What does code P1691 mean?

Q: What does code P1691 mean?

Turbo Pressure Control Solenoid Circuit. P1691 on a Mazda indicates that the powertrain control module (PCM) has detected an electrical fault in the turbo pressure control solenoid circuit, which regulates boost pressure on turbocharged engines. The PCM monitors the solenoid's command and feedback signals and sets this code when the circuit is open, shorted, or the current draw is outside the expected range.

DTC codes / Mazda codes / P1691

P1691 · MazdaTurbo Pressure Control Solenoid Circuit

P1691 on a Mazda indicates that the powertrain control module (PCM) has detected an electrical fault in the turbo pressure control solenoid circuit, which regulates boost pressure on turbocharged engines. The PCM monitors the solenoid's command and feedback signals and sets this code when the circuit is open, shorted, or the current draw is outside the expected range.

SystemPowertrain

Code typeMazda specific

SeverityMedium

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.