DTClookup.com

Search DTC

P1A78 – BMW DTC

BMW DTC P1A78 – Starter Generator Circuit Low

DTC P1A78 meaning on BMW

The DTC P1A78 code on BMW vehicles indicates a low circuit condition in the starter generator system. This fault is related to the electrical components responsible for starting the engine and generating power in hybrid or electric vehicles.

BMW DTC P1A78 symptoms

Symptoms of the DTC P1A78 code on a BMW may include:

  • Engine starting issues
  • Reduced power output
  • Malfunction indicator light (MIL) illuminated on the dashboard

BMW DTC P1A78 causes

Common causes of the DTC P1A78 code on BMW vehicles include:

  • Faulty starter generator
  • Wiring or connection issues in the starter generator circuit
  • Defective control modules

BMW DTC P1A78 seriousness

The DTC P1A78 code should be addressed promptly as it can lead to starting problems and reduced power output in the vehicle. Ignoring this issue may result in further damage to the starter generator system.

How to diagnose DTC P1A78 on BMW

To diagnose the DTC P1A78 code on a BMW, a mechanic may perform the following steps:

  1. Use a diagnostic scanner to retrieve the fault codes stored in the vehicle’s computer
  2. Inspect the starter generator system for any visible damage or loose connections
  3. Test the electrical components in the circuit for proper functionality

How to fix DTC P1A78 on BMW

To fix the DTC P1A78 code on a BMW, the following steps may be taken:

  1. Repair or replace any damaged wiring or connections in the starter generator circuit
  2. Replace the faulty starter generator if necessary
  3. Reset the fault codes using a diagnostic scanner after the repairs have been completed

How to erase DTC P1A78 on BMW

To erase the DTC P1A78 code on a BMW, follow these steps:

  1. Use a diagnostic scanner to clear the fault codes stored in the vehicle’s computer
  2. Ensure that the underlying issue causing the fault code has been addressed and repaired
  3. Perform a test drive to confirm that the code does not reappear

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

← All BMW Diagnostic Trouble Codes

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.