P242D 2016 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit High Voltage
Quick Answer
The P242D diagnostic trouble code (DTC) for a 2016 GMC Sierra specifically refers to the Exhaust Gas Temperature Sensor 3 Circuit High Voltage. Common causes include Faulty Exhaust Gas Temperature Sensor: The sensor itself may be malfunctioning, sending incorrect voltage signals to the ECM, Wiring Issues: Damaged or corroded wiring connections between the sensor and the ECM can cause high voltage readings, ECM Malfunction: A faulty engine control module may not be interpreting the sensor data correctly, leading to the P242D code. 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
- P242D 2016 GMC Sierra indicates Exhaust Gas Temperature Sensor 3 Circuit High Voltage.
- Common causes
- Common causes include Faulty Exhaust Gas Temperature Sensor: The sensor itself may be malfunctioning, sending incorrect voltage signals to the ECM, Wiring Issues: Damaged or corroded wiring connections between the sensor and the ECM can cause high voltage readings, ECM Malfunction: A faulty engine control module may not be interpreting the sensor data correctly, leading to the P242D code.
- 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 P242D 2016 GMC Sierra Description
The P242D diagnostic trouble code (DTC) for a 2016 GMC Sierra specifically refers to the Exhaust Gas Temperature Sensor 3 Circuit High Voltage. This code indicates that the exhaust gas temperature sensor located after the diesel particulate filter (DPF) is detecting a higher than normal voltage signal. The exhaust gas temperature sensor is a crucial component in monitoring the temperature of the exhaust gases to ensure optimal performance and emissions control.
Common Causes of P242D 2016 GMC Sierra
- Faulty Exhaust Gas Temperature Sensor: The sensor itself may be malfunctioning, sending incorrect voltage signals to the ECM.
- Wiring Issues: Damaged or corroded wiring connections between the sensor and the ECM can cause high voltage readings.
- ECM Malfunction: A faulty engine control module may not be interpreting the sensor data correctly, leading to the P242D code.
- Exhaust System Leaks: Leaks in the exhaust system can affect the sensor's readings, causing high voltage signals.
- DPF Issues: Problems with the diesel particulate filter, such as clogging or damage, can impact the exhaust gas temperature sensor's performance.
Symptoms of P242D 2016 GMC Sierra
- Check Engine Light: The most common symptom associated with the P242D code is the illumination of the check engine light on the vehicle's dashboard.
- Reduced Engine Performance: The vehicle may experience a decrease in power and overall performance due to incorrect fueling and timing adjustments.
- Increased Emissions: A malfunctioning exhaust gas temperature sensor can lead to higher emissions output, potentially causing the vehicle to fail emissions tests.
- Regeneration Issues: The DPF regeneration process may be affected, leading to incomplete regeneration cycles and potential clogging of the DPF.
How to Fix P242D 2016 GMC Sierra
- Diagnostic Scan: Use a diagnostic scan tool to retrieve the P242D code and any related codes to pinpoint the exact issue.
- Inspect Sensor and Wiring: Check the exhaust gas temperature sensor and its wiring for any visible damage or corrosion. Replace or repair as necessary.
- Check DPF: Inspect the diesel particulate filter for any clogs or damage that may be affecting the sensor's readings.
- Clear Codes: Clear the DTCs from the ECM after completing repairs and test drive the vehicle to ensure the issue has been resolved.
- Relearn Procedure: Perform any necessary relearn procedures for the ECM to recalibrate sensor data and ensure proper operation.
Cost to Fix P242D 2016 GMC Sierra
The typical repair costs for addressing a P242D code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty exhaust gas temperature sensor can cost between $100 and $300, including parts and labor. If wiring repairs or ECM replacement are necessary, the total repair costs can range from $200 to $800 or more.
Tech Notes for P242D 2016 GMC Sierra
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Frequently Asked Questions about P242D 2016 GMC Sierra Code
1. What does the OBDII code P242D mean on a 2016 GMC Sierra?
P242D indicates a high voltage issue in the circuit for the Exhaust Gas Temperature (EGT) Sensor 3, which monitors exhaust gas temperatures to optimize emissions and engine performance.
2. What are the common symptoms of code P242D on a 2016 GMC Sierra?
Symptoms may include the check engine light turning on, decreased fuel efficiency, poor engine performance, or the vehicle entering limp mode.
3. What causes the P242D code to appear on my 2016 GMC Sierra?
Common causes include a faulty EGT sensor, damaged wiring or connectors, a short circuit in the sensor circuit, or an issue with the powertrain control module (PCM).
4. Can I drive my 2016 GMC Sierra with a P242D code?
While the vehicle may still be drivable, prolonged operation with this code can lead to increased emissions, reduced performance, or further damage to the exhaust or emissions systems.
5. How can I diagnose the P242D code on my 2016 GMC Sierra?
Diagnosis may involve using an OBDII scanner to confirm the code, visually inspecting the EGT sensor and wiring for damage, and testing the sensor’s resistance and voltage output with a multimeter.
6. How is the P242D code fixed on a 2016 GMC Sierra?
Repairs may include replacing the faulty EGT sensor, repairing or replacing damaged wiring or connectors, or, in rare cases, reprogramming or replacing the PCM.
7. How much does it cost to fix the P242D code on a 2016 GMC Sierra?
The cost typically ranges from $150 to $400, depending on whether the EGT sensor needs replacement or if additional repairs are required for wiring or the PCM.
8. Can a dirty or clogged exhaust system cause the P242D code?
While less common, excessive soot or debris in the exhaust system can affect the EGT sensor’s performance and potentially trigger this code.
9. What tools are needed to troubleshoot the P242D code on a 2016 GMC Sierra?
You will need an OBDII scanner, a multimeter to check voltage and resistance, and possibly a wiring diagram for the EGT sensor circuit.
10. Will clearing the P242D code solve the problem on a 2016 GMC Sierra?
Clearing the code may turn off the check engine light temporarily, but if the underlying issue isn’t addressed, the code is likely to return.
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