P068E Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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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Information for Specific Chevrolet Models
- P068E 2014 Chevrolet Silverado — Cylinder 8 Glow Plug Control Circuit Low Voltage
- P068E 2015 Chevrolet Silverado — Cylinder 8 Glow Plug Control Circuit Low Voltage
- P068E 2016 Chevrolet Silverado — Cylinder 8 Glow Plug Control Circuit Low Voltage
- P068E 2017 Chevrolet Silverado — Cylinder 8 Glow Plug Control Circuit Low Voltage
- P068E 2018 Chevrolet Silverado — Cylinder 8 Glow Plug Control Circuit Low Voltage
Frequently Asked Questions about P068E Chevrolet Code
1. What does the OBDII code P068E mean on a Chevrolet?
P068E indicates a low voltage issue in the Cylinder 8 Glow Plug Control Circuit, typically affecting diesel engines with glow plugs.
2. What are the common symptoms of code P068E on a Chevrolet vehicle?
Symptoms may include difficulty starting the engine, rough idling, reduced engine performance, or an illuminated Check Engine Light.
3. What causes the P068E code in a Chevrolet?
Common causes include a faulty glow plug for cylinder 8, damaged wiring, corroded connections, or a malfunctioning glow plug control module.
4. Can I drive my Chevrolet with a P068E code?
Driving with this code may lead to hard starts and reduced performance, especially in colder weather, but it’s best to address the issue promptly to avoid further damage.
5. How do I diagnose the P068E code on my Chevrolet?
Check the wiring and connectors for damage or corrosion, test cylinder 8’s glow plug for proper resistance, and inspect the glow plug control module for faults.
6. How do I fix the P068E code on a Chevrolet?
Repairs may involve replacing the faulty glow plug, repairing damaged wiring, cleaning corroded connections, or replacing the glow plug control module if necessary.
7. What tools do I need to troubleshoot the P068E code?
You’ll need a multimeter to test resistance, a diagnostic scanner to confirm and clear the code, and basic hand tools for repairs.
8. How much does it cost to fix a P068E code on a Chevrolet?
The cost varies but typically ranges from $50 to $200 for a glow plug replacement, with additional costs if the wiring or control module needs repair.
9. What happens if I ignore the P068E code on my Chevrolet?
Ignoring the code can lead to harder cold starts, increased emissions, and potential damage to other engine components over time.
10. Is the P068E code specific to Chevrolet vehicles?
No, the P068E code can appear on any diesel vehicle with OBDII systems, but its specifics, such as cylinder 8, may vary by engine type and manufacturer.
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