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.
2002 Chevrolet Impala LSFACTORY OEM SERVICE PROCEDURE
Body Control Module DTCS
BODY CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC B1000 | CONTROL MODULE MALFUNCTION |
| DTC B1007 | ELECTRONICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY WRITE ERROR |
| DTC B1009 | CHECKSUM ERROR IN CONTROL MODULE |
| DTC B1339 | DEVICE POWER NO. 3 CIRCUIT OPEN |
| DTC B1349 | DEVICE GROUND NO. 1 (CHASSIS GROUND NO. 1) CIRCUIT OPEN |
| DTC B1440 | POWER MODE MASTER INPUT CIRCUIT MISMATCH |
| DTC B1477 | RETAINED ACCESSORY POWER CIRCUIT LOW |
| DTC B1478 | RETAINED ACCESSORY POWER CIRCUIT HIGH |
| DTC U1000 & U1255 | CLASS 2 COMMUNICATION MALFUNCTION |
| DTC U1001-U1254 | LOSS OF U1XXX COMMUNICATIONS |
| DTC U1300 | CLASS 2 DATA LINK SHORTED TO GROUND |
| DTC U1301 | CLASS 2 DATA LINK SHORTED TO POWER |
| DTC U1305 | CLASS 2 DATA LINK SHORTED TO GROUND/POWER |
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.