BMW DTC P1788 – Transmission Ratio Control Actuator Short Circuit
DTC P1788 meaning on BMW
DTC P1788 on a BMW refers to a Transmission Ratio Control Actuator Short Circuit. This diagnostic trouble code indicates that there is a short circuit detected in the transmission ratio control actuator circuit.
BMW DTC P1788 symptoms
Symptoms of BMW DTC P1788 may include:
- Transmission shifting issues
- Transmission slipping
- Check Engine Light illuminated
BMW DTC P1788 causes
Common causes of BMW DTC P1788 include:
- Short circuit in the transmission ratio control actuator wiring
- Faulty transmission ratio control actuator
- Corrosion or damage to the actuator connector
BMW DTC P1788 seriousness
The seriousness of BMW DTC P1788 lies in the potential transmission issues it can cause. Ignoring this fault code can lead to further damage to the transmission system and potentially result in costly repairs.
How to diagnose DTC P1788 on BMW
To diagnose DTC P1788 on a BMW, you can:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the transmission ratio control actuator wiring for any visible damage
- Check the actuator connector for corrosion or loose connections
How to fix DTC P1788 on BMW
To fix DTC P1788 on a BMW, you may need to:
- Repair any damaged wiring in the transmission ratio control actuator circuit
- Replace the faulty transmission ratio control actuator
- Clean or replace the actuator connector if necessary
How to erase DTC P1788 on BMW
To erase DTC P1788 on a BMW, you can:
- Use a diagnostic scanner to clear the fault codes
- After fixing the underlying issue, reset the transmission control module
- Ensure that the Check Engine Light is no longer illuminated
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.