The P067B: Cylinder 4 Glow Plug Control Circuit High code indicates that the control module has detected a high voltage condition in the glow plug control circuit for cylinder 4. This can result in the glow plug receiving more voltage than required, potentially damaging the glow plug or preventing it from functioning properly. High voltage issues are commonly caused by a faulty glow plug, wiring problems, or a malfunction in the glow plug control circuit.
P067B – Quick Overview
| Code | Information |
|---|---|
| Meaning | P067B: Cylinder 4 Glow Plug Control Circuit High |
| Is it serious? | Yes, as it can lead to glow plug damage and improper engine starting. |
| Possible causes | – High voltage in the cylinder 4 glow plug control circuit – Faulty glow plug – Wiring issue |
| How to diagnose? | – Test cylinder 4 glow plug control circuit for voltage – Inspect wiring and connectors – Replace glow plug if necessary |
P067B Meaning
The P067B code indicates that the voltage in the control circuit for cylinder 4’s glow plug is higher than expected. This high voltage can damage the glow plug or prevent it from operating correctly, leading to hard engine starts, especially in cold conditions.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional related codes, particularly those linked to the glow plug system or electrical faults. | OBD-II Scanner |
| Test the Cylinder 4 Glow Plug Control Circuit for Voltage | Use a multimeter to measure the voltage in the glow plug control circuit for cylinder 4. Compare the readings to the manufacturer’s specifications to ensure proper voltage levels. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors leading to the glow plug for cylinder 4 for any signs of damage, loose connections, or corrosion that could cause high voltage. | Flashlight, Multimeter |
| Test the Glow Plug for Cylinder 4 | Test the glow plug in cylinder 4 to ensure it is not damaged by excessive voltage. Replace the glow plug if necessary. | Diagnostic Tool, Multimeter |
| Replace the Glow Plug if Necessary | If the glow plug for cylinder 4 is faulty due to high voltage, replace it to restore proper engine starting performance. | Replacement Glow Plug, Tools |
| Clear the Code and Test | After repairs, clear the code using an OBD-II scanner and test the vehicle to ensure that the cylinder 4 glow plug control circuit is functioning correctly. | OBD-II Scanner, Vehicle Manual |
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