AutoCodes – GMC – P245B GMC

P245B GMC Code - Exhaust Gas Recirculation Cooler Bypass Valve Performance

Quick Answer

The Engine Control Module (ECM) uses the Exhaust Gas Recirculation (EGR) bypass valve position sensor to determine the position of the bypass valve. Common causes include Faulty Exhaust Gas Recirculation Cooler Bypass Valve, Exhaust Gas Recirculation Cooler Bypass Valve harness is open or shorted, Exhaust Gas Recirculation Cooler Bypass Valve 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: P245B GMC indicates Exhaust Gas Recirculation Cooler Bypass Valve Performance.
Common causes: Common causes include Faulty Exhaust Gas Recirculation Cooler Bypass Valve, Exhaust Gas Recirculation Cooler Bypass Valve harness is open or shorted, Exhaust Gas Recirculation Cooler Bypass Valve 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 891

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 29, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P245B GMC Description

The Engine Control Module (ECM) uses the Exhaust Gas Recirculation (EGR) bypass valve position sensor to determine the position of the bypass valve. The ECM sends a reference voltage through the 5-volt reference circuit to the position sensor. The ECM provides a voltage return path for the sensor through the low reference circuit. A variable voltage signal, based on the valve position, is sent from the sensor to the ECM through the position sensor signal circuit. The ECM compares the actual bypass valve position with the desired bypass valve position when the valve is commanded open or closed. The EGR cooler bypass valve is controlled by the ECM through the bypass valve motor high control and the low control circuits. The ECM will pulse width modulate the low control circuit to ground when EGR cooler bypass is desired. The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the EGR cooler bypass valve is mechanically stuck.

OBDII Code P245B GMC - Exhaust Gas Recirculation Cooler Bypass Valve Performance - AutoCodes.com — P245B GMC Code - Exhaust Gas Recirculation Cooler Bypass Valve Performance

What does this mean?

What are the Possible Causes of the DTC P245B GMC?

Faulty Exhaust Gas Recirculation Cooler Bypass Valve
Exhaust Gas Recirculation Cooler Bypass Valve harness is open or shorted
Exhaust Gas Recirculation Cooler Bypass Valve circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P245B 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 P245B 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.

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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 P245B GMC Code

1. What are the common symptoms of OBDII code P245B GMC?

The common symptoms of code P245B GMC include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine Light.

2. What can cause the OBDII code P245B GMC to trigger?

The OBDII code P245B GMC is typically triggered by a malfunction in the Exhaust Gas Recirculation (EGR) Cooler Bypass Valve, which may be caused by issues such as a faulty valve, wiring problems, or a clogged EGR system.

3. How serious is OBDII code P245B GMC?

Code P245B GMC should be addressed promptly to prevent potential damage to the engine and ensure optimal vehicle performance. Ignoring this code may lead to increased emissions, reduced fuel efficiency, and engine misfires.

4. How can I diagnose the OBDII code P245B GMC?

Diagnosing code P245B GMC involves using a scan tool to retrieve the code and examining the EGR Cooler Bypass Valve, related wiring, and EGR system for any visible damage or blockages. A professional diagnostic scan may be necessary for an accurate assessment.

5. Can I still drive my vehicle with OBDII code P245B GMC?

It is not recommended to drive your vehicle with an active P245B GMC code, as it can lead to further engine damage and performance issues. It is best to have the issue diagnosed and repaired before resuming normal driving.

6. How much does it typically cost to repair OBDII code P245B GMC?

The cost of repairing code P245B GMC can vary depending on the underlying cause of the issue, the extent of the repairs needed, and labor rates in your area. It is advisable to obtain quotes from reputable mechanics or dealerships.

7. Are there any DIY repair tips for OBDII code P245B GMC?

While some simple tasks like checking for loose connections or cleaning the EGR system may be DIY-friendly, diagnosing and repairing code P245B GMC often requires specialized tools and expertise. It is recommended to consult a professional mechanic for proper diagnosis and repair.

8. How long does it take to repair OBDII code P245B GMC?

The repair time for code P245B GMC can vary depending on the specific issue causing the code and the availability of parts. In some cases, repairs can be completed within a few hours, while more complex issues may require additional time.

9. Can a clogged EGR system cause OBDII code P245B GMC?

Yes, a clogged EGR system can contribute to triggering code P245B GMC, as it may affect the proper operation of the EGR Cooler Bypass Valve and lead to performance issues. Regular maintenance of the EGR system can help prevent such issues.

10. Will resetting the Check Engine Light resolve OBDII code P245B GMC?

Simply resetting the Check Engine Light without addressing the underlying issue causing code P245B GMC will not solve the problem. It is crucial to diagnose the root cause of the code and perform the necessary repairs to prevent its recurrence.