P0851 Dodge Code - Park/Neutral Position Switch Circuit Low Voltage
Quick Answer
The P0851 diagnostic trouble code (DTC) for Dodge vehicles indicates an issue with the Park/Neutral Position (PNP) switch circuit having a low voltage. Common causes include Faulty Park/Neutral Position (PNP) switch, Wiring issues or damaged connectors in the PNP switch circuit, Corrosion or poor electrical connections in the 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 Dodge indicates Park/Neutral Position Switch Circuit Low Voltage.
- Common causes
- Common causes include Faulty Park/Neutral Position (PNP) switch, Wiring issues or damaged connectors in the PNP switch circuit, Corrosion or poor electrical connections in the 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0851 Dodge Description
The P0851 diagnostic trouble code (DTC) for Dodge vehicles indicates an issue with the Park/Neutral Position (PNP) switch circuit having a low voltage. The PNP switch, also known as the transmission range sensor, plays a crucial role in the proper functioning of the vehicle's transmission system. This switch is responsible for informing the engine control module (ECM) about the gear position (Park, Neutral, Drive, Reverse) selected by the driver. When the PNP switch circuit detects a low voltage signal, it means that there is a problem with the electrical connection or the switch itself.
Common Causes of P0851 Dodge
- Faulty Park/Neutral Position (PNP) switch
- Wiring issues or damaged connectors in the PNP switch circuit
- Corrosion or poor electrical connections in the circuit
- ECM software or hardware problems
- Transmission fluid contamination affecting the switch
Symptoms of P0851 Dodge
- Difficulty starting the vehicle
- Inability to shift gears properly
- Harsh or delayed transmission shifts
- Illumination of the Check Engine Light
- Vehicle may not start in Park or Neutral
How to Fix P0851 Dodge
- Perform a thorough inspection of the PNP switch and its wiring for any visible damage or corrosion.
- Test the PNP switch using a multimeter to check for proper voltage signals in different gear positions.
- Replace the PNP switch if it fails the voltage test or shows signs of wear.
- Repair or replace any damaged wiring or connectors in the PNP switch circuit.
- Clear the DTC with a diagnostic scan tool and test drive the vehicle to ensure the issue is resolved.
Cost to Fix P0851 Dodge
The cost of repairing a P0851 DTC on a Dodge vehicle can vary depending on the specific model, the extent of the damage, and the labor rates in your area. On average, replacing a Park/Neutral Position switch can range from $150 to $300, including parts and labor. However, additional costs may apply if there are other underlying issues that need to be addressed. It is recommended to consult with a qualified mechanic or dealership to get an accurate estimate for your particular situation.
Need more information about the P0851 Dodge code?
Need more information on how to fix the P0851 Dodge code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0851 Dodge code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0851 Dodge Code
1. What does the OBDII code P0851 mean for a Dodge vehicle?
P0851 indicates that the Powertrain Control Module (PCM) has detected a low voltage signal from the Park/Neutral Position Switch Circuit.
2. What are the common symptoms of the P0851 code in a Dodge?
Symptoms may include the inability to start the vehicle, the transmission stuck in one gear, erratic gear shifting, and the Check Engine Light being illuminated.
3. What causes the P0851 code in a Dodge?
Common causes include a faulty Park/Neutral Position (PNP) switch, damaged wiring or connectors in the circuit, a malfunctioning PCM, or low battery voltage.
4. Can a bad battery cause the P0851 code in a Dodge?
Yes, a weak or failing battery can result in low voltage in the circuit and trigger the P0851 code.
5. How do you diagnose the P0851 code in a Dodge?
Diagnosis typically involves checking the PNP switch for proper operation, inspecting the wiring and connectors for damage or corrosion, and verifying the battery voltage and ground connections.
6. Can I drive my Dodge with the P0851 code active?
Driving with the P0851 code is not recommended, as it may cause transmission performance issues or prevent the vehicle from starting.
7. How do you fix the P0851 code in a Dodge?
Repairs may include replacing the Park/Neutral Position switch, repairing or replacing damaged wiring or connectors, and ensuring the battery is fully charged and in good condition.
8. How much does it cost to fix the P0851 code in a Dodge?
Repair costs can vary but typically range from $50 to $200 for parts and labor, depending on whether the PNP switch or wiring needs replacement.
9. Can a faulty PCM cause the P0851 code in a Dodge?
While rare, a malfunctioning PCM can cause this code if it fails to process the Park/Neutral Position switch signal correctly.
10. Is a reset necessary after fixing the P0851 code in a Dodge?
Yes, after repairs are completed, the code should be cleared using an OBDII scanner, and the vehicle should be test-driven to confirm the issue is resolved.
Discuss the causes and fixes for P0851 Dodge OBDII Code
Code P0851 Dodge comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.