P067E — Cylinder 6 Glow Plug Control Circuit Low #
The code label may vary depending on the manufacturer.
- P067E: Cylinder 6 Glow Plug Control Circuit Low (General/Generic OBD-II)
- P067E: Cylinder 6 Glow Plug Circuit Low (Ford, GM, Chrysler, Mercedes-Benz, etc.)
- P067E: Glow Plug Circuit Low – Cylinder 6 (Volkswagen/Audi)
- P067E: Low Voltage at Cylinder 6 Glow Plug Circuit (BMW, Land Rover)
Summary for code P067E #
P067E is an OBD-II trouble code indicating a low voltage or resistance condition in the glow plug control circuit for cylinder 6. A glow plug is a heating device used in diesel engines to assist cold starts by warming the air in the combustion chamber. The control circuit refers to the electrical pathway managed by the Powertrain Control Module (PCM) that activates the glow plug. When the PCM detects that the voltage in this circuit is lower than expected, it sets P067E and illuminates the check engine light. This code points specifically to cylinder 6, helping narrow the diagnostic focus.
Common symptoms for code P067E #
The most apparent symptom of a P067E code is trouble starting the engine, especially in cold weather. You may also notice rough idling, increased exhaust smoke, or even a drop in performance until the engine warms up. However, some drivers might only see the check engine light without any clear drivability issues, particularly in milder climates or after a short stop.
- Hard starting, especially when cold
- Rough idle after cold start
- Increased white smoke from exhaust on startup
- Check engine light illuminated
- Possible slight loss of power while warming up
Probable causes for code P067E (in order of likelihood) #
While the glow plug itself is often the culprit, issues can also arise from the circuit that controls it. Diagnosing the cause requires methodically eliminating possibilities, starting with the most common and working toward the less frequent.
- Failed or worn-out glow plug (Cylinder 6)
- Faulty glow plug control module or relay
- Wiring or connector problems (corrosion, damage, loose pins) in cylinder 6 glow plug circuit
- PCM (Powertrain Control Module) malfunction (rare)
Step-by-step diagnosis for code P067E #
A systematic approach ensures you won’t overlook a simple fix. Always begin with the basics—visual checks—before reaching for advanced diagnostic tools. Here’s a proven step-by-step:
- Read and record all active DTCs with a professional scan tool; check for related codes (especially P0670–P067F or other cylinder-specific glow plug codes).
- Inspect glow plug wiring and connectors at cylinder 6 for corrosion, damage, or loose pins; repair as needed.
- Test cylinder 6 glow plug resistance (typically should be 0.5–2.0 ohms when cold; check your OEM specs).
- Check for voltage at the glow plug terminal during glow cycle (key ON, engine cold); compare readings to other cylinders.
- Test the glow plug control module or relay output for cylinder 6; swap with another cylinder if possible.
- If all components test OK, verify PCM output and wiring continuity between PCM and glow plug control circuit.
Possible repairs for code P067E #
Repairs should directly address the confirmed root cause. Most cases are resolved by replacing a faulty glow plug, but wiring or control module issues are not uncommon, especially in older or high-mileage vehicles.
- Replace the cylinder 6 glow plug if resistance is out of specification or open circuit
- Repair or replace damaged wiring/connectors in the cylinder 6 glow plug circuit
- Replace the glow plug control module or relay if it fails output tests
- Address PCM faults or update software if confirmed by OEM diagnostic procedure (rare)
Is it safe to drive with code P067E? #
Limited. While driving with a single faulty glow plug usually won’t cause immediate engine damage, cold starting will be more difficult and may lead to increased emissions (white smoke) and rough running until the engine warms up. If you live in a cold climate or frequently make short trips, it’s best to fix this promptly to avoid excessive stress on the starter, battery, and other glow plugs. In warm climates, you may not notice symptoms, but the check engine light will remain on.
Vehicles most commonly affected by code P067E #
This code is most commonly seen on diesel-powered vehicles with individual glow plug circuit monitoring, especially those from the mid-2000s onward. Some manufacturers are more likely to report cylinder-specific glow plug codes.
- Ford Super Duty Diesel (F-250, F-350, F-450, etc.)
- Chevrolet/GMC Duramax Diesel (Silverado, Sierra, Express, Savana)
- Ram 2500/3500 Cummins Diesel
- Mercedes-Benz Sprinter (and related Freightliner/Dodge models)
- Volkswagen TDI (Passat, Jetta, Golf, Transporter)
- BMW, Land Rover, and Jaguar diesels (select models)
Common mistakes & best practices for code P067E #
Misdiagnosis often stems from skipping basic checks or replacing parts prematurely. Follow a logical process and use a quality digital multimeter to avoid extra expense and headaches.
- Replacing the glow plug without checking wiring/connectors (corrosion is common, especially in harsh climates)
- Assuming the control module is bad before testing the glow plug itself
- Not verifying the correct cylinder location (cylinder numbering varies—always check OEM diagrams)
- Failing to clear the code and test drive after repairs (the PCM may need a key cycle or brief drive to re-test the circuit)
Quick FAQ for code P067E #
Here are some answers to common questions about this code:
- Q: Can a bad glow plug cause engine damage?
A: Not directly, but repeated hard starts can strain your starter and battery. Unburned fuel during cold starts may also contaminate engine oil over time. - Q: Do all diesel vehicles monitor each glow plug separately?
A: No. Some older systems only monitor the overall circuit. Modern vehicles often monitor each plug, allowing for specific cylinder codes like P067E. - Q: Can I ignore this code in summer?
A: Symptoms are less noticeable in warm weather, but the code will remain and you’ll fail emissions tests in many states. It’s best to repair it soon.
