Engine-Codes.com
Engine-Codes – Generic – P045C

P045C Code - Exhaust Gas Recirculation 'B' Control Circuit Low

Quick Answer

The P045C diagnostic trouble code (DTC) indicates that there is a low voltage condition in the exhaust gas recirculation (EGR) 'B' control circuit. Common causes include Faulty EGR valve, Wiring or connector issues in the EGR 'B' control circuit, EGR temperature sensor malfunction. 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
P045C indicates Exhaust Gas Recirculation 'B' Control Circuit Low.
Common causes
Common causes include Faulty EGR valve, Wiring or connector issues in the EGR 'B' control circuit, EGR temperature sensor malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P045C Description

The P045C diagnostic trouble code (DTC) indicates that there is a low voltage condition in the exhaust gas recirculation (EGR) 'B' control circuit. The EGR system is responsible for reducing nitrogen oxide emissions by recirculating a portion of the exhaust gases back into the intake manifold. The EGR valve controls the flow of exhaust gases into the intake system, and the 'B' control circuit is a specific part of the EGR system that regulates the EGR valve's operation.

OBDII Code P045C - Exhaust Gas Recirculation 'B' Control Circuit Low
P045C Code - Exhaust Gas Recirculation 'B' Control Circuit Low

Common Causes of P045C

  1. Faulty EGR valve
  2. Wiring or connector issues in the EGR 'B' control circuit
  3. EGR temperature sensor malfunction
  4. Carbon buildup in the EGR system
  5. PCM (Powertrain Control Module) failure

Symptoms of P045C

  1. Rough idle or stalling
  2. Decreased fuel efficiency
  3. Check engine light illuminated
  4. Failed emissions test
  5. Engine hesitation or lack of power

How to Fix P045C

  1. Use a scan tool to verify the P045C code and diagnose the specific cause of the issue.
  2. Inspect the EGR valve, wiring, and connectors for any signs of damage or corrosion.
  3. Test the EGR temperature sensor to ensure it is functioning correctly.
  4. Clean or replace the EGR valve if necessary.
  5. Clear the DTC and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P045C

The cost of repairing a P045C DTC can vary depending on the specific cause of the issue and the labor rates in your area. In general, the cost of parts for this repair can range from $100 to $300, with labor costs adding an additional $100 to $200. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

Need more information about the P045C code?

Need more information on how to fix the P045C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P045C 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 P045C Code

No Frequently Asked Questions about P045C Code found.

Discuss the causes and fixes for P045C OBDII Code

Submit a New Comment

Code P045C comments

No comments found for this page.