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Home/DTC Codes/Chevrolet/Impala/2010-2010 3.5L V6/U0121
U0121

Lost Communication with ABS Module

2010-2010 Chevrolet Impala 3.5L V6

High SeverityNetworkGeneric (SAE)

The 2010 Chevrolet Impala is equipped with a 3.5L V6 engine. Below you'll find detailed u0121 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.

Description

Cannot communicate with the Anti-lock Brake System module.

Symptoms

  • ABS light on
  • Traction control disabled
  • Stability control disabled

Common Causes

  • ABS module power failure
  • CAN bus wiring
  • ABS module failure
  • Fuse blown

Diagnostic Steps

  1. Check ABS fuses
  2. Test module power and ground
  3. Check CAN wiring
  4. Try direct communication

Repair Notes

Check fuses first. Common on water-damaged vehicles.

Related Codes

C0060ABS Motor CircuitU0100Lost Communication with ECM/PCM

Other Network Codes

U0121 on Other Vehicles

Chevrolet Astro

1996-1996 4.3L V6 Vortec

Chevrolet Astro

1997-1997 4.3L V6 Vortec

Chevrolet Astro

1998-1998 4.3L V6 Vortec

Chevrolet Astro

1999-1999 4.3L V6 Vortec

Chevrolet Astro

2000-2000 4.3L V6 Vortec

Chevrolet Astro

2001-2001 4.3L V6 Vortec

Chevrolet Astro

2002-2002 4.3L V6 Vortec

Chevrolet Astro

2003-2003 4.3L V6 Vortec

Common Questions

What does code U0121 mean on a 2010-2010 Chevrolet Impala?

U0121 stands for "Lost Communication with ABS Module". Cannot communicate with the Anti-lock Brake System module.

What are the symptoms of U0121 on a Chevrolet Impala?

Common symptoms of U0121 include: ABS light on, Traction control disabled, Stability control disabled.

What causes U0121 on a 2010-2010 Chevrolet Impala?

Common causes of U0121 include: ABS module power failure, CAN bus wiring, ABS module failure, Fuse blown.

Last updated: March 2026

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