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

Code P1428 GMC Possible Causes

• 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 do I Fix the Code P1428 GMC?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the Cost to Diagnose the Code P1428 GMC?

Labor: 1.0

The cost of diagnosing the P1428 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

What are Code P1428 GMC Possible Symptoms?

• Engine Light ON (or Service Engine Soon Warning Light)

Code P1428 GMC 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.

Need More Information on the P1428 GMC Code?

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