P0842 Pontiac Code - Transmission Fluid Pressure Sensor/Switch 'A' Circuit Low
Quick Answer
The P0842 diagnostic trouble code (DTC) is specific to Pontiac vehicles and refers to an issue with the Transmission Fluid Pressure Sensor/Switch 'A' Circuit being detected as low. Common causes include Faulty transmission fluid pressure sensor: The sensor itself may be malfunctioning, causing it to provide incorrect readings to the TCM, Wiring issues: Damaged or corroded wiring connecting the sensor to the TCM can result in a low circuit signal, Low transmission fluid level: Insufficient transmission fluid can lead to decreased pressure within the system, triggering the code. 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
- P0842 Pontiac indicates Transmission Fluid Pressure Sensor/Switch 'A' Circuit Low.
- Common causes
- Common causes include Faulty transmission fluid pressure sensor: The sensor itself may be malfunctioning, causing it to provide incorrect readings to the TCM, Wiring issues: Damaged or corroded wiring connecting the sensor to the TCM can result in a low circuit signal, Low transmission fluid level: Insufficient transmission fluid can lead to decreased pressure within the system, triggering the code.
- 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 P0842 Pontiac Description
The P0842 diagnostic trouble code (DTC) is specific to Pontiac vehicles and refers to an issue with the Transmission Fluid Pressure Sensor/Switch 'A' Circuit being detected as low. In automatic transmissions, the transmission fluid pressure sensor is crucial for monitoring and regulating the pressure of the transmission fluid. This sensor provides important data to the vehicle's transmission control module (TCM), allowing it to make necessary adjustments to ensure smooth gear shifts and optimal performance.
Common Causes of P0842 Pontiac
- Faulty transmission fluid pressure sensor: The sensor itself may be malfunctioning, causing it to provide incorrect readings to the TCM.
- Wiring issues: Damaged or corroded wiring connecting the sensor to the TCM can result in a low circuit signal.
- Low transmission fluid level: Insufficient transmission fluid can lead to decreased pressure within the system, triggering the code.
- Transmission fluid contamination: Contaminants in the transmission fluid can affect the sensor's ability to accurately measure pressure.
- Faulty TCM: A malfunctioning TCM can misinterpret sensor data, leading to erroneous pressure readings.
Symptoms of P0842 Pontiac
- Rough or delayed shifting: The vehicle may experience rough or delayed gear shifts, making the driving experience less smooth.
- Transmission slipping: The transmission may slip out of gear or struggle to engage properly, leading to a loss of power or acceleration.
- Overheating transmission: Reduced transmission fluid pressure can cause the transmission to overheat, leading to potential damage to internal components.
- Dashboard warning light: The check engine light may illuminate on the dashboard, indicating a problem with the transmission fluid pressure sensor/switch.
How to Fix P0842 Pontiac
- Diagnose the issue: Use a diagnostic scanner to retrieve the DTC and perform a thorough inspection of the transmission fluid pressure sensor, circuitry, and related components.
- Check transmission fluid level and condition: Ensure the transmission fluid level is adequate and free from contamination. Top up or replace the fluid if necessary.
- Test sensor functionality: Test the transmission fluid pressure sensor to determine if it is providing accurate readings. Replace the sensor if it is found to be faulty.
- Inspect wiring and connectors: Check the wiring connecting the sensor to the TCM for any damage or corrosion. Repair or replace as needed.
- Clear the code: Once the issue has been addressed, clear the DTC using a diagnostic scanner to reset the system and check for any recurring issues.
Cost to Fix P0842 Pontiac
The typical repair costs for addressing a P0842 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, the parts for replacing a transmission fluid pressure sensor can range from $50 to $150, while labor costs can add another $100 to $200. Overall, the total repair cost for this issue may fall between $150 and $350. However, it's important to note that additional costs may be incurred if other components need to be replaced or if further diagnostics are required. Be sure to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on your vehicle's make and model.
Tech Notes for P0842 Pontiac
2001-2005 Pontiac Montana
2001-2005 Pontiac Montana EXT
2001-2005 Pontiac Aztek
2001-2005 Pontiac Aztek AWD
2001-2005 Pontiac Bonneville
2001-2008 Pontiac Grand Prix
2002-2005 Pontiac Montana 4WD
2005-2006 Pontiac Montana SV6 (AWD)
2005-2008 Pontiac Montana SV6
2005-2008 Pontiac Montana SV6 EXT
Pontiac Factory Service Bulletin OBDII Code P0842
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Frequently Asked Questions about P0842 Pontiac Code
1. What does the OBDII code P0842 mean for a Pontiac?
P0842 indicates that the Transmission Fluid Pressure Sensor/Switch 'A' circuit has a low voltage reading, which could affect the transmission's operation.
2. What are the common symptoms of code P0842 on a Pontiac?
Symptoms may include transmission slipping, harsh shifting, delayed gear engagement, or the transmission being stuck in one gear (limp mode).
3. What causes code P0842 on a Pontiac?
Common causes include a faulty transmission fluid pressure sensor, damaged wiring or connectors, low transmission fluid levels, or internal transmission issues.
4. Can driving with code P0842 damage my Pontiac’s transmission?
Yes, continuing to drive with this code can lead to further damage to the transmission if the issue isn’t resolved promptly.
5. How do I diagnose code P0842 on my Pontiac?
Start by checking the transmission fluid level and condition, inspecting wiring and connectors for damage, and testing the transmission fluid pressure sensor.
6. How can I fix code P0842 on my Pontiac?
Repairs may involve replacing the transmission fluid pressure sensor, fixing damaged wiring, or addressing internal transmission problems.
7. Is replacing the transmission fluid pressure sensor a common fix for code P0842?
Yes, replacing the sensor is a common solution if it is determined to be faulty after diagnosis.
8. Can low transmission fluid cause code P0842 on a Pontiac?
Yes, insufficient or dirty transmission fluid can trigger this code by causing incorrect pressure readings.
9. What tools are needed to diagnose code P0842 on a Pontiac?
A diagnostic scanner, multimeter, and possibly a transmission pressure gauge are useful for identifying the issue.
10. How much does it typically cost to repair code P0842 on a Pontiac?
Costs vary depending on the cause, but replacing the transmission fluid pressure sensor can range from $100 to $300, including parts and labor.
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