AutoCodes – Generic – B0790:01

B0790:01 Code - Transfer Case Neutral Indicator Circuit

Quick Answer

The Neutral indicator circuit consists of a Light Emitting Diode (LED) feed circuit, an LED, and an LED control circuit. Common causes include Faulty Transfer Case Select Switch, Transfer Case Select Switch harness is open or shorted, Transfer Case Select Switch circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: B0790:01 indicates Transfer Case Neutral Indicator Circuit.
Common causes: Common causes include Faulty Transfer Case Select Switch, Transfer Case Select Switch harness is open or shorted, Transfer Case Select Switch circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 550

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 18, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code B0790:01 Description

The Neutral indicator circuit consists of a Light Emitting Diode (LED) feed circuit, an LED, and an LED control circuit. The Ignition 1 voltage circuit is the LED feed circuit and continuously supplies B+ to the Neutral LED. When the Neutral mode has been selected by the driver, the Transfer Case Shift Control Module (TCCM) provides a ground through the Neutral indicator control circuit illuminating the LED.
The TCCM tests the Neutral indicator circuit for unexpected voltage by monitoring the B+ supplied by the BCM on the Ignition 1 voltage circuit by grounding the Neutral indicator control circuit for 2 seconds during the Bulb Test at key ON.
The Diagnostic Trouble Code (DTC) will be set when the TCCM detects 3.4 V or greater on the Neutral indicator control circuit when the Neutral indicator is commanded ON.

OBDII Code B0790:01 - Transfer Case Neutral Indicator Circuit - AutoCodes.com — B0790:01 Code - Transfer Case Neutral Indicator Circuit

What does this mean?

What are the Possible Causes of the DTC B0790:01?

Faulty Transfer Case Select Switch
Transfer Case Select Switch harness is open or shorted
Transfer Case Select Switch circuit poor electrical connection
Faulty Transfer Case Shift Control Module (TCCM)

How to Fix the DTC B0790:01?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0790:01 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.