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P2145 OBD-II Trouble Code: Exhaust Gas Recirculation Ventilation Control Circuit High

Check Engine Light

P2145 Code Definition

A P2145 code is a generic powertrain code related to fuel and air metering and auxiliary emissions controls. This code is stating that the exhaust gas recirculation (EGR) vent control circuit is registering a high input voltage.

The P2145 code is related to:

  • P2143 Exhaust Gas Recirculation Vent Contol Circuit/Open
  • P2144 Exhaust Gas Recirculation Vent Control Circuit Low

What the P2145 Code Means

When a P2145 code appears, the ECM has found a problem in the rate of flow of the EGR system vent control circuit. The EGR valve system is most often controlled by an engine vacuum and is controlled by the engine control module (ECM). The ECM uses electrical solenoids to allow engine vacuum when open and restrict vacuum to the EGR valve when closed. The valve is opened and closed the needed amount with the use of electric motors via varying degrees of voltage.

The ECM monitors the output signal to the EGR control solenoid valve. If the valve voltage registers high, even if the EGR control solenoid valve is on, the ECM will determine a malfunction in the EGR control solenoid valve control system. If the change of manifold air pressure is not correct when the EGR valve is activated, a code will be stored.

What Causes the P2145 Code?

A P2145 code appears due to a number of reasons, including:

  • Damaged or defective EGR vent control solenoid
  • Clogged EGR passages
  • Clogged DPFE sensor passages
  • Damaged or defective EGR sensor
  • Damaged or defective MAP sensor
  • Broken or damaged vacuum line
  • Damaged or faulty electrical connections

What are the Symptoms of the P2145 Code?

Symptoms of a P2145 may include:

  • An illuminated warning or Check Engine Light

How Does a Mechanic Diagnose the P2145 Code?

A mechanic may use one or more of the following methods to diagnose a P2145 code:

  • Utilize an OBD-II scanner to check for a stored P2145 code

  • Visually inspect the vehicle for any damaged or frayed wiring or connectors and other components

  • Visually inspect all vacuum lines and hoses

  • Check for a sticking EGR valve

  • Test the vacuum line

  • Observe EGR operation for possible clogging

  • Test the EGR control solenoid connector for voltage and ground signals

  • Test the impacted circuit for continuity

Common Mistakes when Diagnosing the P2145 Code

Replacing the EGR valve when there may be other damaged or faulty components or wiring can result in expensive, unneeded repairs. Be sure to evaluate and check all possible components before replacing the valve.

How Serious is the P2145 Code?

Because no other symptoms may appear aside from an illuminated warning or Check Engine Light, YourMechanic does not consider this a serious code, it is recommended to have this issue diagnosed and repaired as soon as possible.

What Repairs can Fix the P2145 Code?

  • Repair or replace any damaged wiring, connectors, or components

  • Repair or replace any damaged or leaking vacuum lines or hoses

  • Using the OBD-II scanner in test-drive mode, monitor EGR function

  • Replace any damaged or defective control solenoids or sensors

  • Perform a carbon cleanse

  • Replace a damaged or defective EGR valve

  • Clear all codes, test drive the vehicle, and rescan to see if the code reappears

Need Help with a P2145 Code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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