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DTC B101D

DTC B101D

Diagnostic Instructions


Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptor

DTC B101D 00

Electronic Control Module Hardware

DTC B101D 04

Electronic Control Module - Hardware Open

DTC B101D 08

Electronic Control Module, Hardware Performance - Invalid Signal

DTC B101D 0F

Electronic Control Module, Hardware - Instable Signal

DTC B101D 12

Electronic Control Module, Hardware - Low Input Value

DTC B101D 13

Electronic Control Module, Hardware - Low Voltage/High Temperature

DTC B101D 14

Electronic Control Module, Hardware - High Voltage/Low Temperature

DTC B101D 1A

Electronic Control Module, Hardware Performance - Bias Level Out of Range

DTC B101D 2B

Electronic Control Module, Hardware - No Reference

DTC B101D 2C

Electronic Control Module, Hardware -

DTC B101D 31

Electronic Control Module, Hardware - Checksum Error

DTC B101D 32

Electronic Control Module, Hardware - General Memory Error

DTC B101D 34

Electronic Control Module, Hardware - RAM Malfunction

DTC B101D 35

Electronic Control Module, Hardware - ROM Malfunction

DTC B101D 36

Electronic Control Module, Hardware - EEPROM Performance/Malfunction

DTC B101D 37

Electronic Control Module, Hardware - Software Error

DTC B101D 38

Electronic Control Module, Hardware - Malfunction, Monitoring Software

DTC B101D 39

Electronic Control Module, Hardware - Internal Fault

DTC B101D 3A

Electronic Control Module, Hardware - Incorrect Component Installed

DTC B101D 3B

Electronic Control Module, Hardware - Malfunction, Self-Test

DTC B101D 3C

Electronic Control Module, Hardware - Internal Communication Error

DTC B101D 43

Electronic Control Module, Hardware - EEPROM Incorrectly Programmed

DTC B101D 73

Electronic Control Module, Hardware - Parity Error

DTC B101D F0

Electronic Control Module, Hardware

DTC B101D F1

Electronic Control Module, Hardware

Circuit/System Description

The internal fault detection is handled inside the control module. The symptom byte listed in the DTC Descriptor is for engineering reference only. No external circuit diagnosis is involved.

Conditions for Running the DTC


The control module runs the program to detect an internal fault when power up is commanded. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.

The keyless entry control module will generate this DTC with symptom byte 39 when the antenna for the keyless entry control module is activated.


Conditions for Setting the DTC

The control module has detected an internal fault.

Action Taken When the DTC Sets

The control module refuses all additional inputs.

Conditions for Clearing the DTC


A current DTC clears when the malfunction is no longer present.

A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.


Diagnostic Aids


This DTC may be stored as a history DTC without affecting the operation of the control module.

Do not replace a control module based only on DTC B101D being set in history with the exception of the following control modules:

- K36 Inflatable Restraint Sensing and Diagnostic Module (SDM)

- K85 Passenger Presence Detection Module

If DTC B101D is set as current, replace the appropriate control module.


Circuit/System Verification

Verify that DTC B101D is not set.

If the DTC was generated with symptom byte 43, program the control module that set the DTC. If the DTC recurs, replace the control module that triggered the DTC. If the DTC is generated with another symptom byte, replace the control module that set the DTC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for module replacement, setup, and programming