What Does P1412 Mean?
The EGR differential pressure sensor voltage signal is below the acceptable threshold. This sensor monitors pressure changes across the EGR system to verify proper exhaust gas recirculation flow.
Common Causes
35%
Faulty EGR differential pressure sensor
30%
Damaged or corroded wiring/connector to EGR pressure sensor
20%
Clogged or restricted EGR passages or sensor ports
10%
ECM internal fault or poor ground connection
5%
Vacuum leak affecting EGR pressure readings
Diagnostic Steps
1
Step 1: Inspect EGR differential pressure sensor connector for corrosion, damage, or loose pins
2
Step 2: Test sensor voltage output with multimeter at idle and during EGR operation (typically 0.5-4.5V range)
3
Step 3: Check wiring continuity between sensor and ECM, verify ground circuit integrity
4
Step 4: Inspect EGR sensor ports and passages for carbon buildup or blockage, clean if necessary
5
Step 5: If all wiring and passages are intact, replace EGR differential pressure sensor
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The EGR differential pressure sensor voltage signal is below the acceptable threshold. This sensor monitors pressure changes across the EGR system to verify proper exhaust gas recirculation flow.
The most common cause of P1412 (EGR Different.Pressure Sensor Signal too Low) is: Faulty EGR differential pressure sensor
Typical repair costs for P1412 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Not immediately dangerous to drive, but may cause increased emissions, failed emissions testing, and reduced fuel economy.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1412 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control - EGR System
Difficulty
Type
Manufacturer
Recommended Tools
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