AutoCodes – Cadillac – B0168 Cadillac

B0168 Cadillac Code - Passenger Compartment Temperature Sensor 2 Circuit

Quick Answer

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the discharge air in the HVAC ducts. Common causes include Faulty Passenger Compartment Temperature Sensor 2, Passenger Compartment Temperature Sensor 2 harness is open or shorted, Passenger Compartment Temperature Sensor 2 circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B0168 Cadillac indicates Passenger Compartment Temperature Sensor 2 Circuit.
Common causes: Common causes include Faulty Passenger Compartment Temperature Sensor 2, Passenger Compartment Temperature Sensor 2 harness is open or shorted, Passenger Compartment Temperature Sensor 2 circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,546

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 10, 2021

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code B0168 Cadillac Description

Air temperature sensors allow the Heating, Ventilation, and Air Conditioning (HVAC) Control Module to monitor the temperature of the discharge air in the HVAC ducts. The module applies 5 volts to internal input resistors that are connected to the signal circuits of the air temperature sensors. The module provides ground to the air temperature sensors through the low reference circuit. The HVAC control module monitors the voltage drops across the air temperature sensors and uses the inputs for automatic control calculations. When the duct air temperatures are cold, the resistances of the sensors are high and the voltage signals are high. When the duct air temperatures are hot, the resistances of the sensors are low and the voltage signals are low. The HVAC control module converts the voltage values to count values where 1 volt is approximately equal to 51 counts.

OBDII Code B0168 Cadillac - Passenger Compartment Temperature Sensor 2 Circuit - AutoCodes.com — B0168 Cadillac Code - Passenger Compartment Temperature Sensor 2 Circuit

What does this mean?

What are the Possible Causes of the DTC B0168 Cadillac?

Faulty Passenger Compartment Temperature Sensor 2
Passenger Compartment Temperature Sensor 2 harness is open or shorted
Passenger Compartment Temperature Sensor 2 circuit poor electrical connection
Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How to Fix the DTC B0168 Cadillac?

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 does this mean?

Code Tech Notes

B0168 05: Passenger Compartment Temperature Sensor 2 Circuit Short to Battery or Open
B0168 02: Passenger Compartment Temperature Sensor 2 Circuit Short to Ground

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B0168 Cadillac 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 B0168 Cadillac code?

Need more information on how to fix the B0168 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B0168 Cadillac 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 B0168 Cadillac Code

1. What are the common symptoms of OBDII code B0168 in a Cadillac related to the Passenger Compartment Temperature Sensor 2 Circuit?

The common symptoms include inaccurate temperature readings on the climate control system, the air conditioning system not functioning properly, or the heater not producing hot air.

2. What could cause the OBDII code B0168 in a Cadillac to trigger?

The code B0168 typically triggers due to a malfunction in the Passenger Compartment Temperature Sensor 2 Circuit, which may be caused by a faulty sensor, wiring issues, or a problem with the climate control module.

3. How can I diagnose the issue related to OBDII code B0168 in my Cadillac?

Diagnosing the issue requires using a diagnostic scanner to retrieve the specific trouble code, inspecting the wiring and connections related to the Passenger Compartment Temperature Sensor 2, and testing the sensor's resistance and voltage output.

4. Can I drive my Cadillac with the OBDII code B0168 present?

While it may be possible to drive the vehicle with this code present, it is not recommended as it can lead to further issues with the climate control system and potentially affect the overall comfort inside the vehicle.

5. How can I repair the Passenger Compartment Temperature Sensor 2 Circuit issue in my Cadillac?

Repairing the issue may involve replacing the faulty temperature sensor, repairing any damaged wiring, or resetting the climate control system to clear the error code.

6. Are there any DIY tips for fixing the OBDII code B0168 in a Cadillac?

DIY tips include checking for loose connections, ensuring the sensor is clean and free of debris, and following the manufacturer's repair manual for specific troubleshooting steps.

7. Is it necessary to reset the error code after fixing the issue related to OBDII code B0168?

Yes, it is recommended to reset the error code using a diagnostic scanner after fixing the issue to ensure the system recognizes the repair and to prevent the code from reoccurring.

8. Can extreme temperatures or environmental conditions trigger the OBDII code B0168 in a Cadillac?

Extreme temperatures or environmental conditions can potentially affect the performance of the Passenger Compartment Temperature Sensor 2, leading to the triggering of the code B0168.

9. How can I prevent the OBDII code B0168 from occurring in my Cadillac in the future?

Regular maintenance of the climate control system, checking for any signs of wear or damage to the sensor and wiring, and addressing any issues promptly can help prevent the code B0168 from occurring in the future.

10. Is it necessary to visit a dealership or a mechanic to fix the OBDII code B0168 in a Cadillac?

While it's recommended to seek professional help for accurate diagnosis and repair, some simple fixes like sensor replacement or wiring repairs can be done at home if you have the necessary tools and knowledge.