BMW DTC P1B38 – Hybrid/EV Battery Coolant Valve to Chiller Circuit Low
DTC P1B38 meaning on BMW
The DTC P1B38 code on BMW vehicles indicates an issue with the Hybrid/EV Battery Coolant Valve to Chiller Circuit being detected as low. This fault typically points to a problem with the valve or the circuit that controls the flow of coolant to the chiller unit in the hybrid or electric vehicle system.
BMW DTC P1B38 symptoms
Symptoms of the DTC P1B38 code on a BMW may include poor cooling performance of the hybrid or electric vehicle system, reduced efficiency, and potentially triggering the vehicle into a reduced power mode to prevent damage to the battery or other components.
BMW DTC P1B38 causes
The DTC P1B38 code on BMW vehicles can be triggered by various factors, including a malfunctioning Hybrid/EV Battery Coolant Valve, wiring issues in the circuit, low coolant levels, or a faulty chiller unit.
BMW DTC P1B38 seriousness
The seriousness of the DTC P1B38 code on a BMW depends on the underlying cause. Ignoring this fault can lead to reduced performance and efficiency of the hybrid or electric system, potentially causing further damage if not addressed promptly.
How to diagnose DTC P1B38 on BMW
To diagnose the DTC P1B38 code on a BMW, a mechanic would typically start by using a diagnostic scanner to retrieve the specific fault codes. They would then inspect the Hybrid/EV Battery Coolant Valve, check the wiring for any damage or loose connections, and ensure proper coolant levels in the system.
How to fix DTC P1B38 on BMW
Fixing the DTC P1B38 code on a BMW may involve replacing the faulty Hybrid/EV Battery Coolant Valve, repairing any damaged wiring, topping up coolant levels, or addressing issues with the chiller unit. It is recommended to follow the manufacturer’s repair procedures and use genuine parts for a reliable fix.
How to erase DTC P1B38 on BMW
Once the underlying issue causing the DTC P1B38 code on a BMW has been resolved, the code can be cleared using a diagnostic scanner. By erasing the fault code, the vehicle’s onboard computer will reset and monitor the system for any recurring issues.
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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