The P068C: Cylinder 7 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 7. This can cause the glow plug to fail to heat properly, resulting in difficulties starting the engine, especially in cold weather. Common causes include a faulty glow plug, wiring issues, or a malfunction in the control circuit.
P068C – Quick Overview
| Code | Information |
|---|---|
| Meaning | P068C: Cylinder 7 Glow Plug Control Circuit Low |
| Is it serious? | Yes, as it can cause hard engine starts, particularly in cold weather. |
| Possible causes | – Low voltage in the cylinder 7 glow plug control circuit – Faulty glow plug – Wiring issue |
| How to diagnose? | – Test cylinder 7 glow plug control circuit for voltage – Inspect wiring and connectors – Replace glow plug if necessary |
P068C Meaning
The P068C code indicates that the control module has detected that the voltage in the glow plug control circuit for cylinder 7 is lower than expected. Low voltage can prevent the glow plug from heating up properly, leading to poor engine starting performance, 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, especially those affecting the glow plug system or electrical faults. | OBD-II Scanner |
| Test the Cylinder 7 Glow Plug Control Circuit for Voltage | Use a multimeter to measure the voltage in the glow plug control circuit for cylinder 7. Compare the readings with the manufacturer’s specifications to verify proper voltage levels. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors leading to cylinder 7’s glow plug for any signs of damage, loose connections, or corrosion that could cause a drop in voltage. | Flashlight, Multimeter |
| Test the Glow Plug for Cylinder 7 | Test the glow plug in cylinder 7 to ensure it is functioning properly and heating correctly. If the glow plug is faulty, replace it. | Diagnostic Tool, Multimeter |
| Replace the Glow Plug if Necessary | If the glow plug for cylinder 7 is faulty, replace it to restore proper engine starting performance, particularly in cold weather conditions. | 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 the cylinder 7 glow plug control circuit is functioning correctly. | OBD-II Scanner, Vehicle Manual |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko