AutoCodes – Dodge – P2478 Dodge

P2478 Dodge Code - Exhaust Gas Temperature Out of Range Bank 1 Sensor 1

Quick Answer

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out of range high values. Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) Bank 1 Sensor 1, Exhaust Gas Temperature Sensor Bank 1 Sensor 1 harness is open or shorted, Exhaust Gas Temperature Sensor Bank 1 Sensor 1 circuit poor electrical connection. 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: P2478 Dodge indicates Exhaust Gas Temperature Out of Range Bank 1 Sensor 1.
Common causes: Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) Bank 1 Sensor 1, Exhaust Gas Temperature Sensor Bank 1 Sensor 1 harness is open or shorted, Exhaust Gas Temperature Sensor Bank 1 Sensor 1 circuit poor electrical connection.
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 1,429

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
FAQs
Comments
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Code P2478 Dodge Description

The Powertrain Control Module (PCM) continuously monitors the Exhaust Gas Temperature Sensor (EGTS) for proper circuit continuity and out of range high values. The EGTS is located in front of the Diesel Oxidation Catalyst (DOC) and/or in front of the Diesel Particulate Filter (DPF). The EGTS detects exhaust gas temperature and converts it into a voltage and feeds back to the PCM with the voltage signal in order to control engine conditions to effectively reduce emissions. The PCM sets the P2478 OBDII code when the Exhaust Gas Temperature Sensor is out of factory specifications.

OBDII Code P2478 Dodge - Exhaust Gas Temperature Out of Range Bank 1 Sensor 1 - AutoCodes.com — P2478 Dodge Code - Exhaust Gas Temperature Out of Range Bank 1 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P2478 Dodge?

Faulty Exhaust Gas Temperature Sensor (EGTS) Bank 1 Sensor 1
Exhaust Gas Temperature Sensor Bank 1 Sensor 1 harness is open or shorted
Exhaust Gas Temperature Sensor Bank 1 Sensor 1 circuit poor electrical connection
Exhaust leaks
Excessive particulate matter buildup on sensor

How to Fix the DTC P2478 Dodge?

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 P2478 Dodge 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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Need Help with the Code?

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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 P2478 Dodge Code

1. What does the OBDII code P2478 mean on a Dodge?

P2478 indicates that the exhaust gas temperature (EGT) sensor 1 on bank 1 is reporting a temperature reading that is out of the expected range.

2. What are the common symptoms of a P2478 code on a Dodge?

Symptoms may include an illuminated check engine light, reduced fuel efficiency, potential limp mode activation, and poor engine performance.

3. What causes the P2478 code on a Dodge vehicle?

Common causes include a faulty exhaust gas temperature sensor, damaged wiring or connectors, an exhaust system leak, or a malfunctioning PCM (powertrain control module).

4. Can I drive my Dodge with a P2478 code?

Driving with a P2478 code is not recommended, as it may lead to reduced engine efficiency, potential exhaust system damage, or triggering of limp mode.

5. How do I diagnose a P2478 code on a Dodge?

Diagnosis involves inspecting the EGT sensor, checking for damaged wiring or connectors, testing the sensor with a multimeter, and scanning the PCM for additional codes.

6. How do I fix a P2478 code on a Dodge?

Repairs may include replacing the faulty EGT sensor, repairing or replacing damaged wiring or connectors, fixing exhaust leaks, or reprogramming the PCM if necessary.

7. Where is Bank 1 Sensor 1 located for the P2478 code on a Dodge?

Bank 1 Sensor 1 is typically the exhaust gas temperature sensor located upstream on the side of the engine with cylinder 1.

8. How much does it cost to fix the P2478 code on a Dodge?

Repair costs can range from $100 to $400, depending on whether the EGT sensor needs replacement or if additional repairs are required.

9. Can a faulty PCM cause the P2478 code on a Dodge?

Yes, a malfunctioning PCM can misinterpret exhaust temperature readings and trigger the P2478 code, though this is less common.

10. How can I prevent the P2478 code from occurring again on my Dodge?

Regular maintenance, ensuring the exhaust system is leak-free, and promptly addressing any sensor-related issues can help prevent the code from recurring.