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.
Retrieving DTCS
DTC can only be retrieved and cleared using an OBD-II compatible scan tool. Turn ignition on, with engine off. Connect scan tool to Data Link Connector (DLC) located under left side of instrument panel. Retrieve DTCs. See BCM DTC DEFINITIONS table. The scan tool also has several features that can be used to help locate an intermittent condition. When scan tool is used for system tests, it will display values actually seen or commanded by various systems (i.e., BCM, PCM). This will usually include the following types of information:
- Analog Data Input
Displays analog input seen by system. - Inputs/Outputs
Displays digital values as seen by system, and provides indication of whether input or output has cycled. - Special Functions (Output Controls)
Allows for outputs of system to be set at a desired value (ON or OFF). This will only indicate if BCM is sending the appropriate commands, not what action was actually taken. - Clear Codes
Will erase DTCs for system currently selected (if problem still exists in system, DTC may immediately reset).
| DTC(1) | Description | ||
|---|---|---|---|
| B1552 | Loss Of BCM Keep Alive Memory (KAM) | ||
| B1556 | BCM EEPROM Write Error | ||
| B1558 | BCM EEPROM Checksum Error | ||
| B1970 | Exterior Light Power Fault | ||
| B1971 | Inadvertent Power Fault | ||
| B1973 | High Power Control Fault | ||
| B1982 | Battery Voltage Too High | ||
| B1983 | Battery Voltage Too Low | ||
| B2470 | Daytime Running Lights Fault | ||
| B2471 | Interior Lights Fault | ||
| B2472 | Low Beam Fault | ||
| B2473 | High Beam Fault | ||
| B2476 | Parking Lights Fault | ||
| U1128 | Loss Of Serial Communications - IRC | ||
| U1255 | Generic Loss Of Serial Communications For Class 2 Devices | ||
| U1300 | Class 2 Short To Ground | ||
| U1301 | Class 2 Short To Battery | ||
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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.