AutoCodes – GMC – B1543 GMC

B1543 GMC Code - Oil Temperature Circuit Open

Quick Answer

The Instrument Panel Cluster (IPC) supplies a 5-volt reference signal to Oil Temperature Sensor. Common causes include Faulty Oil Temperature Sensor, Oil Temperature Sensor harness is open or shorted, Oil 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: B1543 GMC indicates Oil Temperature Circuit Open.
Common causes: Common causes include Faulty Oil Temperature Sensor, Oil Temperature Sensor harness is open or shorted, Oil 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 728

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 May 02, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B1543 GMC Description

The Instrument Panel Cluster (IPC) supplies a 5-volt reference signal to Oil Temperature Sensor. When engine oil is cold, sensor resistance will decrease, and IPC reference voltage level will drop. IPC measures reference voltage change and displays the calculated value on the oil pressure gauge.

OBDII Code B1543 GMC - Oil Temperature Circuit Open - AutoCodes.com — B1543 GMC Code - Oil Temperature Circuit Open

What does this mean?

What are the Possible Causes of the DTC B1543 GMC?

Faulty Oil Temperature Sensor
Oil Temperature Sensor harness is open or shorted
Oil Temperature Sensor circuit poor electrical connection
Faulty Instrument Panel Cluster (IPC)

How to Fix the DTC B1543 GMC?

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 B1543 GMC 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 B1543 GMC code?

Need more information on how to fix the B1543 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B1543 GMC 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 B1543 GMC Code

1. What are the common symptoms of OBDII code B1543 GMC (Oil Temperature Circuit Open)?

The common symptoms of this code may include an illuminated check engine light on the dashboard, inaccurate oil temperature readings on the gauge cluster, and potential issues with engine performance.

2. What can cause the OBDII code B1543 GMC to trigger?

This code is typically triggered by an open circuit in the oil temperature sensor or its wiring. It can be caused by a damaged sensor, corroded connectors, or wiring issues.

3. How can I diagnose the cause of OBDII code B1543 GMC?

Diagnosing this code usually involves checking the oil temperature sensor and its wiring for any signs of damage, corrosion, or poor connections. Using a multimeter to test the sensor's resistance can help identify the issue.

4. Can OBDII code B1543 GMC cause any long-term damage to the vehicle?

While the code itself may not cause immediate damage, ignoring it can lead to potential issues with monitoring the oil temperature accurately, which can impact engine performance and longevity.

5. What are some repair tips for fixing OBDII code B1543 GMC?

Repairing this code typically involves replacing the faulty oil temperature sensor or repairing/replacing damaged wiring or connectors. Ensuring proper installation and connection is crucial to resolving the issue.

6. Is it safe to continue driving with OBDII code B1543 GMC active?

It is generally not recommended to drive with the code active, as it can affect the engine's performance and potentially lead to other issues. It's best to address the underlying problem as soon as possible.

7. Can resetting the OBDII system clear the B1543 GMC code?

Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not fixed, the code is likely to return. It's important to diagnose and repair the root cause of the problem.

8. How much does it typically cost to repair OBDII code B1543 GMC at a mechanic?

The cost of repairing this code can vary depending on the labor rates and parts costs in your area. It's recommended to get a few quotes from different mechanics to find the best price.

9. Are there any preventive measures to avoid OBDII code B1543 GMC in the future?

Regularly inspecting and maintaining the oil temperature sensor and its wiring can help prevent issues that may trigger this code. Following the manufacturer's recommended maintenance schedule is also key to avoiding such problems.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code B1543 GMC?

Depending on the individual's skills and tools available, some DIY enthusiasts may be able to diagnose and repair this code. However, if in doubt, it's best to consult a professional mechanic for proper diagnosis and repair.