What does code P1661 mean?

Q: What does code P1661 mean?

Output Circuit Check Signal Low. P1661 on Ford vehicles means the powertrain control module (PCM) has detected a low voltage condition on the output circuit check signal, which is a feedback line used to verify that a controlled output is functioning. The PCM expects to see a specific voltage on this circuit when the output is commanded, and a persistently low signal indicates an open, short to ground, or faulty component in that circuit.

DTC codes / Ford codes / P1661

P1661 · FordOutput Circuit Check Signal Low

P1661 on Ford vehicles means the powertrain control module (PCM) has detected a low voltage condition on the output circuit check signal, which is a feedback line used to verify that a controlled output is functioning. The PCM expects to see a specific voltage on this circuit when the output is commanded, and a persistently low signal indicates an open, short to ground, or faulty component in that circuit.

SystemPowertrain

Code typeFord specific

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

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