P124B Possible Causes
- Faulty fuel injector
- Fuel injector harness is open or short-circuited
- Poor electrical connection of the fuel injector circuit
How is the P124B code repaired?
Start by checking the “Possible Causes” listed above. Visually inspect the wiring harness and associated connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Engine light on (or maintenance engine warning light soon)
P124B Meaning
The Engine Control Module (ECM) provides voltage to each fuel injector on the high voltage supply circuits of the injectors. The ECM powers each fuel injector by grounding the high voltage control circuit of the fuel injector. The ECM monitors the status of the injectors’ high voltage supply circuits and the fuel injectors’ high voltage control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector or injectors are deactivated.