P0843 2014 GMC Sierra Code - Transmission Fluid Pressure Switch 1 Circuit High Voltage
Quick Answer
The Transmission Fluid Pressure (TFP) switch 1 is part of the control solenoid valve assembly, which has no serviceable parts. Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve Assembly. 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
- P0843 2014 GMC Sierra indicates Transmission Fluid Pressure Switch 1 Circuit High Voltage.
- Common causes
- Common causes include Low transmission fluid level, Dirty transmission fluid, Faulty Transmission Control Solenoid Valve Assembly.
- 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 P0843 2014 GMC Sierra Description
What are the Possible Causes of the DTC P0843 2014 GMC Sierra?
- Low transmission fluid level
- Dirty transmission fluid
- Faulty Transmission Control Solenoid Valve Assembly
- Transmission Control Solenoid Valve Assembly harness is open or shorted
- Transmission Control Solenoid Valve Assembly circuit poor electrical connection
How to Fix the DTC P0843 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 P0843 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 P0843 2014 GMC Sierra code?
Need more information on how to fix the P0843 2014 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0843 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0843 2014 GMC Sierra Code
1. What does the OBDII code P0843 mean on a 2014 GMC Sierra?
P0843 indicates a high voltage issue in the Transmission Fluid Pressure Switch 1 Circuit, which monitors hydraulic pressure in the transmission.
2. What are common symptoms of the P0843 code on a 2014 GMC Sierra?
Symptoms may include harsh or erratic shifting, the transmission going into limp mode, reduced fuel economy, or the illumination of the check engine light.
3. What causes the P0843 code to appear?
Common causes include a faulty transmission fluid pressure switch, damaged wiring or connectors, low transmission fluid levels, or a malfunctioning transmission control module (TCM).
4. Can low transmission fluid trigger the P0843 code?
Yes, insufficient transmission fluid can cause erratic pressure readings and lead to the P0843 code being set.
5. How do you diagnose the P0843 code?
Diagnosis involves checking the transmission fluid level and condition, inspecting the wiring and connectors for damage, testing the pressure switch for proper function, and scanning the TCM for related trouble codes.
6. Is it safe to drive with the P0843 code on a 2014 GMC Sierra?
Driving with the P0843 code is not recommended, as it can lead to further transmission damage and unsafe driving conditions due to erratic shifting.
7. How much does it typically cost to fix the P0843 code?
Repair costs can range from $150 to $500, depending on whether the issue is with the pressure switch, wiring, or other components.
8. Can a software update fix the P0843 code?
In some cases, a TCM software update from a dealership may resolve the issue if it’s caused by a programming glitch.
9. How do you reset the P0843 code after repairs?
After repairing the underlying issue, the code can be cleared using an OBDII scanner or by disconnecting the battery for a few minutes.
10. Does the P0843 code always mean the pressure switch is faulty?
No, the code could also be caused by wiring issues, poor electrical connections, or problems with the TCM. Proper diagnosis is essential.
Discuss the causes and fixes for P0843 2014 GMC Sierra OBDII Code
Code P0843 2014 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
