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Home/DTC Codes/Chevrolet/Impala/2017-2017 2.5L I4 Ecotec/B0421
B0421

ABS Warning Lamp Circuit

2017-2017 Chevrolet Impala 2.5L I4 Ecotec 🇩🇪

Moderate SeverityBody

Description

Malfunction in the ABS warning lamp circuit. The lamp may not illuminate or may stay on incorrectly.

Symptoms

  • ABS light does not come on during bulb check
  • ABS light always on
  • Cannot determine ABS system status
  • Light flickering

Common Causes

  • Burnt out lamp
  • Cluster fault
  • ABS module lamp driver failure
  • Wiring issue

Diagnostic Steps

  1. Check lamp during key-on bulb check
  2. Scan ABS module for codes
  3. Test lamp drive circuit
  4. Inspect wiring from ABS module to cluster

Repair Notes

Replace ABS warning lamp or repair wiring circuit.

Related Codes

B0400Instrument Cluster General MalfunctionB0420Check Engine Lamp Circuit

Other Body Codes

B0421 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 B0421 mean on a 2017-2017 Chevrolet Impala?

B0421 stands for "ABS Warning Lamp Circuit". Malfunction in the ABS warning lamp circuit. The lamp may not illuminate or may stay on incorrectly.

What are the symptoms of B0421 on a Chevrolet Impala?

Common symptoms of B0421 include: ABS light does not come on during bulb check, ABS light always on, Cannot determine ABS system status, Light flickering.

What causes B0421 on a 2017-2017 Chevrolet Impala?

Common causes of B0421 include: Burnt out lamp, Cluster fault, ABS module lamp driver failure, Wiring issue.

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