The P051E: Crankcase Pressure Sensor Circuit Intermittent/Erratic refers to a problem where the crankcase pressure sensor is providing intermittent or erratic signals. This may result in improper engine pressure management, potentially leading to performance issues, oil leaks, or increased engine wear.
P051E – Quick Overview
| Code | Information |
|---|---|
| Meaning | P051E: Crankcase Pressure Sensor Circuit Intermittent/Erratic |
| Is it serious? | Yes, intermittent readings can cause improper engine pressure management, leading to potential engine damage. |
| Possible causes | – Faulty crankcase pressure sensor – Loose or damaged wiring – Faulty ECM |
| How to diagnose? | – Test the crankcase pressure sensor for intermittent issues – Inspect wiring and connectors for damage – Check the ECM for faults |
P051E Meaning
The P051E: Crankcase Pressure Sensor Circuit Intermittent/Erratic code is triggered when the ECM detects erratic or intermittent readings from the crankcase pressure sensor. This sensor is responsible for monitoring crankcase pressure, and inconsistent signals can affect engine performance, cause oil leaks, or result in long-term damage if not addressed.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any related fault codes that may give further insight into the issue. | OBD-II Scanner |
| Inspect the Crankcase Pressure Sensor | Visually inspect the sensor for signs of wear, damage, or improper installation. | Flashlight, Safety Gloves |
| Test the Crankcase Pressure Sensor for Intermittent Issues | Use a diagnostic tool or multimeter to check the sensor for intermittent signal failures or erratic readings. | Multimeter, Diagnostic Tool |
| Inspect Wiring and Connectors | Check the wiring and connectors for any signs of loose connections, damage, or corrosion that could cause intermittent faults. | Flashlight, Multimeter |
| Check the ECM for Faults | Test the ECM for any malfunctions that could be causing the crankcase pressure sensor to behave erratically. | OBD-II Scanner, Multimeter |
| Clear the Code and Test Drive | After making necessary repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to confirm the issue is resolved. | OBD-II Scanner, Vehicle Manual |
| Recheck for Codes | Re-scan the vehicle after the test drive to ensure that the P051E code hasn’t returned. | OBD-II Scanner |
Free PDF: How to choose OBD2 scanner
I’ve made you a free PDF to choose the OBD2 scanner in 5 minutes.
✅ Which OBD2 scanner is best?
✅ Which type should you get (DIY, Pro, Hobby)
✅ What is the best scanner for the exact brand/feature (e.g best for BMW)
✅ How to get a Bi-Directional tool for as cheap as $40
✅ Discount coupons for scanners
PDF is 100% free and it is designed to help you pick a scanner in less than a few minutes! Not a boring 50-page guide.
Just tell me where to send it.
Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)