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 there's a problem with the part of the car that helps control how the wheels work. It's like when a remote control's button is stuck or not working right.
The P1815 code is triggered when the vehicle's computer detects a low voltage signal from the wheel plus switch circuit, indicating a potential malfunction.
The P1815 code indicates that the transmission control module (TCM) has detected a low voltage condition in the wheel plus switch circuit. This switch is part of the vehicle's system that manages wheel and transmission settings for optimal performance.
• Check Engine Light is on
• Transmission may not shift properly
• Unusual noise from the transmission
• Faulty wheel plus switch
• Damaged wiring or connectors
• Faulty transmission control module (TCM)
OBD-II: On-Board Diagnostics, a standardized system for self-diagnostics and reporting.
TCM: Transmission Control Module, the computer that controls the transmission.
• Use an OBD-II scanner to confirm the code.
• Inspect the wheel plus switch and its wiring for damage.
• Test the voltage and continuity of the switch circuit.
• Replace the faulty wheel plus switch.
• Repair or replace damaged wiring or connectors.
• Replace the transmission control module if necessary.
• OBD-II scanner
• Multimeter
• Screwdriver set
$150 - $500
Moderate
• Nissan Altima
• Infiniti G35
• Nissan Maxima
• Regular maintenance checks
• Ensure wiring is intact and not exposed
• Avoid harsh driving conditions
Sensor Issue
• Have the vehicle inspected by a professional.
• Avoid driving in harsh conditions until repaired.
Repairs may be covered under the powertrain warranty if the vehicle is still under warranty.
This code has been commonly reported in vehicles with electronic transmission control issues.
Moderate – It should be addressed soon to avoid potential transmission damage.
Ignoring this code may lead to unsafe driving conditions and potential legal liabilities.
• Vehicle at operating temperature
• Transmission in neutral or park
The wheel plus switch is typically located near the transmission or within the steering column.
Q: Can I drive with a P1815 code?
A: It's not recommended to drive for long periods with this code, as it may cause further transmission issues.
Q: How can I reset the P1815 code?
A: The code can be reset using an OBD-II scanner, but it will likely return if the underlying issue is not fixed.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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