A P0652 code in your 2023 Dodge Durango indicates that the sensor reference voltage A circuit is reading lower than expected. Instead of the normal 5 volts, the circuit is showing reduced voltage. This affects all sensors that rely on this reference, causing widespread sensor reading issues.
What Low Reference Voltage Means
The ECM provides a precise 5-volt reference that sensors use as a baseline for their measurements. When this voltage drops below normal, sensors report proportionally incorrect values. A circuit shorted to ground pulls voltage down, or excessive loading from a failing sensor drains the reference voltage.
Causes of Low Reference Voltage
A short to ground in the reference circuit wiring is the primary cause. One failing sensor may be loading down the entire reference circuit, affecting all sensors. Corroded connections create resistance that drops voltage. The ECM's internal voltage regulator may be weak or partially failed. Water intrusion causing ground paths through connectors is common.
Symptoms in Your Durango
Multiple sensor-related codes may accompany P0652. Engine performance issues including rough running, poor acceleration, and unstable idle are typical. The ECM may enter limp mode with reduced power. The check engine light illuminates, and depending on severity, the engine may run very poorly or barely at all.
Diagnostic Process
Using Chrysler wiTECH, monitor the reference voltage at the ECM output. Disconnect sensors one at a time while monitoring voltage—if voltage rises when a particular sensor is disconnected, that sensor is loading the circuit. Check for shorts in the wiring by measuring resistance to ground with the circuit disconnected. Verify the ECM's voltage regulator is functioning by checking reference voltage at the source.