What does code P1726 mean?

Q: What does code P1726 mean?

Insufficient Engine Speed Decrease During Self Test. P1726 on Ford vehicles indicates that during the engine speed self-test, the powertrain control module (PCM) commanded a decrease in engine speed but did not see the expected drop within the allowed time. The PCM monitors crankshaft speed via the crankshaft position sensor and compares it to the commanded idle speed during the test; insufficient decrease means the engine did not slow down as commanded, pointing to a fault in the idle control or related systems.

DTC codes / Ford codes / P1726

P1726 · FordInsufficient Engine Speed Decrease During Self Test

P1726 on Ford vehicles indicates that during the engine speed self-test, the powertrain control module (PCM) commanded a decrease in engine speed but did not see the expected drop within the allowed time. The PCM monitors crankshaft speed via the crankshaft position sensor and compares it to the commanded idle speed during the test; insufficient decrease means the engine did not slow down as commanded, pointing to a fault in the idle control or related systems.

SystemPowertrain

Code typeFord specific

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

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