There are 2 separate issues:
1. Actual low pressure: COLD weather decreases tire pressure so the warning may be real.
Always check with an independent tire pressure gauge.
2. Swapping winter vs summer tires: If the TPMS ECU sees "strange IDs from the 4 wheel sensors", it registers a different message, basically it reads it as "system malfunction" because it cannot read any "known" IDs from the wheels.
1. Actual low pressure: COLD weather decreases tire pressure so the warning may be real.
Always check with an independent tire pressure gauge.
2. Swapping winter vs summer tires: If the TPMS ECU sees "strange IDs from the 4 wheel sensors", it registers a different message, basically it reads it as "system malfunction" because it cannot read any "known" IDs from the wheels.