AutoCodes – Generic – P245B

P245B Code - Exhaust Gas Recirculation Cooler Bypass Control Circuit Range/Performance

Quick Answer

The Exhaust Gas Recirculation (EGR) Cooler bypass valve is used to bypass the EGR cooler when the engine is in an active regeneration mode. Common causes include Coolant System, EGR Cooler, Faulty Exhaust Gas Recirculation (EGR) Temperature Sensor. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P245B indicates Exhaust Gas Recirculation Cooler Bypass Control Circuit Range/Performance.
Common causes: Common causes include Coolant System, EGR Cooler, Faulty Exhaust Gas Recirculation (EGR) Temperature Sensor.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 25,470

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 15, 2019

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

The Exhaust Gas Recirculation (EGR) Cooler bypass valve is used to bypass the EGR cooler when the engine is in an active regeneration mode. This is to prevent EGR cooler fouling. There are two portions to this diagnostic. At key on the Engine Control Module (ECM) drives the control line low and then high and monitors the correct status response. Throughout engine operation looks for status response voltage to be within 5-8 volts. The EGR Cooler Bypass valve will send a signal between 1.0 and 1.7 volts. When this occurs the ECM logs a fault. The second portion of this diagnostic monitors Exhaust Gas Recirculation temperature. If the EGR Cooler Bypass valve was in bypass mode incorrectly, the exhaust gas recirculation temperatures would exceed a temperature limit; this condition will also trigger the fault. The ECM will light a MIL lamp immediately after this diagnostic runs and fails. The ECM will turn off the MIL lamp after the diagnostic passes in four consecutive drive cycles.

OBDII Code P245B - Exhaust Gas Recirculation Cooler Bypass Control Circuit Range/Performance - AutoCodes.com — P245B Code - Exhaust Gas Recirculation Cooler Bypass Control Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P245B?

Coolant System
EGR Cooler
Faulty Exhaust Gas Recirculation (EGR) Temperature Sensor
Exhaust Gas Recirculation (EGR) Temperature Sensor harness is open or shorted
Exhaust Gas Recirculation (EGR) Temperature Sensor circuit poor electrical connection

How to Fix the DTC P245B?

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 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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Information for Specific Makes

P245B Buick — Exhaust Gas Recirculation Cooler Bypass Valve Performance
P245B Cadillac — Exhaust Gas Recirculation Cooler Bypass Valve Performance
P245B Chevrolet — Exhaust Gas Recirculation Cooler Bypass Valve Performance
P245B Dodge — Exhaust Gas Recirculation Cooler Bypass Control Circuit Range/Performance
P245B GMC — Exhaust Gas Recirculation Cooler Bypass Valve Performance

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.