P112B – BMW DTC

BMW DTC P112B – Engine Coolant Temperature Too Low

DTC P112B meaning on BMW

DTC P112B on a BMW indicates that the Engine Coolant Temperature (ECT) is too low. The Engine Control Module (ECM) monitors the temperature of the engine coolant to ensure optimal engine performance and emissions control. When the ECM detects that the coolant temperature is below the specified range, it triggers the P112B fault code.

BMW DTC P112B symptoms

Symptoms of DTC P112B on a BMW may include:

• Engine running colder than normal
• Decreased fuel efficiency
• Check Engine Light (CEL) illuminated on the dashboard
• Possible rough idling or stalling

BMW DTC P112B causes

The common causes of DTC P112B on a BMW are:

• Malfunctioning Engine Coolant Temperature (ECT) sensor
• Low coolant level
• Thermostat stuck open
• Wiring or connector issues in the ECT circuit

BMW DTC P112B seriousness

While DTC P112B may not cause immediate harm to the engine, it can lead to decreased fuel efficiency and performance issues if left unresolved. It is important to address this fault code promptly to prevent potential long-term damage to the engine.

How to diagnose DTC P112B on BMW

To diagnose DTC P112B on a BMW, you can follow these steps:

1. Use an OBD-II scanner to retrieve the fault code and freeze frame data
2. Inspect the coolant level and quality
3. Check the ECT sensor for proper operation
4. Inspect the thermostat for proper function
5. Check the wiring and connectors in the ECT circuit for any damage or corrosion

How to fix DTC P112B on BMW

To fix DTC P112B on a BMW, you can try the following solutions:

1. Replace the Engine Coolant Temperature (ECT) sensor if faulty
2. Top up the coolant level if low
3. Replace the thermostat if stuck open
4. Repair any damaged wiring or connectors in the ECT circuit

How to erase DTC P112B on BMW

To erase DTC P112B on a BMW, you can use an OBD-II scanner to clear the fault code from the ECM’s memory. After fixing the underlying issue causing the fault code, you can reset the ECM and erase the code to turn off the Check Engine Light.

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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