P0850 2017 GMC Sierra Code - Park/Neutral Position Switch Circuit
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
- P0850 2017 GMC Sierra indicates Park/Neutral Position Switch Circuit.
- 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 P0850 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 0 V, Low, when the IMS reports a Drive range.
What are the Possible Causes of the DTC P0850 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 P0850 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 P0850 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 P0850 2017 GMC Sierra Code
1. What does the OBDII code P0850 mean for a 2017 GMC Sierra?
P0850 indicates an issue with the Park/Neutral Position Switch Circuit, which monitors the transmission's gear position to ensure proper vehicle operation.
2. What are the common symptoms of a P0850 code in a 2017 GMC Sierra?
Symptoms may include difficulty starting the engine, the transmission not shifting correctly, or the Check Engine Light turning on.
3. What causes the P0850 code to appear in a 2017 GMC Sierra?
Common causes include a faulty Park/Neutral Position (PNP) switch, damaged wiring or connectors, or issues with the transmission control module.
4. Can I drive my 2017 GMC Sierra with a P0850 code?
It’s not recommended, as the issue may affect transmission function or prevent the vehicle from starting properly.
5. How can a P0850 code be diagnosed in a 2017 GMC Sierra?
A mechanic can use a scan tool to read the code, inspect the PNP switch, test the wiring for continuity, and check for any damaged connectors or transmission module issues.
6. How do I fix the P0850 code on a 2017 GMC Sierra?
Repairs may involve replacing the faulty PNP switch, repairing damaged wiring or connectors, or reprogramming or replacing the transmission control module.
7. How much does it cost to fix a P0850 code in a 2017 GMC Sierra?
Repair costs can vary, but replacing a PNP switch typically costs $150-$300, including parts and labor.
8. Is the P0850 code related to the transmission in a 2017 GMC Sierra?
Yes, the P0850 code is directly related to the transmission, as it involves the Park/Neutral Position Switch, which monitors gear position.
9. Can a dead battery cause a P0850 code in a 2017 GMC Sierra?
While unlikely, electrical issues such as a weak or dead battery can sometimes contribute to communication errors, which might trigger related codes.
10. Should I reset the P0850 code if it appears on my 2017 GMC Sierra?
The code should only be cleared after diagnosing and repairing the underlying issue to prevent further damage or safety concerns.
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