Powertrain, generic · Computer and auxiliary outputs

P062B Internal Control Module Fuel Injector Control Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

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

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)

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–1,500
Time0.5–4 h

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

Parts involved

engine control moduleinjector driverfuel injectors

Related codes

P062DP0201P0261P02EEP0611P061B

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