BMW DTC P0599 – Thermostat Heater Control Circuit High
DTC P0599 meaning on BMW
DTC P0599 on a BMW indicates an issue with the thermostat heater control circuit being detected as high. This means that the powertrain control module (PCM) has detected an electrical malfunction in the circuit responsible for controlling the thermostat heater.
BMW DTC P0599 symptoms
Symptoms of DTC P0599 on a BMW may include:
- Check Engine Light illuminated on the dashboard
- Engine running hotter or colder than normal
- Poor fuel economy
- Engine overheating
BMW DTC P0599 causes
Common causes of DTC P0599 on a BMW include:
- Faulty thermostat heater
- Wiring or connector issues in the thermostat heater circuit
- Defective powertrain control module (PCM)
BMW DTC P0599 seriousness
DTC P0599 should not be ignored as it can lead to engine overheating or inefficient operation. It is important to address this issue promptly to prevent potential damage to the engine.
How to diagnose DTC P0599 on BMW
To diagnose DTC P0599 on a BMW, a mechanic may perform the following steps:
- Use a diagnostic scanner to retrieve the fault codes
- Inspect the thermostat heater and its wiring for any visible damage
- Test the thermostat heater circuit for continuity and proper voltage
- Check the powertrain control module (PCM) for any signs of malfunction
How to fix DTC P0599 on BMW
To fix DTC P0599 on a BMW, the following steps may be taken:
- Replace the faulty thermostat heater
- Repair or replace any damaged wiring or connectors in the circuit
- If the PCM is found to be defective, it may need to be reprogrammed or replaced
How to erase DTC P0599 on BMW
To erase DTC P0599 on a BMW, the fault codes can be cleared using a diagnostic scanner. After the issue has been fixed and the repairs have been made, the codes can be cleared to reset the Check Engine Light and ensure that the problem 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
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