P1428 Buick 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 Buick 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.
Code P1428 Buick Description
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.
What are the Possible Causes of the DTC P1428 Buick?
- 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 Buick?
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 Buick 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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Frequently Asked Questions about P1428 Buick Code
What does the OBDII code P1428 mean on a Buick?
P1428 indicates an issue where the EGR Temperature Sensor 1 and Intake Air Temperature 2 readings are not plausible, meaning their values are inconsistent or out of range.
What are the common symptoms of the P1428 code on a Buick?
Symptoms may include the check engine light turning on, poor engine performance, rough idling, increased emissions, and possibly reduced fuel efficiency.
What causes the P1428 code to appear?
Common causes include a faulty EGR temperature sensor, a malfunctioning intake air temperature sensor, wiring or connector issues, or a problem with the vehicle’s ECM.
Can I drive my Buick with a P1428 code?
While it may be safe to drive short distances, driving for extended periods without addressing the issue could lead to reduced engine performance and potential damage to the emissions system.
How do I diagnose the P1428 code on my Buick?
Start by checking the EGR temperature sensor and intake air temperature sensor for proper operation, inspecting wiring and connectors for damage, and using a scan tool to monitor sensor data.
How can I fix the P1428 code on a Buick?
Repairs may include replacing a faulty EGR temperature sensor, intake air temperature sensor, repairing damaged wiring, or reprogramming the ECM if necessary.
What tools are needed to troubleshoot the P1428 code?
You’ll need an OBDII scan tool, a multimeter to check electrical connections, and possibly a repair manual specific to your Buick model for sensor testing procedures.
How much does it cost to fix the P1428 code on a Buick?
Costs can vary depending on the issue, but sensor replacement may range from $50 to $300, while wiring repairs or ECM reprogramming can add to the expense.
Can a dirty EGR valve cause the P1428 code?
A dirty or clogged EGR valve can indirectly contribute to the code if it affects the EGR temperature sensor’s readings, but the code typically relates to sensor or wiring issues.
Is the P1428 code related to emissions testing?
Yes, since it involves the EGR system and intake air temperature sensors, the P1428 code can cause increased emissions and may result in a failed emissions test.
Discuss the causes and fixes for P1428 Buick OBDII Code
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