P067C - Understanding DTC P067C: Glow Plug Control Circuit Range/Performance Problem in Diesel Engines

Quick Answer

P067C means: P067C indicates a problem with the glow plug control circuit in diesel engines.

Fix: Check and replace faulty components Cost: $200 - $500 Time: 90-180 minutes

Can I drive with P067C? Immediate attention is advised to prevent starting and performance issues.

Common Questions

What does P067C mean and how does it affect my car?

DTC P067C indicates a problem with the glow plug control circuit, which is crucial for starting diesel engines. If this code appears, your vehicle may struggle to start, especially in cold weather, and you could experience rough idling and decreased fuel efficiency. It's vital to address this code promptly to avoid more serious engine problems.

What are the most common causes of P067C and how much does it cost to fix?

The most common cause of P067C is faulty glow plugs, which can cost between $200 and $500 to replace. Other issues, like damaged wiring, may cost around $100 to $300 to repair. If the engine control module is faulty, repairs could range from $500 to $1200. It’s best to get a diagnostic to identify the specific issue.

Can I drive my car with P067C or should I stop immediately?

While you may be able to drive your vehicle with a P067C code, it is not advisable. You may experience starting difficulties and reduced performance, which can worsen over time. It’s best to have the issue diagnosed and repaired as soon as possible to avoid further complications.

How can I diagnose P067C myself using GeekOBD APP?

To diagnose P067C using the GeekOBD APP, start by connecting the app to your vehicle's OBD2 port. Use the app to scan for diagnostic trouble codes, which will help you identify not only P067C but also other related codes. Review the freeze frame data to understand the conditions under which the fault occurred, and follow the app's recommendations for further testing.

What vehicles are most commonly affected by P067C?

P067C is commonly found in diesel vehicles such as the 2011-2016 Ford F-250, 2013-2018 Chevrolet Silverado 2500, and 2010-2016 Ram 2500. If you own one of these models, it's wise to be aware of this code and its implications for your vehicle’s performance.

How can I prevent P067C from happening again?

To prevent P067C from recurring, ensure regular maintenance of your vehicle, including timely replacement of glow plugs and inspection of wiring connections. Keeping your battery in good condition also helps, as a weak battery can affect glow plug performance. Finally, consider using high-quality fuel to maintain the integrity of your fuel system.

What is P067C?

DTC P067C is a diagnostic trouble code that indicates a problem with the glow plug control circuit, specifically in relation to its performance or range. This code is primarily associated with diesel engines, which rely on glow plugs to preheat the combustion chamber for easier starting, especially in colder conditions. When the engine control module (ECM) detects a malfunction in the glow plug system, it triggers the P067C code. This could mean that the glow plugs themselves are faulty, there are issues with the wiring or connectors, or the ECM is not functioning correctly. If left unresolved, this issue can lead to hard starting, increased emissions, and reduced fuel efficiency. Commonly, this code appears in vehicles like the 2011-2016 Ford F-250, 2013-2018 Chevrolet Silverado 2500, and 2010-2016 Ram 2500. Drivers may notice symptoms such as difficulty starting the engine, rough idling, or a significant drop in fuel economy, indicating an urgent need for diagnosis and repair. Ignoring this code can result in more severe engine issues over time, emphasizing the importance of timely intervention.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P067C is present:

  • Check engine light illuminates and remains on, signaling a system malfunction.
  • Engine struggles to start, especially in cold weather, leading to frustration during morning commutes.
  • Rough idling or misfiring after starting, which can be felt as vibrations throughout the vehicle.
  • Fuel economy decreases significantly, potentially by 10-20%, impacting your monthly fuel expenses.
  • Increased emissions may lead to failing an emissions test, causing further complications.

Possible Causes

Most common causes of P067C (ordered by frequency):

  1. Faulty glow plugs are the most common cause, accounting for about 60% of P067C occurrences. When glow plugs fail, they cannot heat the combustion chamber effectively, leading to starting issues.
  2. Wiring issues, such as damaged or corroded wires, can cause poor conductivity. This accounts for around 25% of cases, where the electrical connection to the glow plugs is compromised, preventing them from functioning correctly.
  3. A malfunctioning engine control module (ECM) is also a possible cause, though less common. This can lead to incorrect signals being sent to the glow plugs.
  4. Less common causes include blown fuses affecting the glow plug circuit, which can be easily checked and replaced.
  5. Rarely, issues with the fuel system can lead to starting problems that mimic P067C symptoms, requiring a more thorough diagnostic approach.

P067C Repair Costs

Cost Breakdown by Repair Type

Glow Plug Replacement

Replacing faulty glow plugs with new OEM parts.

  • Total: $200 - $500
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring or connectors in the glow plug circuit.

  • Total: $100 - $300
  • Success rate: 80%
ECM Replacement

Replacing or reprogramming the engine control module if found faulty.

  • Total: $500 - $1200
  • Success rate: 75%
Money-Saving Tips for P067C
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P067C Diagnosis Process

Follow these systematic steps to accurately diagnose P067C. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter to check the resistance of the glow plugs and ensure they are within manufacturer specifications (20-30 minutes)

Step 3: Component testing - Use a multimeter to check the resistance of the glow plugs and ensure they are within manufacturer specifications (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP to ensure no further issues arise (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP to ensure no further issues arise (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor for any returning symptoms (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and monitor for any returning symptoms (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: Glow Plug Replacement on 2014 Ford F-250

Vehicle: 2014 Ford F-250, 85,000 miles

Problem: The customer reported difficulty starting the engine, particularly in cold weather, and a persistent check engine light.

Diagnosis: After scanning with the GeekOBD APP, the P067C code was present along with other related codes. A visual inspection revealed corroded wiring and faulty glow plugs.

Solution: Replaced all four glow plugs and repaired the damaged wiring harness.

Cost: $400 (including parts and labor)

Result: The vehicle started reliably afterward, with improved fuel efficiency and no further codes.

Case Study 2: Wiring Repair on 2016 Chevrolet Silverado 2500

Vehicle: 2016 Chevrolet Silverado 2500, 50,000 miles

Problem: The driver experienced rough idling and a check engine light, with issues starting the truck in cold weather.

Diagnosis: The GeekOBD APP indicated a P067C code. Further inspection found damaged wires leading to the glow plug circuit.

Solution: Replaced damaged wiring and connectors in the glow plug circuit.

Cost: $150 (parts and labor)

Result: The truck's performance improved significantly, with smooth operation and reliable starts.

Diagnose P067C

Use GeekOBD APP for professional diagnosis!

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  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: P067C
System: Powertrain (Engine, Transmission, Emissions)
Severity: HIGH
Category: Engine Codes