P0859 - DTC P0859 - Transmission Range Sensor Circuit Range/Performance Problem - Common in Ford and Chrysler Models

Quick Answer

P0859 means: P0859 indicates a malfunction in the transmission range sensor circuit.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with P0859? Address immediately to avoid transmission failure.

Common Questions

What does P0859 mean and how does it affect my car?

The P0859 code indicates an issue with your vehicle's transmission range sensor, which can lead to difficulty in shifting gears. If left unresolved, it may cause significant performance issues and even potential transmission failure.

What are the most common causes of P0859 and how much does it cost to fix?

Common causes of P0859 include a faulty transmission range sensor, wiring issues, and problems with the transmission control module. Repair costs typically range from $150 to $800, depending on the severity of the issue.

Can I drive my car with P0859 or should I stop immediately?

While you may be able to drive with a P0859 code, it's not advisable. Ignoring this code could lead to more severe transmission problems, potentially leaving you stranded or facing costly repairs.

How can I diagnose P0859 myself using GeekOBD APP?

To diagnose P0859 using the GeekOBD APP, connect the device to your vehicle's OBD2 port, run a scan to retrieve the codes, and analyze any freeze frame data to understand driving conditions when the fault occurred.

What vehicles are most commonly affected by P0859?

Vehicles such as the 2011 Ford F-150, 2014 Chrysler 300, and several models from Dodge and Jeep are frequently affected by the P0859 code, particularly those produced between 2005 and 2018.

How can I prevent P0859 from happening again?

Regular maintenance, including fluid changes and wiring inspections, can help prevent P0859. Ensure that your vehicle's transmission fluid is at the correct level and that connections are kept clean and free of corrosion.

What is P0859?

The DTC code P0859 refers to a problem with the transmission range sensor circuit, specifically indicating a range or performance issue. In simpler terms, this sensor tells the vehicle's onboard computer where the transmission is positioned, whether that's in park, reverse, neutral, or drive. When the computer detects that the sensor is not performing correctly, it triggers the P0859 code. This can lead to serious issues with shifting, making it difficult for your vehicle to transition between gears smoothly. Commonly seen in models like the 2011 Ford F-150 or the 2014 Chrysler 300, the P0859 code can manifest in various ways, including erratic shifting or the inability to shift at all. Without addressing this code promptly, you risk worsening transmission problems that could lead to costly repairs or even complete transmission failure. It's crucial to understand that while the P0859 code may not always indicate an immediate danger, it should not be ignored, as it can degrade overall vehicle performance and fuel efficiency over time. Proper diagnostic steps and repairs can often resolve the issue and prevent more extensive damage.

System: P - Powertrain (Engine, Transmission, Emissions)

Symptoms

Common symptoms when P0859 is present:

Check engine light remains illuminated, indicating a persistent issue that requires attention.
Transmission may hesitate or fail to engage properly, leading to a jerky driving experience.
Unusual gear shifting patterns that could result in unexpected acceleration or deceleration.
Reduced fuel efficiency, often noticeable as the vehicle struggles to find the right gear.
Inability to shift into certain gears, which can be particularly problematic when trying to reverse or accelerate.

Possible Causes

Most common causes of P0859 (ordered by frequency):

Faulty transmission range sensor (60% likelihood) - This is often the primary culprit, where the sensor fails to send the correct signals to the computer.
Wiring issues (25% likelihood) - Damaged or corroded wiring can disrupt the connection between the sensor and the vehicle's computer.
Transmission control module problems (10% likelihood) - In rare cases, the issue may stem from a malfunctioning control module that misinterprets sensor data.
Fluid leaks (4% likelihood) - Low transmission fluid levels can affect overall performance and lead to sensor errors.
Mechanical transmission issues (1% likelihood) - Less common, but worn components within the transmission can trigger a range sensor malfunction.

P0859 Repair Costs

Cost Breakdown by Repair Type

Transmission Range Sensor Replacement

Replacing the faulty transmission range sensor is a common and effective repair.

Total: $150 - $300
Success rate: 90%

Wiring Repair

Repairing or replacing damaged wiring that connects the sensor to the vehicle's computer.

Total: $100 - $250
Success rate: 80%

Transmission Control Module Reprogramming

In cases where the module is malfunctioning, reprogramming or replacement may be required.

Total: $200 - $800
Success rate: 70%

Money-Saving Tips for P0859

Start with the most common and least expensive repairs first
Use GeekOBD APP to confirm diagnosis before replacing expensive parts
Consider preventive maintenance to avoid future occurrences
Compare prices for OEM vs aftermarket parts based on your needs
Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional P0859 Diagnosis Process

Follow these systematic steps to accurately diagnose P0859. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for any obvious signs like damaged wiring, loose connections, or corrosion, which could take around 5-10 minutes

Step 1: Initial visual inspection - Check for any obvious signs like damaged wiring, loose connections, or corrosion, which could take around 5-10 minutes.