The P0852: Park/Neutral Switch Input Circuit High refers to a condition where the park/neutral switch input circuit is detecting higher-than-expected voltage. This issue can interfere with the vehicle’s ability to detect the correct gear position, potentially preventing the vehicle from starting or causing shifting issues. This can be caused by a faulty switch, wiring problems, or a malfunctioning transmission control module (TCM).
P0852 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0852: Park/Neutral Switch Input Circuit High |
| Is it serious? | Yes, this can cause starting problems or transmission shifting issues. |
| Possible causes | – High voltage in the park/neutral switch input circuit – Faulty switch or wiring – Faulty transmission control module (TCM) |
| How to diagnose? | – Test the circuit for high voltage – Inspect wiring and connectors – Replace faulty components if needed |
P0852 Meaning
The P0852: Park/Neutral Switch Input Circuit High code indicates that the voltage in the input circuit of the park/neutral switch is higher than the specified range. This can prevent the vehicle from recognizing whether it is in park or neutral, affecting the ability to start the engine or shift gears correctly.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for any additional related codes that may provide more information. | OBD-II Scanner |
| Inspect Park/Neutral Switch | Visually inspect the park/neutral switch for signs of damage, wear, or misalignment. | Flashlight, Safety Gloves |
| Test the Circuit for High Voltage | Use a multimeter to measure the voltage in the park/neutral switch input circuit and ensure it falls within the manufacturer’s specifications. | Multimeter |
| Check Wiring and Connectors | Inspect the wiring and connectors for signs of damage, corrosion, or loose connections that may cause high voltage in the circuit. | Flashlight, Multimeter |
| Replace Faulty Components | If the switch, wiring, or connectors are found faulty, replace the necessary components. | Replacement Parts, Basic Tools |
| Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and take the vehicle for a test drive to ensure proper transmission and gear position detection. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the system to confirm that the P0852 code does not return. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko