AutoCodes – Generic – P0548

P0548 Code - Exhaust Gas Temperature Sensor Circuit Low Bank 2 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 2 Sensor 1, Exhaust Gas Temperature Sensor Bank 2 Sensor 1 harness is open or shorted, Exhaust Gas Temperature Sensor Bank 2 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: P0548 indicates Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1.
Common causes: Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) Bank 2 Sensor 1, Exhaust Gas Temperature Sensor Bank 2 Sensor 1 harness is open or shorted, Exhaust Gas Temperature Sensor Bank 2 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 7,178

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 P0548 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 P0548 OBDII code when the Exhaust Gas Temperature Sensor is out of factory specifications.

OBDII Code P0548 - Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1 - AutoCodes.com — P0548 Code - Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0548?

Faulty Exhaust Gas Temperature Sensor (EGTS) Bank 2 Sensor 1
Exhaust Gas Temperature Sensor Bank 2 Sensor 1 harness is open or shorted
Exhaust Gas Temperature Sensor Bank 2 Sensor 1 circuit poor electrical connection
Exhaust leaks
Excessive particulate matter buildup on sensor

How to Fix the DTC P0548?

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 P0548 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 P0548 code?

Need more information on how to fix the P0548 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0548 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P0548 Chevrolet — Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1
P0548 Dodge — Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1
P0548 Ford — Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1
P0548 GMC — Exhaust Gas Temperature Sensor Circuit Low Bank 2 Sensor 1

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 P0548 Code

1. What are the common symptoms of OBDII code P0548?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What does the OBDII code P0548 indicate?

- The code P0548 indicates a low circuit voltage in the exhaust gas temperature sensor for bank 2 sensor 1.

3. What are the possible causes of OBDII code P0548?

- Possible causes include a faulty exhaust gas temperature sensor, damaged wiring or connectors, a malfunctioning ECM, or a problem with the exhaust system.

4. How can I diagnose the issue related to OBDII code P0548?

- Diagnosis involves using a scan tool to read the code, checking the wiring and connectors for damage, testing the sensor's resistance, and verifying proper voltage signals.

5. Can I drive my vehicle with OBDII code P0548?

- It is not recommended to drive your vehicle with this code as it can lead to further damage and potential safety hazards.

6. How can I repair OBDII code P0548?

- Repairing the issue involves replacing the faulty exhaust gas temperature sensor, repairing or replacing damaged wiring or connectors, and resetting the fault codes.

7. Is it necessary to reset the ECM after repairing OBDII code P0548?

- Yes, it is recommended to reset the ECM after repairing the issue to clear the fault code and ensure proper operation of the vehicle.

8. What are the long-term effects of ignoring OBDII code P0548?

- Ignoring this code can lead to poor engine performance, increased emissions, and potential damage to other components in the exhaust system.

9. Can a DIY enthusiast fix OBDII code P0548?

- Depending on the skill level and tools available, a DIY enthusiast may be able to fix this issue, but it is recommended to consult a professional mechanic for accurate diagnosis and repair.

10. How much does it typically cost to repair OBDII code P0548?

- The cost of repairing OBDII code P0548 can vary depending on the cause of the issue, but it typically ranges from $150 to $400 including parts and labor.