Network Diagnostic Trouble Code Guides

Free step-by-step guides to diagnose Network OBD-II trouble codes. Choose your subsystem below.

Browse by Subsystem

Network Communication 9 DTC codes

All Network DTC Codes

Communication medium

U0073

The engine control module (ECM) cannot talk to other control modules on Bus A. This shuts down data ...

30–60 minutes
Communication medium

U0100

The U0100 code tells you that the engine control module (ECM) or power‑train control module (PCM) is...

30-60 minutes
Communication medium

U0101

The power‑train control module (TCM) cannot receive data from the engine control module (ECM) over t...

30‑60 minutes
Communication medium

U0121

U0121 signals that the Engine Control Module (ECM) cannot exchange data with the Anti‑Lock Braking S...

30–90 minutes (diagnosis only)
Communication medium

U0126

The PCM (power‑train control module) can’t receive data from the steering‑angle sensor module. This ...

30‑60 minutes
Communication medium

U0128

The power‑train control module (PCM) cannot receive data from the park brake control module. This us...

30-60 minutes
Communication medium

U0140

The U0140 diagnostic trouble code signals that the Powertrain Control Module (PCM) has lost communic...

30-60 minutes
Communication medium

U0155

The power‑train control module (PCM) cannot receive data from the instrument panel cluster (IPC). Th...

30‑60 minutes
Communication medium

U1000

The power‑train control module (PCM) cannot receive or send data on the vehicle’s CAN (Controller Ar...

30‑60 minutes