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P0198 Fault Code on 2010 Dodge Charger 5.7L: Causes and Diagnosis Guide

Model: dodge charger Fault Code: P0198 Posted: 2019-01-28 06:04

Good morning, I'm experiencing a persistent P0198 fault code on my 2010 Dodge Charger with a 5.7L engine. I've already replaced the engine oil temperature (EOT) sensor twice, but the code continues to appear. What could be causing this issue? The P0198 code indicates that the Powertrain Control Module (PCM) has detected an abnormal voltage signal from the Engine Oil Temperature Sensor—specifically, a circuit voltage exceeding the maximum acceptable threshold. I'm wondering if it's possible that the problem lies not with the sensor itself but in the wiring harness, connectors, or grounding. I currently only have a basic scan tool that displays the P0198 code and does not provide real-time oil temperature data or perform circuit diagnostics.

Related fault codes
P0198
Comments (8)
Anonymous 2019-01-28 08:32

P0198 - ENGINE OIL TEMPERATURE SENSOR CIRCUIT HIGH This code means the PCM detects that the engine oil temperature sensor input voltage is above the maximum acceptable level. The issue is likely related to a circuit fault, such as a short to power or an open/shorted signal. Which model year and engine size? A 5.7L V8 is common in Dodge Chargers—this may be relevant. Key point: The code includes 'CIRCUIT' — this suggests wiring or connector issues rather than sensor failure. Did you install a genuine Dodge OEM sensor, or an aftermarket one? Possible causes: - G224: EOT signal circuit shorted to voltage - G224: EOT signal circuit open or high resistance - K900: Sensor ground circuit open or high resistance - Engine Oil Temperature Sensor failure - Powertrain Control Module (PCM) fault (less likely)

Anonymous 2019-01-28 09:01

Aftermarket sensor installed — I suspect this might be the root cause.

Anonymous 2019-01-29 08:02

Please confirm your vehicle's year, engine size, and exact model (e.g., 2010 Dodge Charger 5.7L). This helps narrow down potential causes.

Anonymous 2019-01-29 08:24

Vehicle: 2010 Dodge Charger with a 5.7L V8 engine.

Anonymous 2019-01-29 21:19

The engine oil temperature sensor is typically a thermistor. To properly diagnose, you should use a scan tool capable of reading real-time oil temperature data as a Data PID (Parameter ID). Additionally, a digital multimeter would be helpful to test voltage and resistance at the sensor and at the PCM connector. Given that the sensor has been replaced twice, the issue is likely in the wiring or connectors rather than the sensor itself.

Anonymous 2019-01-30 05:52

Good morning — I only have a basic scan tool that displays P0198 and does not provide live oil temperature readings or diagnostic data.

Anonymous 2019-01-30 07:29

The most likely causes are listed above. While a faulty PCM is possible, it's less common. A visual inspection of the sensor connector, wiring harness, and grounding points is essential. Voltage checks at both the sensor and the PCM should be performed using a digital multimeter to confirm proper signal levels. Without these tests, diagnosing the root cause remains difficult.

Anonymous 2019-01-30 11:47

I don't have access to diagnostic tools or testing equipment — I'll need to find a qualified mechanic in Birmingham, Alabama to perform the inspection and diagnostics. Thank you for your help!