Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is having trouble understanding the position of the gear shifter. It's like if your game controller's buttons weren't working right.
This code indicates an issue with the digital circuit responsible for detecting the gear selector lever's position, affecting its performance.
The P1823 code is triggered when the transmission control module (TCM) detects a problem with the digital circuit that reads the gear selector lever's position. This could mean the signal is out of range or not performing as expected, possibly due to a fault in the wiring, connectors, or the gear selector itself.
• Check Engine Light is on
• Transmission may not shift correctly
• Vehicle stuck in a single gear
• Faulty gear selector lever
• Damaged wiring or connectors
• Malfunctioning transmission control module (TCM)
Transmission Control Module (TCM): A computer responsible for controlling the transmission's operation.
Gear Selector Lever: The lever used by the driver to select the vehicle's gear.
• Use an OBD-II scanner to confirm the code.
• Inspect the gear selector lever and its wiring for damage.
• Test the transmission control module (TCM) for faults.
• Repair or replace damaged wiring or connectors.
• Replace faulty gear selector lever.
• Reprogram or replace the transmission control module (TCM) if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
$150 - $500
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect the gear selector lever and wiring.
• Keep the transmission control module updated.
• Avoid harsh shifting or forcing the gear lever.
Sensor Issue
• Avoid driving the vehicle until the issue is resolved to prevent further damage.
• Consult with a professional mechanic for accurate diagnosis and repair.
Check with your vehicle manufacturer for warranty coverage on transmission components.
The P1823 code has been associated with electronic transmission systems in vehicles since the introduction of digital gear selectors.
Moderate – It is advisable to address this issue soon to avoid potential transmission damage.
Driving with a malfunctioning gear selector can lead to unsafe driving conditions. Always ensure repairs are performed by a qualified technician.
• Vehicle in park or neutral
• Engine running and warmed up
The gear selector lever is typically located between the driver and passenger seats or on the steering column.
Q: Can I drive with a P1823 code?
A: It's not recommended, as it can lead to unsafe driving conditions and further transmission damage.
Q: How can I reset the P1823 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue persists, further diagnosis is needed.
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