P242C 2017 GMC Sierra Code - Exhaust Gas Temperature Sensor 3 Circuit Low Voltage
Quick Answer
The Exhaust Gas Temperature sensors (EGTS) are variable resistors that measure the temperature of the exhaust gas. Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) 3, Exhaust Gas Temperature Sensor 3 harness is open or shorted, Exhaust Gas Temperature Sensor 3 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
- P242C 2017 GMC Sierra indicates Exhaust Gas Temperature Sensor 3 Circuit Low Voltage.
- Common causes
- Common causes include Faulty Exhaust Gas Temperature Sensor (EGTS) 3, Exhaust Gas Temperature Sensor 3 harness is open or shorted, Exhaust Gas Temperature Sensor 3 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 P242C 2017 GMC Sierra Description
What are the Possible Causes of the DTC P242C 2017 GMC Sierra?
- Faulty Exhaust Gas Temperature Sensor (EGTS) 3
- Exhaust Gas Temperature Sensor 3 harness is open or shorted
- Exhaust Gas Temperature Sensor 3 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P242C 2017 GMC Sierra?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P242C 2017 GMC Sierra 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 P242C 2017 GMC Sierra Code
1. What does the OBDII code P242C mean on a 2017 GMC Sierra?
P242C indicates a low voltage issue in the circuit for Exhaust Gas Temperature (EGT) Sensor 3, which monitors the temperature of exhaust gases to ensure proper emissions control.
2. What are the symptoms of the P242C code on a 2017 GMC Sierra?
Common symptoms include a check engine light, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.
3. What causes the P242C code to appear?
Potential causes include a faulty EGT sensor 3, damaged wiring or connectors, soot buildup on the sensor, or issues with the vehicle's PCM (Powertrain Control Module).
4. How can I diagnose the P242C code?
Start by inspecting the wiring and connectors for damage or corrosion, testing the EGT sensor with a multimeter, and checking for exhaust leaks near the sensor.
5. Can I drive with the P242C code?
Driving with this code is not recommended, as it may lead to increased emissions, reduced performance, or damage to the exhaust system.
6. How do I fix the P242C code on my 2017 GMC Sierra?
Repairs may include replacing the faulty EGT sensor 3, repairing damaged wiring, cleaning the sensor to remove soot buildup, or updating/reprogramming the PCM if necessary.
7. Where is Exhaust Gas Temperature Sensor 3 located on a 2017 GMC Sierra?
Sensor 3 is typically located in the exhaust system downstream of the DPF (Diesel Particulate Filter), but consult a repair manual for exact placement.
8. How much does it cost to fix the P242C code?
Repair costs can range from $100 to $400, depending on whether the sensor, wiring, or PCM requires replacement or repair.
9. Can a dirty or clogged DPF cause the P242C code?
Yes, a clogged DPF can cause abnormal exhaust temperatures, potentially triggering this code.
10. Will clearing the code with a scanner fix the P242C issue?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be addressed to prevent the code from returning.
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