Faulty or worn performance selector switch (internal contacts dirty, stuck or broken); Damaged, chafed or corroded wiring to the switch (open circuit or short to earth or voltage); Loose, corroded or contaminated connector at the switch or control module; Liquid spill or moisture damage in the switch or console area; Fault in the transmission or powertrain control module input circuit; Outdated control module software where the manufacturer has a known fix for the model.

P1801

Performance Selector Switch Failure.

Chevrolet
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
8: AreaTransmission
01: FaultThe specific fault in that area

What it means

On Chevrolet vehicles P1801 means the control module has detected a fault in the performance selector switch circuit, the driver-operated switch that chooses between transmission shift modes such as normal, performance or economy. The module saw a signal from the switch that was open, shorted, stuck or out of step with what it expected. The exact switch location and shift modes vary by model and transmission, so check the manufacturer data for the vehicle.

Symptoms

Check engine light or transmission warning light on
Shift mode button or switch does not change the shift behaviour
Transmission stuck in one shift mode, often the default one
Harsher, later or earlier shifts than normal
Intermittent loss of the selected mode after turning the ignition off and on

Possible causes

Faulty or worn performance selector switch (internal contacts dirty, stuck or broken)likely
Damaged, chafed or corroded wiring to the switch (open circuit or short to earth or voltage)likely
Loose, corroded or contaminated connector at the switch or control modulelikely
Liquid spill or moisture damage in the switch or console areapossible
Fault in the transmission or powertrain control module input circuitrare
Outdated control module software where the manufacturer has a known fix for the modelrare

How to diagnose

Read all stored and pending codes and record the freeze frame data, noting whether the fault is current or intermittent
Operate the shift mode switch and see whether the transmission or dashboard indication responds in each position
Inspect the switch, its connector and the surrounding console for damage, spills, moisture or corrosion
Check the wiring between the switch and the control module for chafing, broken strands and pin damage, wiggling the harness while watching live data
Using the manufacturer wiring diagram, measure the supply, earth and signal voltages at the switch connector
Test the switch with a multimeter for correct resistance or continuity in each position against the specification
Check live data to confirm the module sees the switch state change when the button is pressed
Check for applicable software updates or technical bulletins for the model before condemning the module

How to fix

Replace the performance selector switch if it fails the resistance or continuity tests
Repair or replace damaged wiring and fix any open or short circuits found
Clean, repair or replace corroded or loose connector terminals
Dry out and clean the switch area after liquid ingress, replacing affected parts
Update the control module software only if a known issue for that vehicle is confirmed
Replace the control module only after the wiring and switch are proven good and the manufacturer procedure calls for it

Can I keep driving?

Low severity

The car can normally be driven, as the transmission usually defaults to a standard shift mode, but have it checked soon. If shifts are harsh, erratic or the transmission goes into limp mode, limit driving and get it inspected promptly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.