P0852 2017 GMC Sierra Code - Park/Neutral Position Switch Circuit High Voltage
Quick Answer
The transmission manual shift shaft switch assembly, also known as the Internal Mode Switch (IMS), is a sliding contact switch attached to the manual shift shaft inside the transmission case. Common causes include Faulty Transmission Internal Mode Switch (IMS), Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch circuit poor electrical connection. 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
- P0852 2017 GMC Sierra indicates Park/Neutral Position Switch Circuit High Voltage.
- Common causes
- Common causes include Faulty Transmission Internal Mode Switch (IMS), Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch circuit poor electrical connection.
- 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.
Code P0852 2017 GMC Sierra Description
The state of each input is available for display on the scan tool. The five input parameters represented are Signal A, Signal B, Signal C, Signal P (Parity), and Signal N (Park/Neutral Start Signal). Park/Neutral Signal is sent from the Park/Neutral switch directly to the Engine Control Module (ECM) and is used for engine start enable. The Park/Neutral Signal circuit is not connected to the TCM internally; the circuit uses the TCM as a pass-through connector only. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the Park/Neutral switch signal equals 12 V, High, when the IMS reports a Park/Neutral range.
What are the Possible Causes of the DTC P0852 2017 GMC Sierra?
- Faulty Transmission Internal Mode Switch (IMS)
- Transmission Internal Mode Switch harness is open or shorted
- Transmission Internal Mode Switch circuit poor electrical connection
- Faulty Control Solenoid Valve Assembly
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0852 2017 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0852 2017 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0852 2017 GMC Sierra Code
What does the OBDII code P0852 mean for a 2017 GMC Sierra?
P0852 indicates a high voltage issue in the Park/Neutral Position Switch Circuit, which monitors the transmission's gear position.
What are the common symptoms of code P0852 in a 2017 GMC Sierra?
Symptoms may include the inability to start the vehicle, improper shifting, the transmission stuck in a single gear, or the illumination of the check engine light.
What causes the P0852 code in a 2017 GMC Sierra?
Possible causes include a faulty park/neutral position switch, damaged wiring or connectors, a short circuit, or issues with the vehicle's PCM (Powertrain Control Module).
Can a faulty park/neutral position switch cause starting problems?
Yes, a faulty park/neutral position switch can prevent the vehicle from starting as it may not properly communicate the gear position to the PCM.
How can I diagnose the P0852 code on my 2017 GMC Sierra?
Begin by inspecting the wiring and connectors for damage or corrosion, test the park/neutral position switch for proper operation, and use a multimeter to check voltage levels.
Is it safe to drive a 2017 GMC Sierra with a P0852 code?
Driving with this code may cause transmission shifting issues or starting problems, so it’s best to address the issue promptly to avoid further complications.
How can I fix the P0852 code on my 2017 GMC Sierra?
Repairs may include replacing the park/neutral position switch, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.
Can a software update resolve the P0852 code?
In some cases, a software update for the PCM might resolve the issue, but this is only applicable if the problem stems from a programming error.
Is the P0852 code specific to GMC vehicles?
No, the P0852 code is a generic OBDII code that can appear on many makes and models, but the exact cause and repair process may vary by vehicle.
How much does it cost to repair the P0852 code on a 2017 GMC Sierra?
Repair costs depend on the root cause but may range from $100 to $400, including parts and labor, with higher costs if the PCM needs replacement.
Discuss the causes and fixes for P0852 2017 GMC Sierra OBDII Code
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