DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0550)

DTC P0550

PSP switch circuit malfunction

DETECTION CONDITION

The PCM monitors PSP switch signal at PCM terminal 2T. If input voltage is low voltage (switch stays on) for 1 min when the VSS is above 60.0 km/h {37.4 mph} and ECT is above 60°C {140°F}, the PCM determines that PSP switch circuit has malfunction.

Diagnostic support note

This is a continuous monitor (CCM).
The MIL illuminates if the PCM detects above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
FREEZE FRAME DATA is available.
The DTC is stored in the PCM memory.

POSSIBLE CAUSE

PSP switch malfunction
Connector or terminal malfunction
Short to ground in wiring harness between PSP switch terminal A and PCM terminal 2T
PCM malfunction

Courtesy of MAZDA MOTORS CORP.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

DTC P0550: Notes