P0816

DTC P0816, sometimes indicated as P081600 is an OBD diagnostic trouble code indicating a generic fault with the vehicle powertrain (i.e. engine and gearbox). This code identifies an error with the causing downshift switch circuit.

This code is caused by a problem with the downshift switch circuit. This can be caused by a wiring issue, a problem with the switch itself, or a problem with the transmission control module.
The best way to fix this code is to find and fix the underlying problem. If it is a wiring issue, then the wiring should be fixed. If it is a problem with the switch itself, then the switch should be replaced. If it is a problem with the transmission control module, then the module should be replaced.

• P0816: Downshift Switch Circuit
• P0816: Downshift Switch Circuit Malfunction
• P0816: Transmission gear selection switch, downshift – circuit
• P0816 00: Transmission gear selection switch, downshift - circuit malfunction