P062B: Internal Control Module Fuel Injector Control Performance

What it means

The control module detected a performance problem in fuel injector control. The code alone does not establish a particular internal calculation fault or exclude injector-circuit problems.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The engine control module commands the fuel injectors and monitors whether their driver circuits operate as expected. P062B indicates a fuel-injector control performance problem, but it does not identify a specific injector or prove the fault is inside the module.

Common causes

Most likely first.

1. Open, shorted, or high-resistance injector wiring
2. Poor injector or control-module connector contact
3. Fuel-injector driver circuit fault
4. Low or unstable module power or ground
5. Control-module hardware or software fault

Symptoms

• Check engine light on
• Misfire or rough idle on the affected cylinder
• Increased fuel consumption
• Possible fuel smell or smoke from exhaust

How to diagnose it

1. Save freeze-frame data and scan for cylinder-specific misfire, injector-circuit, and low-voltage codes to identify when the fault occurs and whether a cylinder is implicated.
2. Use scan-tool misfire counts and available injector command data at idle and during the conditions recorded in the freeze frame.
3. Inspect injector connectors and harnesses, especially where they pass near hot or moving engine parts, for loose pins, corrosion, chafing, or fluid contamination.
4. Check injector wiring for opens, shorts, and excessive resistance using the manufacturer's circuit-isolation procedure.
5. Verify module power and grounds under load, then evaluate injector driver operation against the manufacturer's specification before considering a control-module fault.

Common fixes

• Repair damaged or chafed injector wiring.
• Clean and secure a loose or corroded injector or control-module connector.
• Repair unstable control-module power or ground connections.
• Repair a confirmed injector driver circuit fault.
• Reprogram or replace the control module only after wiring, power, and driver checks support that diagnosis.

Can I keep driving?

Avoid extended driving if the engine is misfiring, running roughly, or producing fuel smell or smoke; unburned fuel can overheat and damage the catalytic converter. If it runs normally, drive gently to a repair location and stop if it begins to misfire or stall.