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.
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HOMESERVICE MANUALSBUICK1998REGAL 25TH ANNIVERSARY EDITIONREPAIR AND DIAGNOSIS (SINGLE PAGE)GENERAL INFORMATIONDTC INDEXBODY CONTROL MODULE DTCS
1998 Buick Regal 25th Anniversary Edition
Body Control Module DTCS
1998 Buick Regal 25th Anniversary EditionSECTION Body Control Module DTCS
BODY CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| B0603 | BCM INTERNAL MEMORY MALFUNCTION (WRITE ERROR) |
| B0605 | BCM INTERNAL MEMORY MALFUNCTION (CHECKSUM ERROR) |
| B0608 | BCM POWER MODING ERROR |
| B0702 | RAP RELAY CIRCUIT (SHORT TO GROUND OR OPEN) |
| B0703 | RAP RELAY CIRCUIT (SHORT TO VOLTAGE) |
| B0807 | BATTERY FOR DOOR LOCK CIRCUIT (OPEN) |
| B0812 | COURTESY LIGHTS BATTERY FEED CIRCUIT (OPEN) |
| B0823 | DOOR LOCK ACTUATOR GROUND FEED CIRCUIT (OPEN) |
| B0828 | THEATER DIMMING GROUND CIRCUIT (OPEN) |
| B1802 | COURTESY LIGHTS CIRCUIT (SHORT TO GROUND) |
| B2202 | DRIVER'S DOOR UNLOCK CIRCUIT (SHORT TO GROUND OR OPEN) |
| B2203 | DRIVER'S DOOR UNLOCK CIRCUIT (SHORT TO VOLTAGE) |
| B2403 | FOGLIGHT SWITCH CIRCUIT (SHORT TO VOLTAGE) |
| B2417 | DRL CONTROL MODULE CIRCUIT (SHORT TO GROUND OR OPEN) |
| B2418 | DRL CONTROL MODULE CIRCUIT (SHORT TO VOLTAGE) |
| B2452 | THEATER DIMMING NO. 1 CIRCUIT (SHORT TO GROUND OR OPEN) |
| B2453 | THEATER DIMMING NO. 1 CIRCUIT (SHORT TO VOLTAGE) |
| B2457 | THEATER DIMMING NO. 2 CIRCUIT (SHORT TO GROUND OR OPEN) |
| B2458 | THEATER DIMMING NO. 2 CIRCUIT (SHORT TO VOLTAGE) |
| B2528 | HORN RELAY CIRCUIT (SHORT TO VOLTAGE) |
| B2721 | PASS-KEY(R) II DETECTION CIRCUIT (OUT OF RANGE) |
| B2722 | PASS-KEY(R) II DETECTION CIRCUIT (SHORT TO GROUND) |
| B2723 | PASS-KEY(R) II DETECTION CIRCUIT (SHORT TO VOLTAGE OR OPEN) |
| B2735 | PASS-KEY(R) II PROGRAMMING MODE ACTIVE |
| B2739 | KEY-IN-IGNITION FAULT |
| B2802 | RFA LINK CIRCUIT (SHORT TO GROUND) |
| B2803 | RFA LINK CIRCUIT (SHORT TO VOLTAGE) |
| B2805 | RFA PROGRAMMING/DIAGNOSTIC MODE MESSAGE NOT RECEIVED |
| B2806 | RFA LINK PARITY ERROR |
| U1016 | PCM CLASS 2 SOURCE ID 10 |
| U1040 | EBTCM CLASS 2 SOURCE ID 28 |
| U1064 | LOSS OF BCM SOURCE ID 40 |
| U1096 | INSTRUMENT PANEL CLASS 2 SOURCE ID 60 |
| U1255 | LOSS OF CLASS 2 SERIAL DATA FAULT (GENERAL) |
| U1300 | CLASS 2 CIRCUIT (SHORT TO GROUND) |
| U1301 | CLASS 2 CIRCUIT (SHORT TO VOLTAGE) |
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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.