BMW DTC P1C99 – Loading Interface Module Contactor Control Positive Contactor Driver Circuit High
DTC P1C99 meaning on BMW
DTC P1C99 in a BMW indicates an issue with the Loading Interface Module Contactor Control Positive Contactor Driver Circuit being detected as high. This fault code is specific to the contactor control system within the vehicle.
BMW DTC P1C99 symptoms
Symptoms of DTC P1C99 in a BMW may include issues with the contactor control system, such as difficulty starting the vehicle, erratic behavior of the contactors, or warning lights on the dashboard related to the system.
BMW DTC P1C99 causes
Common causes of DTC P1C99 in a BMW can include faulty contactors, wiring issues, a malfunctioning contactor driver circuit, or problems with the loading interface module itself.
BMW DTC P1C99 seriousness
While DTC P1C99 may not always result in immediate drivability issues, it is important to address this fault code promptly to prevent potential failures in the contactor control system, which could lead to starting problems or other electrical malfunctions.
How to diagnose DTC P1C99 on BMW
- Use a diagnostic scanner to retrieve the fault code and further details about the specific nature of the issue.
- Inspect the contactors, wiring, and contactor driver circuit for any visible damage or loose connections.
- Perform electrical tests to check the continuity and resistance of the components involved in the contactor control system.
How to fix DTC P1C99 on BMW
- Replace any faulty contactors or damaged wiring in the contactor control system.
- Repair or replace the contactor driver circuit if it is found to be malfunctioning.
- If the issue lies with the loading interface module, it may need to be replaced or reprogrammed by a qualified technician.
How to erase DTC P1C99 on BMW
- After addressing and fixing the root cause of the DTC P1C99, use a diagnostic scanner to clear the fault code from the vehicle’s memory.
- Ensure that the repairs have been successful by performing a test drive and monitoring the contactor control system for any recurring issues.
Recommended tools & DTC Scanners for BMW
Best Diagnostic App for modern BMWs: BimmerLink
Recommended Bluetooth adapter for Bimmerlink: OBDLink CX
Cable adapter for Bimmerlink: Enet Cable USB Type C
For older BMWs we recommend: Autel AutoLink AL319 (2024 version)
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
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