/Turn Outer Lamp: Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1276:15 | Right Stop/Turn Outer Lamp: Circuit Short To Battery Or Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1277:11 | Reverse Lamp: Circuit Short To Ground | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1277:15 | Reverse Lamp: Circuit Short To Battery Or Open | REFER to EXTERIOR LIGHTING SYSTEM . |
| B1278:12 | Convertible/Foldable Top Up Relay: Circuit Short To Battery | REFER to CONVERTIBLE TOP . |
| B1278:14 | Convertible/Foldable Top Up Relay: Circuit Short To Ground Or Open | REFER to CONVERTIBLE TOP . |
| B1279:12 | Convertible/Foldable Top Down Relay: Circuit Short To Battery | REFER to CONVERTIBLE TOP . |
| B1279:14 | Convertible/Foldable Top Down Relay: Circuit Short To Ground Or Open | REFER to CONVERTIBLE TOP . |
| B127A:12 | Global Window Control: Circuit Short To Battery | REFER to WINDOWS AND GLASS - GLASS, FRAMES AND MECHANISMS . |
| B127A:14 | Global Window Control: Circuit Short To Ground Or Open | REFER to WINDOWS AND GLASS - GLASS, FRAMES AND MECHANISMS . |
| B127B:11 | Ambient Lighting Zone 1 Output Red LED: Circuit Short To Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B127B:15 | Ambient Lighting Zone 1 Output Red LED: Circuit Short To Battery Or Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B127C:11 | Ambient Lighting Zone 2 Output Red LED: Circuit Short To Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B127C:15 | Ambient Lighting Zone 2 Output Red LED: Circuit Short To Battery Or Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B127D:11 | Ambient Lighting Zone 3 Output Red LED: Circuit Short To Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B127D:15 | Ambient Lighting Zone 3 Output Red LED: Circuit Short To Battery Or Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B127E:11 | Ambient Lighting Zone 1 Output Green LED: Circuit Short To Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B127E:15 | Ambient Lighting Zone 1 Output Green LED: Circuit Short To Battery Or Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B127F:11 | Ambient Lighting Zone 2 Output Green LED: Circuit Short To Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B127F:15 | Ambient Lighting Zone 2 Output Green LED: Circuit Short To Battery Or Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B1280:11 | Ambient Lighting Zone 3 Output Green LED: Circuit Short To Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B1280:15 | Ambient Lighting Zone 3 Output Green LED: Circuit Short To Battery Or Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B1281:11 | Ambient Lighting Zone 1 Output Blue LED: Circuit Short To Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B1281:15 | Ambient Lighting Zone 1 Output Blue LED: Circuit Short To Battery Or Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B1282:11 | Ambient Lighting Zone 2 Output Blue LED: Circuit Short To Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B1282:15 | Ambient Lighting Zone 2 Output Blue LED: Circuit Short To Battery Or Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B1283:11 | Ambient Lighting Zone 3 Output Blue LED: Circuit Short To Ground | REFER to INTERIOR LIGHTING SYSTEM . |
| B1283:15 | Ambient Lighting Zone 3 Output Blue LED: Circuit Short To Battery Or Open | REFER to INTERIOR LIGHTING SYSTEM . |
| B1284:12 | Trunk/Boot Open Activation Request Hardwire: Circuit Short To Battery | REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . |
| B1284:14 | Trunk/Boot Open Activation Request Hardwire: Circuit Short To Ground Or Open | REFER to HANDLES, LOCKS, LATCHES AND ENTRY SYSTEMS . |
| P0801:11 | Reverse Inhibit Control Circuit: Circuit Short To Ground | REFER to REAR VIEW MIRROR . |
| P0801:12 | Reverse Inhibit Control Circuit: Circuit Short To Battery | REFER to REAR VIEW MIRROR . |
| P0801:13 | Reverse Inhibit Control Circuit: Circuit Open | REFER to REAR VIEW MIRROR . |
| P1571:12 | Brake Switch: Circuit Short To Battery | REFER to EXTERIOR LIGHTING SYSTEM . |
| P2533:14 | Ignition Switch Run/Start Position Circuit: Circuit Short To Ground Or Open | GO to PINPOINT TEST E . |
| U0140:87 | Lost Communication With Body Control Module: Missing Message | GO to PINPOINT TEST F . |
| U0155:87 | Lost Communication With Instrument Panel Cluster (IPC) Control Module: Missing Message | GO to PINPOINT TEST G . |
| U0422:68 | Invalid Data Received From Body Control Module: Event Information | This DTC is set when the BCM-B receives invalid data from the SJB. RETRIEVE and REPAIR all non-network DTCs in the SJB. REFER to the SMART JUNCTION BOX (SJB) DTC CHART in DIAGNOSIS AND TESTING . |
| U0423:68 | Invalid Data Received from Instrument Panel Cluster Control Module: Event Information | This DTC is set when the BCM-B receives invalid data from the IPC. RETRIEVE and REPAIR all non-network DTCs in the IPC. REFER to INFORMATION CENTER - INSTRUMENTATION, MESSAGE CENTER, AND WARNING CHIMES . |
| U1000:00 | Solid State Driver Protection Actived -Driver Disabled: No Sub Type Information | GO to PINPOINT TEST H . |
| U2100:55 | Initial Configuration Not Complete: Not Configured | CARRY OUT Programmable Module Installation (PMI) on the BCM-B. REFER to MODULE CONFIGURATION SYSTEM . |
| U3000:49 | Control Module: Internal Electronic Failure | ADDRESS all other DTCs first. CLEAR the DTCs. REPEAT the self-test. If DTC U3000:49 is retrieved again, INSTALL a new BCM-B. REFER to BODY CONTROL MODULE B (BCM-B) . |
| U3003:62 | Battery Voltage: Signal Compare Failure | GO to PINPOINT TEST I . |
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.