Low or unstable power supply or ground to the control module (weak battery, poor charging, corroded earth); Damaged wiring or poor connector contact in the injector control circuits or module connector; Outdated or faulty ECM software calibration (only where the manufacturer has issued a known update for this fault); Injector with a shorted or high-resistance coil loading the module's driver circuit; Water ingress or corrosion in the module or its connectors; Internal failure of the engine control module injector driver.

P062B

Internal Control Module Fuel Injector Control Performance.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
6: AreaComputer and output circuits
2B: FaultThe specific fault in that area

What it means

P062B is the generic code for a performance fault in the fuel injector control circuits inside the engine control module (ECM/PCM). The module's internal self-monitoring has detected that its own injector driver circuitry is not behaving as expected, so the fault lies in how the module controls the injectors rather than in a specific injector. The exact monitoring strategy varies by manufacturer and engine.

Symptoms

Engine warning light on
Engine misfire or rough running
Poor starting or long cranking
Loss of power or limp mode
Uneven idle or stalling
Increased fuel consumption

Possible causes

Low or unstable power supply or ground to the control module (weak battery, poor charging, corroded earth)likely
Damaged wiring or poor connector contact in the injector control circuits or module connectorlikely
Outdated or faulty ECM software calibration (only where the manufacturer has issued a known update for this fault)possible
Injector with a shorted or high-resistance coil loading the module's driver circuitpossible
Water ingress or corrosion in the module or its connectorspossible
Internal failure of the engine control module injector driverrare

How to diagnose

Read all stored and pending codes and freeze frame data, noting engine speed, load, temperature and battery voltage when the fault set.
Check for related codes, especially injector circuit, misfire, supply voltage or communication faults, and diagnose those first.
Test battery condition and charging voltage, and check the module's main power and earth connections for voltage drop.
Inspect the engine harness and ECM connectors for chafing, corrosion, water, bent or pushed-back pins.
Measure the resistance of each injector coil and check the injector wiring for shorts to earth, shorts to voltage or open circuit, following the manufacturer's data.
Watch injector activity and misfire counters in live data to see if the fault follows a particular cylinder.
Check for available manufacturer software updates or technical bulletins relating to this code for the specific model and engine.
If everything else is sound, confirm the module fault with manufacturer-specific tests before condemning the unit.

How to fix

Repair or replace the battery, charging system or earth connections as needed.
Repair damaged wiring and clean or replace corroded or damaged connectors.
Replace any injector found to be electrically faulty.
Apply an official ECM software update where a known calibration fault applies.
Replace and, where required, programme the engine control module if an internal fault is confirmed.
Dry out and treat water ingress, and fix the source of the leak.

Can I keep driving?

Medium severity

The car may run normally or enter limp mode, but misfires and stalling are possible, so have it checked soon. Avoid long journeys or hard driving, as unburnt fuel from a misfire can damage the catalytic converter.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.