The engine computer tracks current flow through all glow plugs during the pre-start phase. If the current draw on cylinder 7 differs from the other cylinders, the computer logs this fault code. This occurs when the plug's internal coil wears out or when installing an incorrect replacement plug. Always verify the part number and resistance specifications match the other glow plugs on the engine.
Mechanic Glossary
7 Glow Plug Incorrect
A fault indicating that current draw or resistance values from the cylinder 7 glow plug mismatch expected parameters.
Frequently Asked Questions
The engine computer detected abnormal current draw or resistance from the cylinder 7 glow plug during startup.
Yes. Different brands have slightly different resistance values. The computer will detect this difference and set a code.
Replace the plug with one that matches the factory specifications, and cycle the ignition a few times to clear the fault.