What does code P1691 mean?

Q: What does code P1691 mean?

MIL Open Circuit. P1691 on Volkswagen vehicles means the engine control module has detected an open circuit in the wire that drives the malfunction indicator lamp (MIL, the check engine light) in the instrument cluster. The computer commands the lamp on during the bulb-check phase and monitors the circuit, and it sees no current flow or an unexpected voltage, so it flags the lamp driver circuit as open.

DTC codes / Volkswagen codes / P1691

P1691 · VolkswagenMIL Open Circuit

P1691 on Volkswagen vehicles means the engine control module has detected an open circuit in the wire that drives the malfunction indicator lamp (MIL, the check engine light) in the instrument cluster. The computer commands the lamp on during the bulb-check phase and monitors the circuit, and it sees no current flow or an unexpected voltage, so it flags the lamp driver circuit as open.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

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