P0851 Jeep Code - Park/Neutral Position Switch Circuit Low Voltage
Quick Answer
The P0851 diagnostic trouble code for Jeep vehicles refers to the Park/Neutral Position Switch Circuit Low Voltage. Common causes include Faulty park/neutral position switch, Damaged wiring or connectors in the circuit, Corrosion or moisture in the switch or circuit. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0851 Jeep indicates Park/Neutral Position Switch Circuit Low Voltage.
- Common causes
- Common causes include Faulty park/neutral position switch, Damaged wiring or connectors in the circuit, Corrosion or moisture in the switch or circuit.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P0851 Jeep Description
The P0851 diagnostic trouble code for Jeep vehicles refers to the Park/Neutral Position Switch Circuit Low Voltage. This code indicates that there is a problem with the circuit that controls the transmission range sensor, which is responsible for detecting the position of the gear selector. The park/neutral position switch is crucial for ensuring the vehicle starts only in park or neutral, and it also helps the transmission control module (TCM) determine the appropriate shift points based on the gear selected. When this circuit detects low voltage, it can lead to issues with starting the vehicle, incorrect shifting, or even prevent the vehicle from moving altogether. Ignoring this code can result in further damage to the transmission system and potentially compromise the vehicle's safety and drivability.
Common Causes of P0851 Jeep
- Faulty park/neutral position switch
- Damaged wiring or connectors in the circuit
- Corrosion or moisture in the switch or circuit
- Malfunctioning transmission control module (TCM)
- Electrical issues such as a blown fuse or relay related to the circuit
Symptoms of P0851 Jeep
- Difficulty starting the vehicle
- Inability to shift gears or shifting into the wrong gear
- Check Engine Light illuminated on the dashboard
- Transmission slipping or erratic shifting behavior
- Vehicle not moving when the gear selector is engaged
How to Fix P0851 Jeep
- Begin by diagnosing the issue using a scan tool to confirm the P0851 code and pinpoint the specific cause.
- Inspect the park/neutral position switch and its wiring for any damage, corrosion, or loose connections.
- Test the switch for proper functionality and voltage output.
- Replace the park/neutral position switch if it is found to be faulty.
- Clear the trouble code from the vehicle's computer system and perform a test drive to ensure proper operation of the transmission.
Cost to Fix P0851 Jeep
The cost of repairing a P0851 code in a Jeep vehicle can vary depending on the specific cause of the issue and the labor rates in your area. Typically, the cost of parts such as a new park/neutral position switch can range from $50 to $150. Labor rates at auto repair shops may vary between $80 and $150 per hour, so the total cost of the repair could be anywhere from $150 to $400 or more. It's recommended to consult with a trusted mechanic or dealership for a more accurate estimate based on your vehicle's make and model.
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