P06CB GMC Code - Cylinder 7 Glow Plug Incorrect
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #1 glow plug, Cylinder #1 glow plug harness is open or shorted, Cylinder #1 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
- P06CB GMC indicates Cylinder 7 Glow Plug Incorrect.
- Common causes
- Common causes include Faulty cylinder #1 glow plug, Cylinder #1 glow plug harness is open or shorted, Cylinder #1 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 P06CB GMC 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. A Diagnostic Trouble Code (DTC) will be set if the Glow Plug resistance is not within a calibrated range.
What are the Possible Causes of the DTC P06CB GMC?
- Faulty cylinder #1 glow plug
- Cylinder #1 glow plug harness is open or shorted
- Cylinder #1 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P06CB GMC?
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 P06CB GMC 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 GMC Models
- P06CB 2014 GMC Sierra — Cylinder 7 Glow Plug Incorrect
- P06CB 2015 GMC Sierra — Cylinder 7 Glow Plug Incorrect
- P06CB 2016 GMC Sierra — Cylinder 7 Glow Plug Incorrect
- P06CB 2017 GMC Sierra — Cylinder 7 Glow Plug Incorrect
- P06CB 2018 GMC Sierra — Cylinder 7 Glow Plug Incorrect
Frequently Asked Questions about P06CB GMC Code
1. What does the OBDII code P06CB mean for a GMC vehicle?
P06CB indicates that the Engine Control Module (ECM) has detected an issue with the operation of the glow plug in cylinder 7.
2. What are the common symptoms of code P06CB in a GMC?
Symptoms may include difficulty starting the engine in cold weather, reduced engine performance, an illuminated check engine light, and increased emissions.
3. What causes the P06CB code to appear?
Common causes include a faulty glow plug in cylinder 7, damaged glow plug wiring, a malfunctioning glow plug control module, or corrosion in the electrical connectors.
4. Can I keep driving my GMC with a P06CB code?
While the vehicle may still operate, driving with a faulty glow plug can lead to poor cold starts, reduced fuel efficiency, and potential long-term engine damage.
5. How is the P06CB code diagnosed?
Diagnosis typically involves inspecting the glow plug, wiring, and connectors for damage or corrosion, testing the glow plug for proper resistance, and checking the glow plug control module.
6. How do you fix the P06CB code on a GMC?
Repairs may include replacing the faulty glow plug, repairing damaged wiring, cleaning corroded connectors, or replacing the glow plug control module if necessary.
7. How much does it cost to fix a P06CB code on a GMC?
Repair costs can vary, but replacing a glow plug typically ranges from $100 to $300, depending on parts and labor rates.
8. What tools are needed to test the glow plug for cylinder 7?
A multimeter is commonly used to measure the resistance of the glow plug to determine if it is functioning correctly.
9. Can a P06CB code trigger other engine issues?
Yes, unresolved glow plug issues can cause incomplete combustion, leading to rough idling, higher emissions, and potential damage to other engine components over time.
10. Is a P06CB code more likely to appear in cold weather?
Yes, glow plugs are critical for starting diesel engines in cold conditions, so issues with them are more noticeable during colder temperatures.
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