The P066C: Cylinder 2 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 2. Glow plugs are critical for starting diesel engines, particularly in cold weather. A low voltage condition could be caused by a faulty glow plug, wiring problems, or an issue within the glow plug control module.
P066C – Quick Overview
| Code | Information |
|---|---|
| Meaning | P066C: Cylinder 2 Glow Plug Control Circuit Low |
| Is it serious? | Yes, as it can result in hard starting or failure to start the engine, especially in cold conditions. |
| Possible causes | – Low voltage in the cylinder 2 glow plug control circuit – Faulty glow plug – Wiring issue |
| How to diagnose? | – Test cylinder 2 glow plug control circuit for voltage – Inspect wiring and connectors – Replace glow plug if necessary |
P066C Meaning
The P066C code signifies that there is a low voltage issue in the glow plug control circuit for cylinder 2. This condition can prevent the glow plug from generating sufficient heat, making it difficult for the engine to start, particularly in cold weather. Resolving this issue is essential for optimal engine performance and starting reliability.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional codes related to the glow plug system or electrical system issues. These can help further diagnose the problem. | OBD-II Scanner |
| Test the Cylinder 2 Glow Plug Control Circuit for Voltage | Use a multimeter to measure the voltage in the glow plug control circuit for cylinder 2. Compare the readings to the manufacturer’s specifications to ensure proper voltage. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors for damage, loose connections, or corrosion in the glow plug control circuit for cylinder 2, which could cause low voltage. | Flashlight, Multimeter |
| Test the Glow Plug for Cylinder 2 | Test the glow plug in cylinder 2 to ensure it is functioning properly. If it is not generating the required heat, replace it. | Diagnostic Tool, Multimeter |
| Replace the Glow Plug if Necessary | If the glow plug for cylinder 2 is found to be faulty or underperforming, replace it to restore proper functionality, especially for cold starts. | 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 glow plug control circuit for cylinder 2 is functioning correctly. | OBD-II Scanner, Vehicle Manual |
OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes
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