Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with a part in the car's transmission that helps control the pressure of the fluid. It's like a valve that isn't working right.
The P1842 code indicates that the transmission control module (TCM) has detected a low voltage condition in the circuit of the pressure control solenoid 'B'.
Pressure control solenoids are responsible for regulating the hydraulic pressure in the transmission. The 'B' solenoid is one of several solenoids that manage the pressure to ensure smooth gear shifts. A 'circuit low' condition suggests that the electrical signal to the solenoid is weaker than expected, which could be due to wiring issues, a faulty solenoid, or a problem with the TCM.
• Harsh or erratic shifting
• Transmission slipping
• Illuminated check engine light
• Faulty pressure control solenoid 'B'
• Damaged or corroded wiring or connectors
• Transmission control module (TCM) malfunction
Solenoid: An electromechanical device that controls fluid flow in the transmission.
TCM: Transmission Control Module, which manages transmission operations.
• Check the transmission fluid level and condition.
• Inspect the wiring and connectors for damage or corrosion.
• Test the pressure control solenoid 'B' for proper operation.
• Replace the faulty pressure control solenoid 'B'.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the TCM if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$200 - $600
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly check and maintain transmission fluid levels.
• Inspect wiring and connectors for signs of wear.
• Schedule regular transmission service.
Transmission Issue
• Avoid driving aggressively until the issue is resolved.
• Have the vehicle inspected by a professional mechanic.
Check with the vehicle manufacturer for warranty coverage on transmission components.
This code has been associated with transmission issues in vehicles with high mileage or poor maintenance history.
Moderate – It is advisable to address this issue soon to prevent further transmission damage.
Ignoring transmission issues can lead to unsafe driving conditions and potential legal liabilities.
• Vehicle must be at operating temperature.
• Code may set during specific driving conditions such as highway speeds.
The pressure control solenoid 'B' is located within the transmission valve body.
Q: Can I drive with a P1842 code?
A: It's not recommended to drive for extended periods with this code, as it can lead to further transmission damage.
Q: How do I reset the check engine light after fixing the issue?
A: Use an OBD-II scanner to clear the code after repairs are completed.
High-End · Full-system diagnostics
A full-system bidirectional platform aimed at advanced DIY users and professional diagnostic workflows.
Network faults often require full-system access instead of a generic code reader alone.
View on Amazon
Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
View on Amazon
Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.