P0852 OBD-II Trouble Code: Park / Neutral Switch Input Circuit High

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P0852 code

P0852 is a diagnostic trouble code (DTC) for "Park / Neutral Switch Input Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic for $114.99 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford $114.99 $20.0
Toyota $114.99 $20.0
BMW $124.99 $20.0
SCHEDULE P0852 DIAGNOSTIC Get a fair and transparent estimate upfront

P0852 code definition

The code P0852 indicates that a malfunction was detected within the park/neutral switch input circuit. This code is only found in vehicles with both automatic transmissions and four-wheel-drive capability.

What the P0852 code means

The PCM uses data from the speed sensor, torque converter lock-up solenoid, the transfer case shift sensor, the transmission shift solenoids, and other sensors, to calculate engine RPM, engine timing, fuel delivery, and many other operations. If the data from these sensors indicate that the transmission shifter range is not falling within the set parameters, this code will be stored.

What causes the P0852 code?

In almost every instance, the P0852 code is linked to a transfer case range sensor that is not properly adjusted. However, there may be other causes, including:

  • A defective range sensor.
  • Any open, corroded, shorted, or damaged electrical components, including wiring and connectors.
  • Improperly installed sensor retaining bolts.
  • Corrosion within the sensor connector.

What are the symptoms of the P0852 code?

If the P0852 code is stored, the vehicle owner may observe several other symptoms, including:

  • Failure to engage four-wheel drive.
  • Very harsh shifting.
  • Complete failure to shift.
  • Reduced fuel efficiency.
  • Illumination of the Check Engine light.

How does a mechanic diagnose the P0852 code?

To begin diagnosing the P0852 code, a mechanic must first verify the code with the OBD-II scanner. Then, they will visually inspect all the electrical components, and replace any faulty, open, shorted, or damaged elements. After this repair, and any others, they should clear the PCM and retest the system. This step ensures that the mechanic knows precisely which repair fixed the issue, and does not continue working on a vehicle that has been properly repaired. If the code returns after this step, the mechanic will move on to testing other components of the park/neutral switch until the issue has been discovered.

Common mistakes when diagnosing the P0852 code

Often, after a vehicle has undergone recent transmission repairs, the range sensor will be left improperly adjusted, and only needs a simple tweak to solve the issue. Many technicians report that parts are mistakenly blamed and replaced when this small readjustment was all that was necessary.

How serious is the P0852 code?

The P0852 code directly relates to the safe and proper operation of the vehicle; therefore, it is very important that this issue be repaired immediately. Failure to address this issue when it arises could lead to dangerous driving conditions, or a vehicle that will not operate at all.

What repairs can fix the P0852 code?

There are a few ways that a technician can address a P0852 code detection. They include:

  • Readjustment of an improperly adjusted transfer case range sensor.
  • Replacement of a defective range sensor.
  • Repairing any open, corroded, shorted, or damaged electrical components, including wiring and connectors.
  • Reinstalling an improperly installed sensor retaining bolts.
  • Replacement of a corroded sensor connector.

Need help with a P0852 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

Check Engine Light
trouble codes
P0852

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P0852 code.

SCHEDULE P0852 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(7294)

Rating Summary
6779
246
57
39
173
6779
246
57
39
173
 at YourMechanic

Simon

30 years of experience
8 reviews
Simon
30 years of experience
Honda Element L4-2.4L - Check Engine Light is on Inspection - Albuquerque, New Mexico
Simon was Professional, knowledgeable and patient throughout the entire process. Would highly recommend!
 at YourMechanic

Luke

17 years of experience
134 reviews
Luke
17 years of experience
Chevrolet Equinox L4-2.4L - Check Engine Light is on - Austin, Texas
Luke was friendly and professional. He did a nice job of explaining the issue with my car so that I could understand it.
 at YourMechanic

Chuy

14 years of experience
386 reviews
Chuy
14 years of experience
Toyota Camry L4-2.5L - Check Engine Light is on - Chicago, Illinois
His explained everything very clearly on what I should do next with my car and what the cheapest solutions were.
 at YourMechanic

Jose

12 years of experience
31 reviews
Jose
12 years of experience
Chrysler Pacifica V6-3.8L - Check Engine Light is on - Redlands, California
Very friendly and punctual. Knows what he is talking about. Appreciate Jose working on my car. I would recommend him to customers.


More related articles

Related questions

Engine knock and hesitation

The poor acceleration and misfiring can definitely be tied to the[clogged catalytic converter, but something had to clog the converter. In many cases, oil entering the exhaust or too rich of an air/fuel mixture can overwork the catalytic converter to...

Check Engine Light is on - 2007 Toyota Sienna

This code relates to a heated oxygen sensor which is a unit inside your exhaust system that reads exhaust gases and relays this information to the car's computer. The computer uses this information to make adjustments to fueling. This sensor...

Engine codes detected were P0016 P0017 and P0174.

The codes P0016 (https://www.yourmechanic.com/article/p0016-obd-ii-trouble-code-camshaft-position-a-camshaft-position-correlation-bank-1-by-jay-safford) and P0017 (https://www.yourmechanic.com/article/p0079-obd-ii-trouble-code-crankshaft-position-camshaft-position-correlation-bank-1-sensor-b-by-jay-safford) are related to the crankshaft location and the camshaft location. Check the camshaft position sensor and see if its plugged in. If the wiring harness is in good shape and the wires are...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com