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.
2007 Mazda B2300 AutomaticFACTORY OEM SERVICE PROCEDURE
Communication Device DTCS
COMMUNICATION DEVICES DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description | Source | Action |
|---|---|---|---|
| B1202 | Fuel Sender Circuit Open | Instrument Cluster | See PINPOINT TEST 21: INCORRECT FUEL GAUGE INDICATION , . |
| B1204 | Fuel Sender Circuit Short to Ground | Instrument Cluster | See PINPOINT TEST 21: INCORRECT FUEL GAUGE INDICATION , . |
| B1317 | Battery Voltage High | Instrument Cluster | See CHARGING SYSTEM PINPOINT TEST 3: CHARGING SYSTEM OVERCHARGES (BATTERY VOLTAGE IS GREATER THAN 15.5 VOLTS) , . |
| B1318 | Battery Voltage Low | Instrument Cluster | See CHARGING SYSTEM PINPOINT TEST 1: BATTERY IS DISCHARGED OR BATTERY VOLTAGE IS LOW , . |
| B1342 | ECU is Defective | Instrument Cluster | Clear all DTCs. Retrieve the DTCs. If DTC B1342 is still present, install a new instrument cluster. see INSTRUMENT CLUSTER . Test the system for normal operation. |
| B1363 | Ignition Start Circuit Failure | Instrument Cluster | See PINPOINT TEST 23: DTC B1363 - IGNITION START CIRCUIT FAULT , . |
| B2143 | NVM Memory Failure | Instrument Cluster | See PINPOINT TEST 5: THE ODOMETER IS INOPERATIVE , . |
| B2207 | ECU ROM Checksum | Instrument Cluster | Clear all DTCs. Retrieve the DTCs. If the DTC B2207 is still present, install a new instrument cluster. see INSTRUMENT CLUSTER . Test the system for normal operation. |
| B2477 | Module Configuration Failure | Instrument Cluster | Reconfigure the instrument cluster. See MODULE CONTROLLED FUNCTIONS , . |
| B2675 | Trip Reset Button Stuck | Instrument Cluster | Verify that there is no interference between the instrument cluster lens or mask and the trip reset button. If OK, install a new instrument cluster. see INSTRUMENT CLUSTER . Test the system for normal operation. |
| C1221 | ABS Warning Lamp Output Circuit Short to Ground | Instrument Cluster | See PINPOINT TEST 16: BRAKE WARNING INDICATOR IS NEVER ON , . |
| C1226 | Brake Warning Lamp Output Circuit Short to Ground | Instrument Cluster | See PINPOINT TEST 8: ANTI-LOCK BRAKE SYSTEM (ABS) WARNING INDICATOR IS NEVER/ALWAYS ON , . |
| C2784 | RAM Checksum Failure | Instrument Cluster | Clear all DTCs. Retrieve the DTCs. If DTC C2784 is still present, install a new instrument cluster. see INSTRUMENT CLUSTER . Test the system for normal operation. |
| U0102 | Lost Communication With the Transfer Case Control Module | Instrument Cluster | See PINPOINT TEST 19: 4WD AND 4WD LOW INDICATOR IS NEVER/ALWAYS ON , . |
| U0140 | Lost Communication With the Body Control Module (GEM) | Instrument Cluster | Monitor the instrument cluster indicators and warning indicators for correct operation. If any indicators or warning indicators do not function correctly, See SYMPTOM TROUBLESHOOTING CHART - INSTRUMENT CLUSTER , . If all indicators are functioning correctly, clear the DTCs. Repeat the self test, If DTC U0140 returns, install a new SJB. See SMART JUNCTION BOX (SJB) , . |
| U0151 | Lost Communication With the Restraints Control Module (RCM) | Instrument Cluster | See PINPOINT TEST 20: AIR BAG WARNING INDICATOR IS NEVER/ALWAYS ON , . |
| U0294 | Lost Communication With the Powertrain Control Module (PCM) | Instrument Cluster | Monitor the instrument cluster gauges, indicators and warning indicators for correct operation. If any gauges indicators or warning indicators do not function correctly, See SYMPTOM TROUBLESHOOTING CHART - INSTRUMENT CLUSTER , . If all indicators are functioning correctly, clear the DTCs. Repeat the self test, If DTC U0294 returns, install a new PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION , . |
| U2023 | Fault Received From External Node | Instrument Cluster | See PINPOINT TEST 11: MALFUNCTION INDICATOR LAMP (MIL) INDICATOR IS NEVER ON , . |
| U2050 | No Application Present | Instrument Cluster | Reflash the instrument cluster. If the DTC occurs after a software reflash, reflash the instrument cluster again. If the DTC is present after each attempt to reflash, install a new instrument cluster. see INSTRUMENT CLUSTER . Test the system for normal operation. |
| U2472 | Unexpected Ignition State | Instrument Cluster | Clear all DTCs. Repeat the instrument cluster self-test. If DTC U2472 is still present, install a new smart junction box (SJB). See SMART JUNCTION BOX (SJB) , . Test the system for normal operation. |
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.
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