P062B: Internal Control Module Fuel Injector Control Performance

What does P062B mean?

P062B monitors the injector driver stage inside the engine module. On direct injection engines a separate driver chip generates the boost voltage for opening the injectors and is configured by the main processor via SPI; GM checks initialisation, boost voltage (petrol: 90 V or more or 40 V or less), self-test, data download and communication, and sets the code in the first trip – while it is active, single injector circuit codes are suppressed. Saab's 2.0 L turbo also counts a short to ground in an injector circuit (10 s, two trips). Ford's diesel uses it as a plausibility check of the injection command (post injection, energising over 200 µs during overrun), Ford petrol engines only with cylinder deactivation. Chrysler's 3.0 L EcoDiesel was fixed by software. Misfires, loss of power or stalling follow.

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)
• Stumbling, misfires, loss of power
• Starting problems or stalling
• Other injector codes are not reported while P062B is active (GM)

Common causes

• Medium Short to ground on an injector high-voltage or control wire, or a faulty injector
• Medium Engine module software or calibration fault (update available)
• Medium Undervoltage or supply problem (battery, main relay)
• Medium Faulty driver chip in the engine module

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