What does code P1651 mean?

Q: What does code P1651 mean?

Power Steering Pressure Switch Circuit. P1651 on Mazda vehicles indicates that the powertrain control module (PCM) has detected an unexpected signal from the power steering pressure switch circuit, which monitors hydraulic pressure in the power steering system. The PCM uses this switch to sense when steering load increases, so it can raise idle speed to prevent stalling; when the circuit behaves outside its expected voltage range, the PCM stores this code and may illuminate the check engine light.

DTC codes / Mazda codes / P1651

P1651 · MazdaPower Steering Pressure Switch Circuit

P1651 on Mazda vehicles indicates that the powertrain control module (PCM) has detected an unexpected signal from the power steering pressure switch circuit, which monitors hydraulic pressure in the power steering system. The PCM uses this switch to sense when steering load increases, so it can raise idle speed to prevent stalling; when the circuit behaves outside its expected voltage range, the PCM stores this code and may illuminate the check engine light.

SystemPowertrain

Code typeMazda specific

SeverityLow

Fix difficultyIntermediate

AreaComputer and output circuits

Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.