Technical Description of OBD-II Trouble Code
The performance of the Transmission Park Position Sensor/Switch B Circuit is too high.
What does that mean?
This is a generic powertrain diagnostic trouble code (DTC) that applies to OBD-II vehicles equipped with a transmission park position switch/sensor. This includes vehicles from various manufacturers such as Dodge, Ford, Toyota, Land Rover, VW, Chevrolet, and others. Although it is a generic code, the specific repair steps may vary depending on the year, make, model, and powertrain configuration of the vehicle.
Trouble code P07BC is one of several codes associated with malfunctions in the Transmission Park Position Sensor/Switch “B” Circuit.
This code indicates that the Powertrain Control Module (PCM) has detected a malfunction that is affecting the operation of the transmission park position sensor/switch “B” circuit. The codes commonly associated with malfunctions in this circuit are P07B8, P07B9, P07BA, P07BB, P07BC, and P07BD. The specific code activated by the PCM and the illumination of the check engine light or service engine soon light depend on the specific situation.
The purpose of the transmission park position sensor/switch “B” circuit is to monitor the status of the transmission. This circuit sends a signal to the PCM when the transmission is in the park position. In many vehicles, this circuit serves as a safety feature to prevent the starter from engaging when the automatic transmission is in gear.
Code P07BC is set by the PCM when it detects high performance in the transmission park position sensor/switch “B” circuit.
What is the severity of this DTC?
The severity of this code varies depending on the specific malfunction, and it may become a safety issue if the starter engages while the vehicle is in gear. Therefore, it requires timely attention.
Photo of a park/neutral position switch:
What are some of the symptoms of the code?
Symptoms of trouble code P07BC may include:
What are some of the common causes of the code?
The causes of code P07BC may include:
What are some P07BC troubleshooting steps?
The first step in troubleshooting any malfunction is to research the Technical Service Bulletins for known issues with the specific vehicle.
Locate all of the components associated with the transmission park position sensor/switch “B” circuit, including the transmission park position sensor/switch, wiring, connectors, and the PCM. Conduct a thorough visual inspection of these components to check for obvious defects such as scraping, rubbing, bare wires, burn spots, corrosion buildup, or damaged pins.
Advanced Steps
The advanced steps are vehicle-specific and require the appropriate advanced equipment to perform accurately. These procedures involve using a digital multimeter and referencing the specific technical references for the vehicle. The voltage requirements will vary based on the specific year, make, and model of the vehicle.
Circuit Checks
The voltage requirements for the transmission park position sensor/switch circuit and its components will vary depending on the specific vehicle and configuration. Refer to the technical data to obtain the correct voltage range and troubleshooting sequence. If a sensor/switch has no voltage output despite receiving the correct voltage input, it is likely internally faulty.
If a power source or ground is absent, continuity testing may be necessary to check the condition of the wiring and connectors. Continuity tests should be performed with the power removed from the circuit, and the normal readings should be 0 ohms of resistance unless specified otherwise by the technical data. Resistance or no continuity indicates faulty wiring or connectors that need to be repaired or replaced.
Common Repairs
We hope that the information in this article has been helpful in addressing the problem with your transmission park position sensor/switch circuit. However, please note that this article is strictly informational, and the specific technical data and service bulletins for your vehicle should always take priority.
