BMW DTC P1702 – Substitute Function Combination
DTC P1702 meaning on BMW
DTC P1702 on a BMW refers to the Substitute Function Combination. This diagnostic trouble code indicates that there is a malfunction in the substitute function combination within the vehicle’s transmission control module.
BMW DTC P1702 symptoms
Symptoms of BMW DTC P1702 may include erratic shifting behavior, transmission slipping, harsh shifting, or the transmission going into limp mode. The vehicle may also exhibit reduced performance and fuel efficiency.
BMW DTC P1702 causes
The most common causes of DTC P1702 on a BMW include issues with the transmission control module, faulty wiring or connectors, low transmission fluid levels, or internal transmission problems such as worn clutches or solenoids.
BMW DTC P1702 seriousness
DTC P1702 on a BMW should be addressed promptly to prevent further damage to the transmission system. Ignoring this code can lead to more severe transmission issues and potentially costly repairs.
How to diagnose DTC P1702 on BMW
To diagnose DTC P1702 on a BMW, a mechanic will typically use a diagnostic scanner to retrieve the fault codes stored in the transmission control module. They will then perform a visual inspection of the wiring and connectors, check the transmission fluid level and condition, and conduct further tests to pinpoint the exact cause of the issue.
How to fix DTC P1702 on BMW
Fixing DTC P1702 on a BMW may involve repairing or replacing the transmission control module, addressing any wiring or connector issues, ensuring the transmission fluid is at the correct level and in good condition, and repairing any internal transmission problems. It is recommended to consult with a professional mechanic for an accurate diagnosis and proper repair.
How to erase DTC P1702 on BMW
To erase DTC P1702 on a BMW, a diagnostic scanner can be used to clear the fault codes stored in the transmission control module. After the repair has been completed, the mechanic can reset the codes, and the vehicle should be test-driven to ensure the issue has been resolved.
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.