The P067A: Cylinder 4 Glow Plug Control Circuit Low code indicates that the control module has detected a low voltage condition in the glow plug control circuit for cylinder 4. This may result in the glow plug not reaching the required temperature to aid in engine starting, especially in cold conditions. Common causes include a faulty glow plug, wiring issues, or a problem with the glow plug control circuit.
P067A – Quick Overview
| Code | Information |
|---|---|
| Meaning | P067A: Cylinder 4 Glow Plug Control Circuit Low |
| Is it serious? | Yes, as it can lead to hard starting, particularly in cold conditions. |
| Possible causes | – Low 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 |
P067A Meaning
The P067A code indicates that the voltage in the control circuit for cylinder 4’s glow plug is lower than expected. This low voltage condition can prevent the glow plug from reaching its necessary operating temperature, making engine starting more difficult, especially in cold weather.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional related codes, particularly those concerning the glow plug system or electrical circuits. | 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. Ensure that it matches the manufacturer’s specifications. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors leading to the cylinder 4 glow plug for signs of damage, corrosion, or loose connections that could cause low voltage. | Flashlight, Multimeter |
| Test the Glow Plug for Cylinder 4 | Test the glow plug in cylinder 4 to ensure it is functioning correctly and heating as required. Replace the glow plug if necessary. | Diagnostic Tool, Multimeter |
| Replace the Glow Plug if Necessary | If the glow plug for cylinder 4 is found to be faulty, replace it to restore proper starting performance, especially in cold weather. | 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 properly. | OBD-II Scanner, Vehicle Manual |
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