P062D: Fuel Injector Driver Circuit Performance Bank 1

What does P062D mean?

Direct-injection injectors (petrol and common-rail diesel) need a high boost voltage generated in the module to open fast; the module then holds them with pulsed battery voltage. P062D monitors this boost voltage or the shared injector supply of bank 1. GM's 2018 Duramax sets it when the internal boost voltage is above 75 V or below about 52 V, the supply line to the injectors is open or the module has an internal fault, in 14 of 20 samples at 6.25 ms, with the lamp in the first trip (2025: above 60 V or below 40 V). Ford's petrol direct injection flags it when the opening current is not reached in time (10 s, no cylinder named), Ford's diesel when the driver chip reports a loss of high voltage (0.5 s). Injectors then open late or not at all: misfires, rough running, loss of power or no start. GM uses only P062D, also on V8s. Single injector circuits are P0201 ff.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

• Check engine light (GM in the first trip)
• Misfires, rough running, stumbling
• Loss of power or limp mode
• Hard start or no start

Common causes

• High Short in an injector high-side wire or injector collapsing the boost voltage
• Medium Module internal (boost converter, driver chip)
• Medium System undervoltage or poor ground
• Medium Harness or injector connector (moisture, oil)

Likelihood is a general estimate across vehicles; your make and model may differ.