DTC P0038 Dodge
O2-SENSOR 1 2 HEATER CIRCUIT HIGH
O2-SENSOR 1 2 HEATER CIRCUIT HIGH
Description
The primary objective of the Oxygen (O2) Sensor Heater Control is to attain the fastest possible temperature rise, and to control the steady state temperature of the O2 Sensor. A Positive Temperature Coefficient (PTC) element inside the O2 Sensor heats up as current passes through it. This allows the system to enter Closed Loop quickly and meet the OBD II requirements for continuous monitoring and to deliver accurate readings. This is accomplished by the Powertrain Control Module (PCM) sending a Pulse Width Modulated (PWM) current to the O2 Sensors heater element. The PWM duty cycle is calculated, in response to the temperature measurements. The PCM uses the collected information to continually adjust the PWM to achieve a desired steady state temperature target.
Cause and Solution
O2 SENSOR 1 2 HEATER CONTROL CIRCUIT OPEN HIGH RESISTANCEO2 SENSOR 1 2 HEATER GROUND CIRCUIT OPEN HIGH RESISTANCEO2 SENSOR 1 2 HEATER CONTROL CIRCUIT SHORTED TO VOLTAGEO2 SENSOR 1 2POWERTRAIN CONTROL MODULE (PCM)
Video Guide
Diagnostic Info
- DTC Code: P0038
- Brand: Dodge