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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 XX

ECU 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 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.

Conditions for Setting the DTC

The module has detected an internal malfunction.

Action Taken When the DTC Sets

The 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

- K10 Coolant Heater Control Module

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


Circuit/System Verification

Verify that DTC B101D is not set.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for module replacement, setup, and programming