AutoCodes – Generic – B1849

B1849 Code - Climate Control Temperature Differential Circuit Failure

Quick Answer

The Body Control Module (BCM) monitors the Climate Control Temperature Differential. Common causes include Faulty Climate Control Temperature Sensor, Climate Control Temperature Sensor harness is open or shorted, Climate Control Temperature Sensor 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: B1849 indicates Climate Control Temperature Differential Circuit Failure.
Common causes: Common causes include Faulty Climate Control Temperature Sensor, Climate Control Temperature Sensor harness is open or shorted, Climate Control Temperature Sensor 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 5,922

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 B1849 Description

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

OBDII Code B1849 - Climate Control Temperature Differential Circuit Failure - AutoCodes.com — B1849 Code - Climate Control Temperature Differential Circuit Failure

What does this mean?

What are the Possible Causes of the DTC B1849?

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

How to Fix the DTC B1849?

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 B1849 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 B1849 code?

Need more information on how to fix the B1849 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1849 code diagnosed by a professional: Find a repair shop in your area

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 B1849 Code

1. What are common symptoms of OBDII code B1849 (Climate Control Temperature Differential Circuit Failure)?

Symptoms may include inconsistent temperature readings on the climate control display, unresponsive temperature adjustments, or the climate control system not functioning correctly.

2. What are possible causes of OBDII code B1849?

Potential causes of this code can be a faulty temperature sensor, damaged wiring or connectors in the temperature control circuit, or a malfunctioning climate control module.

3. How can I diagnose the issue related to OBDII code B1849?

Diagnosis typically involves using a scan tool to retrieve the code and then inspecting the temperature sensor, circuit connections, and climate control module for any visible damage or irregularities.

4. Can OBDII code B1849 be fixed at home?

Depending on your level of expertise, you may be able to fix this issue at home by replacing the faulty temperature sensor, repairing damaged wiring, or resetting the climate control system. However, it is recommended to consult a professional if you are unsure.

5. Are there any tips for repairing OBDII code B1849?

Before replacing any components, it's advisable to carefully inspect the wiring and connectors for any signs of damage or corrosion. Additionally, following the manufacturer's diagnostic procedures can help pinpoint the exact cause of the issue.

6. Will OBDII code B1849 cause any long-term damage to my vehicle?

While this code may not directly cause immediate harm to your vehicle, a malfunctioning climate control system can impact your comfort and convenience while driving. It's best to address the issue promptly to avoid any potential consequences.

7. How much does it typically cost to repair OBDII code B1849?

The cost of repairing this code can vary depending on the specific cause of the issue, the labor rates in your area, and the price of replacement parts. It's recommended to obtain quotes from different mechanics or repair shops.

8. Can OBDII code B1849 trigger the check engine light?

Yes, OBDII code B1849 can trigger the check engine light or a climate control system warning light on your dashboard. It's important not to ignore these warnings and address the issue promptly.

9. Is it safe to drive with OBDII code B1849?

While it may be safe to drive with this code in the short term, a malfunctioning climate control system can affect your driving comfort and potentially lead to other issues. It's best to have the problem diagnosed and repaired as soon as possible.

10. How can I prevent OBDII code B1849 from recurring?

Regularly maintaining your vehicle, including checking the climate control system for any signs of issues, can help prevent the recurrence of this code. Following the manufacturer's recommended service intervals can also help keep your vehicle in optimal condition.