Cause
Shorted glow plug overloading the module
A glow plug shorted internally, drawing far more current than its driver can supply. The code names the module or its circuit, not the plug — which is the whole point of the entry, and the reason modules get replaced unnecessarily.
A shorted plug is a load fault presenting as a driver fault. The module either reports an over-current on that channel or its output stage fails, and a replacement module fitted to the same plug fails again. Measure each plug's resistance before fitting anything: a healthy plug reads well under two ohms and a shorted one near zero, so the outlier is obvious in minutes. Replace glow plugs as a set where one has failed, since the others are the same age and the next short takes the new module.
Typically a moderate job.
Codes this can cause (1)
Codes where this is a likely explanation first, rather than merely a possible one.
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Others who found this
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
Sign in or create an account to add what you found about Shorted glow plug overloading the module.