What does code P26A1 mean?

Q: What does code P26A1 mean?

Exhaust Aftertreatment Glow Plug Circuit Low. P26A1 indicates that the engine control module (ECM) has detected an abnormally low voltage or current on the exhaust aftertreatment glow plug circuit, which is used to heat the exhaust system for emissions control. The ECM monitors the circuit and sets this code when the signal falls below the expected threshold, typically indicating a short to ground, an open circuit, or a failed glow plug.

DTC codes / P26xx · Computer and output circuits / P26A1

P26A1Exhaust Aftertreatment Glow Plug Circuit Low

P26A1 indicates that the engine control module (ECM) has detected an abnormally low voltage or current on the exhaust aftertreatment glow plug circuit, which is used to heat the exhaust system for emissions control. The ECM monitors the circuit and sets this code when the signal falls below the expected threshold, typically indicating a short to ground, an open circuit, or a failed glow plug.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

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