P1697 – BMW DTC

BMW DTC P1697 – Main Relay Control Circuit High

DTC P1697 meaning on BMW

DTC P1697 on a BMW indicates a fault in the Main Relay Control Circuit, specifically a high voltage condition. This fault code is typically triggered when the Engine Control Module (ECM) detects a voltage higher than the specified threshold in the main relay control circuit.

BMW DTC P1697 symptoms

Symptoms of DTC P1697 on a BMW may include:

• Engine stalling or not starting
• Intermittent starting issues
• Check Engine Light (CEL) illuminated on the dashboard
• Reduced engine performance

BMW DTC P1697 causes

Common causes of DTC P1697 on a BMW include:

• Faulty main relay
• Short circuit in the main relay control circuit
• High resistance in the main relay control circuit
• Faulty Engine Control Module (ECM)

BMW DTC P1697 seriousness

DTC P1697 should be addressed promptly as it can lead to potential starting and engine performance issues. Ignoring this fault code may result in further damage to the vehicle’s electrical system.

How to diagnose DTC P1697 on BMW

To diagnose DTC P1697 on a BMW, follow these steps:

1. Use a diagnostic scanner to retrieve the fault code and freeze frame data.
2. Inspect the main relay and its control circuit for any visible damage or corrosion.
3. Check the voltage levels in the main relay control circuit using a multimeter.
4. Perform a continuity test on the wiring harness connected to the main relay.
5. Inspect the ECM for any signs of damage or malfunction.

How to fix DTC P1697 on BMW

To fix DTC P1697 on a BMW, consider the following steps:

1. Replace the faulty main relay if it is determined to be the cause of the high voltage condition.
2. Repair any short circuits or high resistance in the main relay control circuit.
3. If the ECM is faulty, consider replacing or reprogramming it as necessary.
4. Clear the fault code using a diagnostic scanner after the repairs have been completed.

How to erase DTC P1697 on BMW

To erase DTC P1697 on a BMW, follow these steps:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port.
2. Access the scanner’s menu to clear the fault codes stored in the ECM.
3. Follow the on-screen prompts to erase the DTC P1697 code.
4. Once the code has been cleared, start the vehicle to ensure 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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