What does B101D mean on a Chevy?

B101D. Electronic Control Unit Hardware Malfunction. Applies to Silverado, Sierra, Tahoe, Suburban, Impala, Malibu, Corvette, Escalade.

What causes B101D on a Chevy?

Internal hardware fault in the OnStar vehicle communication interface module (VCIM) Extreme low-voltage or dead-battery event falsely setting B101D F0 in the BCM Internal memory or checksum failure inside the electronic control unit Water intrusion or corroded connector at the module

How do I fix B101D on a Chevy?

Read the symptom byte with a Tech2 or GDS2 to identify the failing internal circuit Clear the code first; if B101D F0 clears with no symptoms, do not replace the module Check battery condition and charging system output before condemning any module Inspect module connectors for moisture and corrosion Replace the affected module only if the code resets as current with good voltage and wiring

Code

B101D

Electronic Control Unit Hardware Malfunction

Category: Body
Severity: Body Warning Light
Applies to: Silverado, Sierra, Tahoe, Suburban, Impala, Malibu, Corvette, Escalade
Related: No single generic twin. See OBD Codes List

What it means

B101D. Electronic Control Unit Hardware Malfunction. This Chevy-enhanced code applies to Silverado, Sierra, Tahoe, Suburban, Impala, Malibu, Corvette, Escalade.

Findings, check these first

Internal hardware fault in the OnStar vehicle communication interface module (VCIM)
Extreme low-voltage or dead-battery event falsely setting B101D F0 in the BCM
Internal memory or checksum failure inside the electronic control unit
Water intrusion or corroded connector at the module

Standard procedure

Read the symptom byte with a Tech2 or GDS2 to identify the failing internal circuit
Clear the code first; if B101D F0 clears with no symptoms, do not replace the module
Check battery condition and charging system output before condemning any module
Inspect module connectors for moisture and corrosion
Replace the affected module only if the code resets as current with good voltage and wiring

Look up another code

Press / to jump to the box. Chevy-enhanced powertrain, body, chassis and network codes.

Sources and review

Review: no source links are recorded for this entry.

Last updated 2026-09-25.

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