P1841 2014 GMC Sierra Code - Internal Mode Switch 'S' Circuit High Voltage
Quick Answer
The internal mode switch indicates the Transmission Control Module (TCM) which gear position the vehicle operator has selected. Common causes include Faulty Transmission Internal Mode Switch, 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
- P1841 2014 GMC Sierra indicates Internal Mode Switch 'S' Circuit High Voltage.
- Common causes
- Common causes include Faulty Transmission Internal Mode Switch, 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 P1841 2014 GMC Sierra Description
What are the Possible Causes of the DTC P1841 2014 GMC Sierra?
- Faulty Transmission Internal Mode Switch
- Transmission Internal Mode Switch harness is open or shorted
- Transmission Internal Mode Switch circuit poor electrical connection
- Faulty Transmission Control Module (TCM)
How to Fix the DTC P1841 2014 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 P1841 2014 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.
Need more information about the P1841 2014 GMC Sierra code?
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Frequently Asked Questions about P1841 2014 GMC Sierra Code
1. What does the OBDII code P1841 mean on a 2014 GMC Sierra?
P1841 indicates a problem with the Internal Mode Switch (IMS) 'S' Circuit, specifically that the circuit is experiencing high voltage.
2. What are the common symptoms of code P1841 in a 2014 GMC Sierra?
Common symptoms include erratic shifting, the transmission staying in the wrong gear, a check engine light, or reduced vehicle performance.
3. What causes the P1841 code to appear?
The code can be triggered by a faulty Internal Mode Switch, damaged wiring or connectors in the IMS circuit, or issues with the Transmission Control Module (TCM).
4. Can I drive my 2014 GMC Sierra with a P1841 code?
While the vehicle may still drive, it could experience poor transmission performance or shifting issues, potentially causing further damage if not addressed promptly.
5. How is the P1841 code diagnosed?
A mechanic typically uses a scan tool to confirm the code, inspects the wiring and connections leading to the Internal Mode Switch, and tests the switch and TCM for proper operation.
6. What repairs can fix the P1841 code?
Repairs may involve replacing the Internal Mode Switch, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the TCM.
7. How much does it cost to fix a P1841 code on a 2014 GMC Sierra?
Repair costs can vary but generally range from $150 to $500, depending on whether the issue lies with the switch, wiring, or TCM.
8. Can a low battery cause the P1841 code?
While uncommon, low voltage or inconsistent power supply can sometimes affect the TCM, potentially contributing to the issue.
9. Is the Internal Mode Switch the same as the gear position sensor?
Yes, the Internal Mode Switch is part of the transmission that detects the selected gear position and communicates it to the TCM.
10. What tools are needed to troubleshoot the P1841 code?
Diagnosing this code typically requires an OBDII scan tool, a multimeter for testing voltage, and possibly a service manual for wiring diagrams.
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