P1248 – BMW DTC

BMW DTC P1248 – Forced Upshift due to Overtemperature Condition Engine Oil and/or Engine Coolant

DTC P1248 meaning on BMW

DTC P1248 on a BMW indicates a Forced Upshift due to Overtemperature Condition in the engine oil and/or engine coolant. This diagnostic trouble code triggers when the engine control module detects that the temperature of the engine oil and/or coolant has exceeded safe operating limits, leading to a forced upshift to prevent potential damage to the engine components.

BMW DTC P1248 symptoms

Symptoms of DTC P1248 on a BMW may include:

• Forced upshifting of gears
• Reduced engine performance
• Engine overheating warning light
• Increased engine temperature readings

BMW DTC P1248 causes

The common causes of DTC P1248 on a BMW are:

• Low engine oil level
• Engine coolant level too low
• Malfunctioning engine coolant temperature sensor
• Thermostat failure
• Engine oil or coolant leaks

BMW DTC P1248 seriousness

DTC P1248 should be taken seriously as it can lead to potential engine damage if not addressed promptly. Forced upshifting due to overtemperature conditions can cause increased stress on engine components and may result in engine overheating, which can lead to severe engine damage if left unresolved.

How to diagnose DTC P1248 on BMW

To diagnose DTC P1248 on a BMW, you can perform the following steps:

1. Use a diagnostic scanner to retrieve the fault codes stored in the engine control module.
2. Check the engine oil level and quality.
3. Inspect the engine coolant level and condition.
4. Test the engine coolant temperature sensor for proper operation.
5. Check for any visible leaks in the engine oil or coolant system.

How to fix DTC P1248 on BMW

To fix DTC P1248 on a BMW, you can try the following solutions:

1. Top up the engine oil and coolant to the recommended levels.
2. Replace the engine coolant temperature sensor if faulty.
3. Repair any leaks in the engine oil or coolant system.
4. Check and replace the thermostat if necessary.
5. Clear the fault codes using a diagnostic scanner after addressing the root cause.

How to erase DTC P1248 on BMW

To erase DTC P1248 on a BMW, follow these steps:

1. Ensure the root cause of the fault code has been addressed.
2. Use a diagnostic scanner to clear the fault codes stored in the engine control module.
3. Perform a test drive to confirm that the issue 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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