What is P1406 : Engine Error code Causes Explained
This Guide covers the P1406 engine trouble code, its causes, symptoms, and solutions. Understanding this issue can help you maintain your vehicle’s performance and avoid costly EGR valve system repairs.
How to Identify a DTCs Number
The Diagnostic Trouble Code (DTC) P1406 refers to an issue with the Exhaust Gas Recirculation (EGR) valve position sensor circuit.
Understand, this trouble codes (DTCs) are 5 characters: 1 letter, 4 numbers. P-Powertrain indicates the fault code’s location. Generic or manufacturer-specific codes are indicated by the first digit. The second digit denotes the subsystem (7=transmission). The last two numbers describe the issue.
To identify a DTC number like P1406, you need an OBD-II scanner. By connecting the scanner to the vehicle’s OBD-II port, typically located under the dashboard, the scanner will display the error codes stored in the engine control module (ECM).
Causes of P1406 Error Code:
- Faulty EGR valve:
This is the most common cause, including issues like a stuck EGR valve, worn-out internal components, or a faulty actuator motor within the valve itself. - EGR position sensor malfunction:
The sensor responsible for monitoring the EGR valve position could be faulty, experiencing issues like incorrect readings or a broken connection. - EGR valve circuit problems:
Damaged wiring, loose connectors, or high resistance within the
electrical circuit leading to the EGR valve can trigger the code. - EGR tube issues:
Clogged or damaged EGR tubes can restrict exhaust gas flow, impacting the EGR valve operation. - Vacuum leaks:
Leaks in the vacuum lines connected to the EGR system can cause improper valve operation.
Risk Level of P1406 Error Code:
This high-risk alert is issued to warn the driver that continued operation without addressing the issue could lead to further engine damage. To resolve the issue, it’s recommended to inspect the EGR valve and sensor for clogs or damage and replace faulty components.
Common Car Brands Affected by P1406 Code:
The P1406 engine error code is commonly found in the following list.
- Chevrolet
- Cadillac
- Pontiac
- GMC
- Buick
Video: P1406 Engine Error code
FAQ’s
What is P1406 Engine Error Code?
The P1406 error code indicates a malfunction in the Exhaust Gas Recirculation (EGR) system, specifically with the EGR sensor or valve, impacting exhaust flow.
What Causes the P1406 Error Code?
Common causes include a faulty EGR valve, wiring issues, clogged passages, or a malfunctioning EGR sensor, all leading to improper exhaust recirculation.
What is the Risk Level of the P1406 Code?
The P1406 error code poses a high risk as it can reduce engine efficiency, increase emissions, and lead to further engine damage if left unaddressed.
Which Vehicles are Affected by P1406?
Vehicles with EGR systems, particularly older models from manufacturers like Chevrolet, Cadillac, Pontiac, GMC and Buick are most commonly affected by the P1406 engine code.