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.
Scan Tool Diagnostics
A scan tool is used to retrieve and clear DTCs. 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, instrument cluster, EBCM or SDM). 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). - Clear Codes
Will erase DTCs for system currently selected (if problem still exists in system, DTC may immediately reset).
| DTC (2) | Description | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| B1000 | BCM Malfunction | ||||||||
| B1001 | Vehicle Option Configuration Error | ||||||||
| B1369 | Ignition 0 Fault | ||||||||
| B1374 | Ignition 1 Fault (With Engine Running) | ||||||||
| B1379 | Ignition 3 Fault | ||||||||
| B2532 | Front Foglight Relay Output Short To Ground/Open | ||||||||
| B2533 | Front Foglight Relay Output Short To Battery | ||||||||
| B2558 | Interior Light Control Output Short To Battery | ||||||||
| B2575 | (3) ALC Headlight System Fault | ||||||||
| B2577 | (3) ALC Headlight Relay Output Short To Ground/Open | ||||||||
| B2578 | (3) ALC Headlight Relay Output Short To Battery | ||||||||
| B2585 | (3) Parking Light System Fault | ||||||||
| B2587 | (3) Parking Light Relay Output Short To Ground/Open | ||||||||
| B2588 | (3) Parking Light Relay Output Short To Battery | ||||||||
| B2600 | (4) DRL Error | ||||||||
| B2602 | (4) DRL Relay Output Short To Ground/Open | ||||||||
| B2603 | (4) DRL Relay Output Short To Battery | ||||||||
| B2647 | Ambient Light Sensor Short To Ground/Open | ||||||||
| B2648 | Ambient Light Sensor Short To Battery | ||||||||
| B2965 | Key-In-Ignition Fault | ||||||||
| U1001-U1088: | LOSS OF XXX COMMUNICATIONS | ||||||||
| U1300 | Class 2 Serial Data Link Low | ||||||||
| U1301 | Class 2 Serial Data Link High | ||||||||
| U2000 | Invalid BCM Transmitted SPI Data | ||||||||
| U2001 | Invalid Instrument Cluster Transmitted SPI Data | ||||||||
| U2002 | SPI Data Input Low | ||||||||
| U2003 | SPI Data Input High | ||||||||
| U2004 | SPI Data Output Low | ||||||||
| U2005 | SPI Data Output High | ||||||||
| U2006 | SPI Clock Output Low | ||||||||
| U2007 | SPI Clock Output High | ||||||||
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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.