BMW DTC P1842 – Pressure Control Solenoid ‘B’ Circuit Low
DTC P1842 meaning on BMW
DTC P1842 indicates an issue with the Pressure Control Solenoid ‘B’ circuit in a BMW vehicle. This fault code is triggered when the Engine Control Module (ECM) detects that the voltage signal from the pressure control solenoid ‘B’ is lower than the specified range.
BMW DTC P1842 symptoms
Symptoms of DTC P1842 in a BMW may include harsh shifting, delayed gear engagement, transmission slipping, poor fuel economy, and in some cases, the transmission may go into limp mode. The Check Engine Light (CEL) may also illuminate on the dashboard.
BMW DTC P1842 causes
The common causes of DTC P1842 in a BMW include a faulty pressure control solenoid ‘B’, damaged wiring or connectors in the solenoid circuit, low transmission fluid level, or a malfunctioning ECM.
BMW DTC P1842 seriousness
Ignoring DTC P1842 in a BMW can lead to further damage to the transmission system, potentially resulting in costly repairs. It is important to address this issue promptly to prevent any long-term damage.
How to diagnose DTC P1842 on BMW
To diagnose DTC P1842 on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the fault codes stored in the ECM. They would then inspect the pressure control solenoid ‘B’ and its circuit for any visible damage or loose connections. Testing the solenoid’s resistance and checking the transmission fluid level may also be necessary.
How to fix DTC P1842 on BMW
Fixing DTC P1842 on a BMW usually involves replacing the faulty pressure control solenoid ‘B’ and repairing any damaged wiring or connectors in the circuit. Ensuring the transmission fluid is at the correct level and quality is also important. After the repairs are made, the fault codes should be cleared, and the vehicle should be test-driven to confirm the issue is resolved.
How to erase DTC P1842 on BMW
To erase DTC P1842 on a BMW, a diagnostic scanner capable of clearing fault codes is required. The mechanic would connect the scanner to the vehicle’s OBD-II port, navigate to the DTC menu, and select the option to clear the fault codes. Once the DTC P1842 is successfully erased, the Check Engine Light should turn off, indicating that the issue has been addressed.
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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