AutoCodes – Generic – B1856

B1856 Code - Climate Control Air Temperature Internal Sensor Motor Circuit Short To Ground

Quick Answer

The Body Control Module (BCM) monitors the Climate Control Air Temperature Internal Sensor Motor. Common causes include Faulty Climate Control Air Temperature Internal Sensor Motor, Climate Control Air Temperature Internal Sensor Motor harness is open or shorted, Climate Control Air Temperature Internal Sensor Motor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: B1856 indicates Climate Control Air Temperature Internal Sensor Motor Circuit Short To Ground.
Common causes: Common causes include Faulty Climate Control Air Temperature Internal Sensor Motor, Climate Control Air Temperature Internal Sensor Motor harness is open or shorted, Climate Control Air Temperature Internal Sensor Motor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 5,975

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 07, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1856 Description

The Body Control Module (BCM) monitors the Climate Control Air Temperature Internal Sensor Motor. The BCM sets the OBDII code when the Climate Control Air Temperature Internal Sensor Motor is not to factory specifications.

OBDII Code B1856 - Climate Control Air Temperature Internal Sensor Motor Circuit Short To Ground - AutoCodes.com — B1856 Code - Climate Control Air Temperature Internal Sensor Motor Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B1856?

Faulty Climate Control Air Temperature Internal Sensor Motor
Climate Control Air Temperature Internal Sensor Motor harness is open or shorted
Climate Control Air Temperature Internal Sensor Motor circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC B1856?

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 B1856 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.

Need more information about the B1856 code?

Need more information on how to fix the B1856 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1856 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B1856 Lexus — Open In Rear Side Squib Left Circuit
B1856 Scion — Open In Rear Side Squib Left Circuit
B1856 Toyota — Open In Rear Side Squib Left Circuit

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.

Frequently Asked Questions about B1856 Code

What does the OBDII code B1856 mean?

The OBDII code B1856 indicates a problem with the climate control air temperature internal sensor motor circuit, specifically a short to ground, which means there is an unintended connection in the circuit that can disrupt proper functioning.

What are common symptoms of the B1856 code?

Common symptoms include inconsistent temperature control in the cabin, the climate control system not responding correctly, and the climate control warning light illuminating on the dashboard.

What could cause the B1856 code to trigger?

The B1856 code can be triggered by issues such as a faulty internal sensor, damaged wiring or connectors, or a malfunctioning climate control module that causes a short circuit.

How can I diagnose the B1856 code?

To diagnose the B1856 code, start by visually inspecting the wiring and connectors for damage. Then, use a multimeter to check for continuity and proper voltage in the sensor circuit. Finally, test the sensor itself to ensure it is functioning correctly.

What are some common repair solutions for the B1856 code?

Repair solutions may include replacing the faulty internal sensor, repairing damaged wiring or connectors, or replacing the climate control module if it is determined to be malfunctioning.

Can I drive my vehicle with the B1856 code?

While you can technically drive your vehicle, it is not advisable as the climate control system may not function properly, which could lead to discomfort and safety issues in extreme weather conditions.

How much does it typically cost to fix the B1856 code?

Repair costs can vary widely depending on the specific issue and labor rates, but it generally ranges from $100 to $500, depending on whether you need to replace a sensor, repair wiring, or replace the climate control module.

Will clearing the code B1856 fix the problem?

Clearing the code may temporarily turn off the warning light, but it will not fix the underlying issue. The code will likely return if the problem is not resolved.

Can a faulty battery cause the B1856 code?

Yes, a weak or failing battery can cause electrical issues that may trigger various codes, including B1856. It is advisable to check the battery condition as part of the diagnostic process.