What causes high oil pressure on a Dodge Charger?
High oil pressure in a Dodge Charger is typically caused by sensor or gauge faults, an oil pump relief valve sticking, or using oil with the wrong viscosity. It can also stem from clogged passages or an over-tight filter. This article investigates the main causes, how to diagnose them, and the steps you should take.
Common causes
Here are the most frequent reasons drivers see unusually high oil pressure readings in a Charger. These range from sensor issues to mechanical faults inside the engine oiling system.
- Faulty oil pressure sensor or sending unit, or damaged wiring — this can produce falsely high readings or fail to track actual pressure.
- Oil pump relief valve stuck closed or a weak relief spring — the regulator cannot release excess pressure, causing elevated pressure in the system.
- Incorrect or overly viscous engine oil for the vehicle's climate and engine design — very thick oil can maintain higher pressure, especially during cold starts.
- Blocked or restricted oil passages or a clogged oil filter — a bottleneck can raise pressure upstream of the restriction.
- Overly aggressive or incorrect oil pump installation — such as a high-volume pump with an improper match to the engine’s regulator system.
- Engine sludge or debris in the oil passages — poor maintenance can lead to flow restrictions and pressure anomalies.
In most cases, sensor faults or valve/regulator issues are the first suspects. A genuine mechanical overpressure is less common but can occur with a failed pump or valve.
Note on readings
Dashboard readings can be misleading if wiring, ground, or sensor problems are present. Always confirm suspected high pressure with a mechanical gauge before pursuing repairs.
Diagnosis and verification
To distinguish a sensor fault from a real mechanical issue, you should verify oil pressure with a known-good mechanical gauge and inspect several components.
- Attach a mechanical oil pressure gauge to the engine’s test port and record readings across idle, light, and heavy throttle.
- Inspect the oil pressure sensor wiring for corrosion, pin damage, or loose connections; replace the sender if readings remain abnormal with a healthy mechanical gauge.
- Check oil grade and condition; ensure you’re using the factory-recommended viscosity and that the oil is fresh and free of contaminants.
- Inspect the oil pump and relief valve: if readings remain high with a mechanical gauge, a faulty regulator or pump replacement may be required.
- Evaluate oil filter and passages for sludge or restrictions; replace the filter with a high-quality unit and consider a professional flush if indicated.
After testing, compare the results with the factory specifications for your Charger’s engine; persistent high pressure typically points to a relief valve, pump, or supply-path issue rather than a sensor problem.
What to do if high oil pressure is confirmed
If a real, sustained high oil pressure condition is confirmed, take immediate and careful steps to prevent engine damage. The following actions outline a prudent response.
- Do not drive aggressively or idle for long after confirming high pressure; drive only to a safe location or a service facility if safely possible.
- Replace the faulty sensor/wiring if a sensor fault was identified, then re-check with a mechanical gauge.
- If the mechanical gauge confirms elevated pressure, inspect or replace the oil pump and relief valve, and ensure the correct oil grade is used.
- Clean or flush oil passages if sludge is present; consider a professional service to avoid dislodging debris to critical clearances.
- After any repair, repeat oil pressure measurements with a mechanical gauge to confirm normal operating pressure.
Persistent high oil pressure is not something to ignore; it can be a warning sign of pump or regulator failure and warrants professional evaluation.
Summary
High oil pressure in a Dodge Charger is most often caused by sensor or gauge issues, relief valve or pump faults, or inappropriate oil viscosity. Reliable diagnosis starts with verifying the pressure with a mechanical gauge, followed by inspection of the sensor, oil pump, relief valve, filter, and oil passages. Corrective actions include replacing faulty sensors, repairing or replacing the pump or relief valve, cleaning sludge, and using the recommended oil grade. If you’re unsure, consult a qualified technician to prevent engine damage.
