AutoCodes – Generic – B2429

B2429 Code - A/C Post Heater Sensor #2 Circuit Short to Ground

Quick Answer

The Body Control Module (BCM) monitors the A/C Post Heater Sensor #2. Common causes include Faulty A/C Post Heater Sensor #2, A/C Post Heater Sensor #2 harness is open or shorted, A/C Post Heater Sensor #2 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: B2429 indicates A/C Post Heater Sensor #2 Circuit Short to Ground.
Common causes: Common causes include Faulty A/C Post Heater Sensor #2, A/C Post Heater Sensor #2 harness is open or shorted, A/C Post Heater Sensor #2 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 3,852

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 Dec 08, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2429 Description

The Body Control Module (BCM) monitors the A/C Post Heater Sensor #2. The BCM sets the OBDII code when the A/C Post Heater Sensor #2 is not to factory specifications.

OBDII Code B2429 - A/C Post Heater Sensor #2 Circuit Short to Ground - AutoCodes.com — B2429 Code - A/C Post Heater Sensor #2 Circuit Short to Ground

What does this mean?

What are the Possible Causes of the DTC B2429?

Faulty A/C Post Heater Sensor #2
A/C Post Heater Sensor #2 harness is open or shorted
A/C Post Heater Sensor #2 circuit poor electrical connection

How to Fix the DTC B2429?

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 B2429 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 B2429 code?

Need more information on how to fix the B2429 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2429 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2429 Lexus — Steering Wheel Position Undecided
B2429 Toyota — Steering Wheel Position Undecided

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 B2429 Code

1. What are the common symptoms of OBDII code B2429 (A/C Post Heater Sensor #2 Circuit Short to Ground)?

The common symptoms include a malfunctioning air conditioning system, reduced heating performance, and potential issues with the post heater sensor #2.

2. What can cause OBDII code B2429 to trigger?

This code can be triggered by a short circuit to ground in the A/C post heater sensor #2 circuit, which disrupts the proper functioning of the sensor.

3. How serious is OBDII code B2429?

While this code may not cause immediate danger, it can lead to discomfort due to air conditioning and heating issues. It is recommended to address the problem promptly.

4. How can I diagnose the cause of OBDII code B2429?

Diagnosing the cause involves checking the wiring and connections related to the A/C post heater sensor #2 for any signs of damage or short circuits, using a multimeter to test for continuity, and inspecting the sensor itself.

5. Can I repair OBDII code B2429 myself?

If you have the necessary tools, skills, and knowledge, you may be able to repair this code yourself by fixing the short circuit in the A/C post heater sensor #2 circuit or replacing the sensor if needed.

6. Is it safe to continue driving with OBDII code B2429 present?

While it may be possible to drive with this code present, it is not advisable as it can lead to further damage to the air conditioning and heating systems. It is best to address the issue as soon as possible.

7. What are some tips for preventing OBDII code B2429 from occurring?

Regularly inspecting the wiring and connections related to the A/C post heater sensor #2, following proper maintenance schedules, and addressing any issues promptly can help prevent this code from occurring.

8. How much does it typically cost to repair OBDII code B2429?

The cost of repair can vary depending on the extent of the damage and whether you choose to repair it yourself or seek professional help. It is advisable to obtain quotes from automotive professionals for an accurate estimate.

9. Can OBDII code B2429 affect fuel efficiency?

While this code directly relates to the air conditioning and heating systems, it can indirectly impact fuel efficiency if left unresolved due to the added strain on the vehicle's systems.

10. Will resetting the OBDII system clear code B2429?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue causing code B2429 is not addressed, the code is likely to reappear. It is essential to diagnose and repair the root cause of the problem.