P0843 2015 GMC Sierra Code - Transmission Fluid Pressure Switch 1 Circuit High Voltage
Quick Answer
The P0843 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates an issue with the Transmission Fluid Pressure Switch 1 Circuit High Voltage. Common causes include Faulty transmission fluid pressure switch: The pressure switch itself may be malfunctioning, sending incorrect signals to the transmission control module, Wiring issues: Damaged or corroded wiring connections to the pressure switch can cause high voltage readings, Transmission control module malfunction: A fault in the transmission control module can result in erroneous pressure readings. 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 2015 GMC Sierra indicates Transmission Fluid Pressure Switch 1 Circuit High Voltage.
- Common causes
- Common causes include Faulty transmission fluid pressure switch: The pressure switch itself may be malfunctioning, sending incorrect signals to the transmission control module, Wiring issues: Damaged or corroded wiring connections to the pressure switch can cause high voltage readings, Transmission control module malfunction: A fault in the transmission control module can result in erroneous pressure readings.
- 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.
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Code P0843 2015 GMC Sierra Description
The P0843 diagnostic trouble code (DTC) for a 2015 GMC Sierra indicates an issue with the Transmission Fluid Pressure Switch 1 Circuit High Voltage. This code is specifically related to the transmission system of the vehicle. The transmission fluid pressure switch is responsible for monitoring the hydraulic pressure within the transmission. When the switch detects a high voltage signal, it means that the pressure in the transmission is higher than expected. This can lead to various issues with the transmission system, affecting the vehicle's performance and drivability.
Common Causes of P0843 2015 GMC Sierra
- Faulty transmission fluid pressure switch: The pressure switch itself may be malfunctioning, sending incorrect signals to the transmission control module.
- Wiring issues: Damaged or corroded wiring connections to the pressure switch can cause high voltage readings.
- Transmission control module malfunction: A fault in the transmission control module can result in erroneous pressure readings.
- Low transmission fluid level: Insufficient transmission fluid can lead to increased pressure within the transmission system.
Symptoms of P0843 2015 GMC Sierra
- Harsh or delayed shifting: The transmission may exhibit harsh or delayed shifting between gears, affecting the vehicle's acceleration and overall performance.
- Transmission slipping: The transmission may slip out of gear or struggle to maintain the correct gear, leading to erratic driving behavior.
- Transmission overheating: The transmission may overheat due to the increased pressure, causing potential damage to internal components.
- Illuminated warning light: The check engine light may illuminate on the dashboard, indicating a fault in the transmission system.
How to Fix P0843 2015 GMC Sierra
- Diagnose the issue: Use a scan tool to retrieve the DTC and perform a thorough inspection of the transmission fluid pressure switch and related components.
- Replace the transmission fluid pressure switch: If the switch is found to be faulty, replace it with a new, OEM-quality part.
- Check and repair wiring: Inspect the wiring harness for any damage or corrosion, repairing or replacing any affected wires.
- Test transmission operation: After repairs are completed, test drive the vehicle to ensure that the transmission is functioning properly.
- Clear the DTC: Use a scan tool to clear the DTC from the vehicle's memory to reset the check engine light.
Cost to Fix P0843 2015 GMC Sierra
The typical repair costs for addressing a P0843 code on a 2015 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of replacing the transmission fluid pressure switch and addressing any wiring issues can range from $200 to $500, including parts and labor. Additional costs may apply if the transmission control module needs to be replaced or if there are other underlying issues contributing to the high voltage reading. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the specific circumstances of the vehicle. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and other factors.
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Frequently Asked Questions about P0843 2015 GMC Sierra Code
1. What does the OBDII code P0843 mean on a 2015 GMC Sierra?
P0843 indicates "Transmission Fluid Pressure Switch 1 Circuit High Voltage," which means the powertrain control module (PCM) has detected an abnormally high voltage signal from the transmission fluid pressure switch.
2. What are the common symptoms of code P0843 on a 2015 GMC Sierra?
Symptoms may include erratic shifting, the transmission being stuck in one gear, failure to engage certain gears, reduced fuel efficiency, and the check engine light being illuminated.
3. What causes P0843 on a 2015 GMC Sierra?
Common causes include a faulty transmission fluid pressure sensor, damaged or corroded wiring or connectors, a malfunctioning PCM, or low or contaminated transmission fluid.
4. Can driving with code P0843 damage my 2015 GMC Sierra?
Yes, driving with this code can cause further damage to the transmission due to improper fluid pressure regulation and erratic shifting. It's best to address the issue promptly.
5. How do I diagnose code P0843 on a 2015 GMC Sierra?
Start by inspecting the transmission fluid level and condition, checking the wiring and connectors for damage or corrosion, and testing the transmission fluid pressure sensor for proper operation.
6. Can low transmission fluid cause P0843 on a 2015 GMC Sierra?
Yes, low or contaminated transmission fluid can lead to abnormal pressure readings, triggering the P0843 code.
7. How do I fix code P0843 on a 2015 GMC Sierra?
Repairs may include replacing a faulty transmission fluid pressure sensor, repairing or replacing damaged wiring or connectors, or performing a transmission fluid flush and refill.
8. How much does it cost to fix code P0843 on a 2015 GMC Sierra?
Repair costs vary, but replacing a transmission fluid pressure sensor typically costs between $150 and $300, including labor. Additional repairs may increase the cost.
9. Can a faulty PCM cause code P0843 on a 2015 GMC Sierra?
While less common, a malfunctioning PCM could cause the code if it sends or interprets incorrect voltage signals from the pressure sensor.
10. Do I need to reprogram the PCM after fixing code P0843 on a 2015 GMC Sierra?
In most cases, reprogramming the PCM is unnecessary. However, clearing the code with a scan tool and performing a test drive to ensure the issue is resolved is recommended.
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