All Body Computer DTC Codes — Complete OBD-II Diagnostic Guide (2026)

This comprehensive reference covers every Body Computer diagnostic trouble code (DTC) — 1 codes total. Each code includes what triggers it, common symptoms, step-by-step diagnostic procedures, and repair guidance.

1DTC Codes
1Medium

Detailed DTC Code Guides

B1342: The B1342 code signals an internal hardware fault inside the Body Control Module (BCM). The module’s processor or memory can’t reliably control lights, door locks, and other comfort functions, so it shuts down to protect the vehicle.

medium ⏱️ 30‑60 minutes ⚠️ You can keep driving, but expect loss of body‑module features; limit use until repaired.

Learn what B1342 means, why your Body Control Module fails, and how to fix it. Includes step‑by‑step DIY, cost estimates, emissions impact, and...

Diagnostic steps:
  1. Visual Inspection
  2. Scan Live Data
  3. Power Supply Test
  4. ...see all 5 steps →
Read full diagnostic guide →

Understanding Body Computer Codes

Body Computer diagnostic trouble codes are set by your vehicle's onboard computer (ECU/PCM) when it detects a problem in the computer system. Here's what you need to know:

  • How codes are triggered: Sensors monitor computer performance. When readings fall outside expected ranges, the ECU stores a DTC and illuminates the check engine light.
  • Freeze frame data: When a code is set, the ECU also records engine conditions at that moment. This data helps pinpoint the exact cause.
  • Pending vs. confirmed: A code becomes "confirmed" after multiple drive cycles with the same fault. Pending codes may clear on their own.

Tools You'll Need for Diagnosis

  • OBD-II scanner — Essential for reading and clearing codes. A basic scanner works for most codes.
  • Digital multimeter — For testing sensor voltages, resistance, and continuity.
  • Repair manual — Vehicle-specific wiring diagrams and specifications.
  • Safety equipment — Gloves, safety glasses, jack stands for under-vehicle work.

When to See a Mechanic

While many computer codes can be diagnosed at home, see a professional if:

  • The code is critical severity — driving may cause further damage
  • Multiple related codes are present — suggests a deeper systemic issue
  • You don't have the tools or experience for the required diagnostic steps
  • The repair involves fuel system, exhaust, or catalytic converter work