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Home/DTC Codes/Nissan/Altima/2007-2012 2.5L I4/B0421
B0421

ABS Warning Lamp Circuit

2007-2012 Nissan Altima 2.5L I4

Moderate SeverityBodyGeneric (SAE)

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

Nissan 200SX

1995-1998 1.6L I4 GA16DE

Nissan 200SX SE-R

1995-1998 2.0L I4 SR20DE

Nissan 240SX

1995-1998 2.4L I4 KA24DE

Nissan 300ZX

1990-1996 3.0L V6 VG30DE

Nissan 300ZX Twin Turbo

1990-1996 3.0L Twin-Turbo V6 VG30DETT

Nissan 350Z

2003-2006 3.5L V6 VQ35DE

Nissan 350Z

2007-2009 3.5L V6 VQ35HR

Nissan 370Z

2009-2020 3.7L V6 VQ37VHR

Common Questions

What does code B0421 mean on a 2007-2012 Nissan Altima?

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 Nissan Altima?

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 2007-2012 Nissan Altima?

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

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