BMW DTC P078C – Shift Timing Solenoid ‘B’ Low
DTC P078C meaning on BMW
The DTC P078C code on a BMW indicates an issue with the Shift Timing Solenoid ‘B’ being detected as operating at a low level. This solenoid is responsible for controlling the timing of gear shifts in the transmission system.
BMW DTC P078C symptoms
Symptoms of the DTC P078C code on a BMW may include harsh or delayed shifting, erratic shifting behavior, transmission slipping, decreased fuel efficiency, and in some cases, the transmission may go into a limp mode.
BMW DTC P078C causes
The common causes of the DTC P078C code on a BMW include a faulty Shift Timing Solenoid ‘B’, wiring issues in the solenoid circuit, low transmission fluid level, dirty or contaminated transmission fluid, or internal transmission problems.
BMW DTC P078C seriousness
Ignoring the DTC P078C code on a BMW can lead to further damage to the transmission system, potentially resulting in complete transmission failure. It is important to address this issue promptly to prevent costly repairs.
How to diagnose DTC P078C on BMW
To diagnose the DTC P078C code on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer. They would then inspect the Shift Timing Solenoid ‘B’, check the wiring and connectors for any damage, and perform a transmission fluid level and condition check.
How to fix DTC P078C on BMW
Fixing the DTC P078C code on a BMW may involve replacing the Shift Timing Solenoid ‘B’ if it is found to be faulty, repairing any damaged wiring or connectors, performing a transmission fluid flush and filter replacement, or addressing any internal transmission issues identified during diagnosis.
How to erase DTC P078C on BMW
Once the underlying issue causing the DTC P078C code on a BMW has been resolved, the code can be cleared using a diagnostic scanner. The scanner can reset the fault codes stored in the vehicle’s computer, erasing the DTC P078C code from the system.
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
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.