AutoCodes – Generic – P1428

P1428 Code - EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible

Quick Answer

The Exhaust Gas Recirculation (EGR) Temperature Sensors are variable resistors that measure the temperature of the exhaust gas at the inlet and outlet of the EGR cooler. Common causes include Faulty Exhaust Gas Recirculation (EGR) Temperature Sensor 1, Exhaust Gas Recirculation Temperature Sensor 1 harness is open or shorted, Exhaust Gas Recirculation Temperature Sensor 1 circuit poor electrical connection. 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: P1428 indicates EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible.
Common causes: Common causes include Faulty Exhaust Gas Recirculation (EGR) Temperature Sensor 1, Exhaust Gas Recirculation Temperature Sensor 1 harness is open or shorted, Exhaust Gas Recirculation Temperature Sensor 1 circuit poor electrical connection.
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.

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Code Popularity 21,599

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 25, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1428 Description

The Exhaust Gas Recirculation (EGR) Temperature Sensors are variable resistors that measure the temperature of the exhaust gas at the inlet and outlet of the EGR cooler. The Engine Control Module (ECM) supplies 5 volts to the EGR temperature sensor signal circuit and a ground for the low reference circuit. When the EGR temperature sensor is cold, the sensor resistance is high. When the EGR temperature increases, the sensor resistance decreases. With high sensor resistance, the ECM detects a higher voltage on the EGR temperature signal circuit. With lower sensor resistance, the ECM detects a lower voltage on the EGR temperature signal circuit.
The Diagnostic Trouble Code (DTC) will be set if the ECM detects that the EGR cooler temperature sensor 1 or 2 is greater than 20°C (36°F) different from Intake Air Temperature (IAT) sensor 2.

OBDII Code P1428 - EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible - AutoCodes.com — P1428 Code - EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible

What does this mean?

What are the Possible Causes of the DTC P1428?

Faulty Exhaust Gas Recirculation (EGR) Temperature Sensor 1
Exhaust Gas Recirculation Temperature Sensor 1 harness is open or shorted
Exhaust Gas Recirculation Temperature Sensor 1 circuit poor electrical connection

How to Fix the DTC P1428?

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 P1428 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.

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Information for Specific Makes

P1428 Audi — Brake System Vacuum Pump Activation Short To Ground
P1428 Buick — EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible
P1428 Cadillac — EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible
P1428 Chevrolet — EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible
P1428 GMC — EGR Temperature Sensor 1 Intake Air Temperature 2 Not Plausible
P1428 Volkswagen — Brake System Vacuum Pump Activation Short To Ground

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.