The powertrain control module (PCM) has detected an open electrical circuit in the glow plug system for cylinder 9. This means the expected current flow through the glow plug is interrupted, usually due to a failed glow plug or break in the wiring. The code sets when the circuit continuity test fails during the glow plug activation sequence.
The heating element inside cylinder 9's glow plug has burned out or broken internally, creating an open circuit that prevents current flow.
A break, chafe, or corrosion in the harness between the glow plug and the control module interrupts the circuit path.
The relay or module responsible for supplying current to the glow plug bank may have an internal fault affecting the specific output for cylinder 9.
High resistance or an open ground path for the glow plug circuit prevents the completion of the electrical circuit.
Rarely, the PCM may incorrectly interpret a good circuit as open due to internal driver failure or software issues; this should only be considered after all wiring and components are verified good.
Yes, but the engine will be difficult to start in cold weather and may produce excessive white smoke and run rough until warmed up.
While only cylinder 9 is faulty, glow plugs typically age similarly; replacing the full set prevents future failures and repeated labor costs, though replacing only the failed plug is acceptable.
Almost never. This code indicates an open circuit in the wiring or the glow plug itself. PCM failure is extremely rare for this specific code and should only be considered after all wiring and components have been verified good.
The engine will start poorly in cold conditions, potentially causing battery drain from extended cranking and incomplete combustion that can foul the oil with fuel.