P067B Code - Cylinder 4 Glow Plug Control Circuit High Voltage
Quick Answer
n the diesel engine, air alone is compressed in the cylinder. Common causes include Faulty cylinder #4 glow plug, Cylinder #4 glow plug harness is open or shorted, Cylinder #4 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
- P067B indicates Cylinder 4 Glow Plug Control Circuit High Voltage.
- Common causes
- Common causes include Faulty cylinder #4 glow plug, Cylinder #4 glow plug harness is open or shorted, Cylinder #4 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 P067B 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 P067B?
- Faulty cylinder #4 glow plug
- Cylinder #4 glow plug harness is open or shorted
- Cylinder #4 glow plug circuit poor electrical connection
- Faulty Glow Plug Control Module
How to Fix the DTC P067B?
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 P067B 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 Makes
- P067B Chevrolet — Cylinder 4 Glow Plug Control Circuit High Voltage
- P067B Ford — Cylinder 4 Glow Plug Control Circuit High
- P067B GMC — Cylinder 4 Glow Plug Control Circuit High Voltage
Frequently Asked Questions about P067B Code
1. What are the common symptoms of OBDII code P067B (Cylinder 4 Glow Plug Control Circuit High Voltage)?
- The common symptoms include rough idling, difficulty starting the engine, decreased fuel efficiency, and the illumination of the check engine light.
2. What are the possible causes of OBDII code P067B?
- The code P067B can be triggered by issues such as a faulty glow plug, damaged wiring in the glow plug circuit, a defective glow plug control module, or a problem with the engine control module (ECM).
3. How can I diagnose the cause of OBDII code P067B?
- To diagnose the issue, you can use a diagnostic scanner to read the trouble codes, visually inspect the glow plug and its wiring, and perform a continuity test to check for any open circuits.
4. Can I still drive my vehicle with OBDII code P067B active?
- It is not recommended to drive your vehicle with code P067B active, as it can lead to potential engine damage and reduced performance. It is best to address the issue promptly.
5. How can I repair OBDII code P067B myself?
- If you have experience working on vehicles, you may be able to replace the faulty glow plug or repair damaged wiring yourself. However, it is advisable to seek professional help for a proper diagnosis and repair.
6. Is it necessary to replace all glow plugs if one is faulty?
- While it is not required to replace all glow plugs if only one is faulty, it is recommended to inspect and potentially replace all glow plugs if they are of similar age and mileage to prevent future issues.
7. How much does it typically cost to repair OBDII code P067B at a repair shop?
- The cost of repairing OBDII code P067B can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor at a repair shop.
8. Can a faulty glow plug cause other engine problems?
- Yes, a faulty glow plug can lead to other engine problems such as misfires, reduced power, poor fuel economy, and potential damage to the engine over time if left unrepaired.
9. How long does it take to repair OBDII code P067B?
- The repair time for OBDII code P067B can vary based on the cause of the issue and the complexity of the repair. It may take anywhere from 1 to 3 hours at a repair shop.
10. Will resetting the OBDII code P067B clear the issue permanently?
- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not addressed and fixed, the code is likely to reappear. It is essential to diagnose and repair the root cause of the problem.
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