P1842 GMC Code - 1-2 Shift Solenoid Circuit Low Input Voltage
Quick Answer
The P1842 GMC trouble code indicates that there is a low input voltage detected in the 1-2 shift solenoid circuit of the vehicle. Common causes include Faulty 1-2 shift solenoid, Damaged or corroded wiring/connectors in the shift solenoid circuit, Issues with the transmission control module. 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
- P1842 GMC indicates 1-2 Shift Solenoid Circuit Low Input Voltage.
- Common causes
- Common causes include Faulty 1-2 shift solenoid, Damaged or corroded wiring/connectors in the shift solenoid circuit, Issues with the transmission control module.
- 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 P1842 GMC Description
The P1842 GMC trouble code indicates that there is a low input voltage detected in the 1-2 shift solenoid circuit of the vehicle. The shift solenoid is a crucial component of the transmission system that helps regulate the flow of transmission fluid to control gear shifting. When the input voltage to the 1-2 shift solenoid is lower than the specified range, it can lead to issues with shifting gears smoothly and efficiently.
Common Causes of P1842 GMC
- Faulty 1-2 shift solenoid
- Damaged or corroded wiring/connectors in the shift solenoid circuit
- Issues with the transmission control module
- Low transmission fluid levels or dirty transmission fluid
- Electrical problems such as a blown fuse or relay related to the shift solenoid circuit
Symptoms of P1842 GMC
- Harsh shifting between gears
- Delayed shifting or difficulty shifting gears
- Transmission slipping
- Transmission getting stuck in a specific gear
- Illumination of the Check Engine Light
How to Fix P1842 GMC
- Begin by diagnosing the specific cause of the low input voltage in the 1-2 shift solenoid circuit using a diagnostic scanner.
- Inspect the wiring and connectors in the shift solenoid circuit for any damage or corrosion, repairing or replacing them as needed.
- Test the 1-2 shift solenoid for proper functionality and replace it if found to be faulty.
- Check the transmission control module for any issues and reprogram or replace it if necessary.
- Finally, clear the trouble code from the vehicle's computer system and test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P1842 GMC
The typical repair costs for addressing a P1842 GMC trouble code can vary depending on the specific cause of the issue. On average, the parts for repairing or replacing a shift solenoid can range from $50 to $200, while labor costs can range from $100 to $300. Overall, the total cost for resolving this issue could be between $150 and $500. However, it's essential to note that these are rough estimates, and actual costs may vary based on factors such as the location of the auto repair shop, the make and model of the vehicle, and the type of engine. It's recommended to seek multiple quotes from different shops to get a more accurate cost estimate.
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