Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer has detected a problem with a part that helps control the pressure in the transmission. It's like a helper that isn't doing its job right.
The P1843 code is triggered when the transmission control module detects a low voltage or resistance issue in the circuit of the pressure control solenoid 'C'.
The pressure control solenoid 'C' is responsible for regulating hydraulic pressure in the transmission. A low circuit condition indicates that the solenoid may not be receiving the correct voltage or there is a problem with the wiring or connectors.
• Transmission slipping
• Harsh or delayed shifting
• Check Engine Light illuminated
• Faulty pressure control solenoid 'C'
• Wiring issues such as shorts or open circuits
• Poor electrical connections in the solenoid circuit
Solenoid: An electromechanical device that controls fluid flow in the transmission.
Circuit: A complete path that allows electrical current to flow.
• Use an OBD-II scanner to confirm the code.
• Inspect the wiring and connectors for damage or corrosion.
• Test the solenoid for proper resistance and operation.
• Repair or replace damaged wiring or connectors.
• Replace the faulty pressure control solenoid 'C'.
• Clear the code and test drive the vehicle to ensure the issue is resolved.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regular transmission fluid changes
• Inspect wiring for damage during routine maintenance
• Ensure proper electrical connections
Transmission Control Issue
• Avoid driving the vehicle until repaired to prevent further damage.
• Consult a professional mechanic for diagnosis and repair.
Check with your vehicle manufacturer for specific warranty coverage on transmission components.
This code has been associated with transmission issues in vehicles with electronic control systems since the late 1990s.
Moderate – Addressing this issue promptly can prevent further transmission damage.
Driving with a malfunctioning transmission can be unsafe and lead to further mechanical failure.
• Vehicle at operating temperature
• Transmission in gear
The pressure control solenoid is located inside the transmission, often accessible by removing the transmission pan.
Q: Can I drive with a P1843 code?
A: It's not recommended to drive with this code as it can lead to further transmission damage.
Q: How do I clear a P1843 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is resolved, it should not return.
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