What P062B means
P062B monitors the injector driver stage inside the engine module.
How the engine computer detects it
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 initialization, boost voltage (gasoline: 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, energizing over 200 µs during overrun), Ford gasoline engines only with cylinder deactivation. Chrysler's 3.0 L EcoDiesel was fixed by software. Misfires, loss of power or stalling follow.
Written from public technical sources and not yet checked by a mechanic. How we write these pages
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
- Short to ground on an injector high-voltage or control wire, or a faulty injector Possible
- Engine module software or calibration fault (update available) Possible
- Undervoltage or supply problem (battery, main relay) Possible
- Faulty driver chip in the engine module Possible
How to diagnose P062B
- Read every stored code with an OBD-II scanner. If misfire or fuel trim codes are there too, fix those first: they often cause this one.
- Inspect the parts involved: engine control module, injector driver, fuel injectors.
- Work through the causes above from most to least likely, cheapest checks first.
- Clear the code and drive a full drive cycle to confirm the repair held.
Reading the code
- P
- Powertrain
- 0
- Generic (SAE) code
- 6
- Computer and output circuits
- 2B
- Specific fault
Questions drivers ask
Can I drive with code P062B?
Drive gently and only as far as you need to. The engine computer may limit power to protect the engine, so avoid highways and heavy traffic until it's fixed. If the check engine light starts flashing, pull over.
Will my car pass an emissions inspection with P062B?
Probably not in states that test vehicles with an OBD-II scan: an emissions-related code that keeps the check engine light on is usually an automatic fail. Rules differ by state and county, so check yours.
This page is general information, not a substitute for a professional diagnosis. Repair costs are rough estimates for parts and labor and vary by vehicle and region.