P068E 2017 GMC Sierra Code - Cylinder 8 Glow Plug Control Circuit Low Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #8 glow plug, Cylinder #8 glow plug harness is open or shorted, Cylinder #8 glow plug 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
- P068E 2017 GMC Sierra indicates Cylinder 8 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty cylinder #8 glow plug, Cylinder #8 glow plug harness is open or shorted, Cylinder #8 glow plug 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 P068E 2017 GMC Sierra Description
Control of the glow plugs is accomplished by the Glow Plug Control Module. The nominal voltage for the glow plugs is 5.4 volts. When the ignition is turned On, the Glow Plug Control Module applies 7.2 V for 2.2 s, then 5.7 V for 0.8 s, and then 5.4 V until 1200°C (2192°F) is reached. The maximum voltage of the system is 10 V. While the engine is running the voltage will vary between 4.7 - 10 V when in closed loop control to maintain a glow plug temperature that ranges from 1150° - 1180°C (2102° - 2156°F). The temperature and the power consumption are controlled between the Engine Control Module (ECM) and the Glow Plug Control Module within a wide range to suit the engine's pre-heating requirements. Each glow plug is energized individually. This capability yields more optimum heat times for the glow plugs, thus pre - glow times can be kept to a minimum for a short wait to crank times and maximum glow plug durability.
What are the Possible Causes of the DTC P068E 2017 GMC Sierra?
- Faulty cylinder #8 glow plug
- Cylinder #8 glow plug harness is open or shorted
- Cylinder #8 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P068E 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P068E 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 P068E 2017 GMC Sierra Code
1. What are common symptoms of an OBDII code P068E in a 2017 GMC Sierra related to the Cylinder 8 Glow Plug Control Circuit?
- Common symptoms include rough idling, reduced engine performance, and the illumination of the check engine light.
2. What are the potential causes of the Cylinder 8 Glow Plug Control Circuit Low Voltage issue in a 2017 GMC Sierra?
- Possible causes include a faulty glow plug, damaged wiring or connectors, a malfunctioning glow plug control module, or issues with the vehicle's ECM.
3. How can I diagnose the Cylinder 8 Glow Plug Control Circuit Low Voltage problem in my 2017 GMC Sierra?
- Use a diagnostic scanner to retrieve the OBDII code P068E, visually inspect the glow plug and its connections, test the glow plug control module, and check for any wiring issues.
4. Can I continue driving my 2017 GMC Sierra with the P068E OBDII code related to the Cylinder 8 Glow Plug Control Circuit?
- It is not recommended to drive the vehicle with this issue, as it can lead to poor engine performance and potential damage if left unresolved.
5. What is the typical repair process for fixing the Cylinder 8 Glow Plug Control Circuit Low Voltage problem in a 2017 GMC Sierra?
- The repair process usually involves replacing the faulty glow plug, repairing or replacing damaged wiring or connectors, and possibly replacing the glow plug control module if necessary.
6. Are there any DIY tips for addressing the P068E OBDII code in a 2017 GMC Sierra?
- DIY enthusiasts with automotive repair experience can attempt to inspect and replace the glow plug themselves, but diagnosing wiring or control module issues may require professional help.
7. How much does it cost to repair the Cylinder 8 Glow Plug Control Circuit Low Voltage issue in a 2017 GMC Sierra?
- The cost of repairs can vary depending on the extent of the issue and whether you perform the repairs yourself or take the vehicle to a mechanic. Costs may include parts and labor.
8. Can extreme weather conditions affect the Cylinder 8 Glow Plug Control Circuit in a 2017 GMC Sierra?
- Yes, extreme cold weather can put additional strain on the glow plug system, potentially leading to issues like the low voltage condition indicated by the P068E code.
9. Will disconnecting the battery reset the P068E OBDII code in a 2017 GMC Sierra?
- Disconnecting the battery may temporarily clear the code, but it is not a proper fix for the underlying issue causing the Cylinder 8 Glow Plug Control Circuit Low Voltage problem.
10. Is the Cylinder 8 Glow Plug Control Circuit Low Voltage issue a common problem in 2017 GMC Sierra vehicles?
- While not extremely common, issues with glow plugs and control circuits can occur in diesel vehicles like the 2017 GMC Sierra, especially with age or high mileage.
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