P068C Chevrolet Code - Cylinder 7 Glow Plug Control Circuit Low Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #7 glow plug, Cylinder #7 glow plug harness is open or shorted, Cylinder #7 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
- P068C Chevrolet indicates Cylinder 7 Glow Plug Control Circuit Low Voltage.
- Common causes
- Common causes include Faulty cylinder #7 glow plug, Cylinder #7 glow plug harness is open or shorted, Cylinder #7 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 P068C 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 P068C Chevrolet?
- Faulty cylinder #7 glow plug
- Cylinder #7 glow plug harness is open or shorted
- Cylinder #7 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P068C 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 P068C 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
- P068C 2014 Chevrolet Silverado — Cylinder 7 Glow Plug Control Circuit Low Voltage
- P068C 2015 Chevrolet Silverado — Cylinder 7 Glow Plug Control Circuit Low Voltage
- P068C 2016 Chevrolet Silverado — Cylinder 7 Glow Plug Control Circuit Low Voltage
- P068C 2017 Chevrolet Silverado — Cylinder 7 Glow Plug Control Circuit Low Voltage
- P068C 2018 Chevrolet Silverado — Cylinder 7 Glow Plug Control Circuit Low Voltage
Frequently Asked Questions about P068C Chevrolet Code
What does the OBDII code P068C mean on a Chevrolet?
P068C indicates a low voltage issue in the Cylinder 7 Glow Plug Control Circuit, which is essential for proper glow plug operation in diesel engines.
What are the symptoms of the P068C code on a Chevrolet?
Common symptoms include difficulty starting the engine, rough idling, decreased fuel efficiency, and possibly an illuminated check engine light.
What causes the P068C code on a Chevrolet?
The code can be caused by a faulty glow plug, damaged wiring or connectors in the circuit, a malfunctioning glow plug control module, or insufficient battery voltage.
Can I drive my Chevrolet with the P068C code?
While your vehicle may still be drivable, operating it with this code can lead to starting difficulties and reduced performance, especially in cold weather.
How do I diagnose the P068C code on a Chevrolet?
Diagnosis involves checking the Cylinder 7 glow plug for proper function, inspecting wiring and connectors for damage, testing the glow plug control module, and ensuring adequate battery voltage.
How do I fix the P068C code on a Chevrolet?
Repairs may include replacing the Cylinder 7 glow plug, repairing or replacing damaged wiring, cleaning corroded connectors, or replacing the glow plug control module.
Does the P068C code only apply to diesel engines?
Yes, this code is specific to diesel engines, as glow plugs are used to assist in starting them by heating the cylinders.
Can a weak battery cause the P068C code on a Chevrolet?
Yes, a weak or failing battery can result in insufficient voltage to the glow plug circuit, triggering the P068C code.
Will clearing the P068C code fix the issue?
Clearing the code will not fix the underlying problem; it will likely return unless the root cause is addressed.
How much does it typically cost to fix the P068C code on a Chevrolet?
Repair costs can vary widely based on the cause, ranging from $50 for a glow plug replacement to $300 or more for a new control module.
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