BMW DTC P1874 – 5-4 Shift Circuit High
DTC P1874 meaning on BMW
DTC P1874 on a BMW indicates a fault in the 5-4 shift circuit, specifically a high voltage condition. This code is typically related to issues with the transmission control module or wiring.
BMW DTC P1874 symptoms
Symptoms of DTC P1874 on a BMW may include harsh shifting, delayed shifting, transmission slipping, or the transmission going into limp mode. The vehicle may also experience decreased fuel efficiency.
BMW DTC P1874 causes
The common causes of DTC P1874 on a BMW include a faulty transmission control module, damaged wiring or connectors in the 5-4 shift circuit, or a malfunctioning shift solenoid.
BMW DTC P1874 seriousness
DTC P1874 should be addressed promptly as it can lead to further damage to the transmission if left unresolved. Ignoring this fault may result in more severe transmission issues and potentially costly repairs.
How to diagnose DTC P1874 on BMW
To diagnose DTC P1874 on a BMW, a mechanic would typically use a diagnostic scanner to retrieve the fault code and then perform a thorough inspection of the transmission control module, wiring, and shift solenoid. Testing the voltage and continuity in the 5-4 shift circuit is crucial to pinpointing the exact cause of the issue.
How to fix DTC P1874 on BMW
Fixing DTC P1874 on a BMW may involve replacing the transmission control module, repairing or replacing damaged wiring or connectors, or replacing the faulty shift solenoid. It is essential to follow the manufacturer’s diagnostic and repair procedures to ensure a proper fix.
How to erase DTC P1874 on BMW
Once the underlying issue causing DTC P1874 on a BMW has been resolved, the fault code can be cleared using a diagnostic scanner. This will reset the vehicle’s onboard computer and turn off the check engine light. It is important to verify that the issue has been fixed before clearing the code.
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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