P263F Glow Plug Control Module 2 Over Temperature

P263F is reserved for engines with a second glow plug control module, for instance one per cylinder bank on large V engines; it reports that this second unit has exceeded its permitted internal temperature. No manufacturer documents P263F publicly, and the documented North American V8 diesels from Ford and GM manage all eight plugs with a single module, so they only use the module 1 code P263E. The logic would match that code: GM's L5P sets module 1 overheating above 123 °C during glowing, Ford's 6.7 L above 125 °C. CARB requires glow plugs to be monitored as one component. Likely triggers are high-current or shorted plugs on the bank served by module 2, extended glowing in severe cold, or an internal module fault. Cold starting suffers on one bank.

Likely causes

Symptoms

• Check engine light, glow lamp flashing
• Harder cold start, uneven running until warm

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, gsi.ext.gm.com, fordservicecontent.com.