P1699 – BMW DTC

BMW DTC P1699 – Transmission Control Module Check Sum Error

DTC P1699 meaning on BMW

The Diagnostic Trouble Code (DTC) P1699 for BMW indicates a Transmission Control Module (TCM) Check Sum Error. This error occurs when the TCM detects that the data it is receiving or processing is incorrect or corrupted, leading to a discrepancy in the checksum value.

BMW DTC P1699 symptoms

Symptoms of the BMW DTC P1699 may include:

• Transmission shifting issues
• Harsh or erratic shifting
• Transmission stuck in a single gear
• Check Engine Light (CEL) illuminated on the dashboard

BMW DTC P1699 causes

Common causes of the BMW DTC P1699 include:

• Corrupted or incorrect data in the TCM
• Faulty TCM software or hardware
• Electrical interference or wiring issues

BMW DTC P1699 seriousness

The DTC P1699 for BMW should be addressed promptly as it can lead to drivability issues and potential damage to the transmission system if left unresolved. Ignoring this error code may result in further complications and costly repairs.

How to diagnose DTC P1699 on BMW

To diagnose the DTC P1699 on a BMW, a mechanic would typically perform the following steps:

1. Use a diagnostic scanner to retrieve the specific error code
2. Inspect the TCM for any visible signs of damage or corrosion
3. Check the wiring harness and connectors for loose connections or shorts
4. Perform a thorough inspection of the transmission system for any related issues

How to fix DTC P1699 on BMW

To fix the DTC P1699 on a BMW, the following steps may be taken:

1. Clear the error code using a diagnostic scanner and monitor the system for recurrence
2. Update the TCM software to the latest version provided by BMW
3. Repair or replace any damaged wiring or connectors in the transmission system
4. If necessary, replace the TCM with a new unit

How to erase DTC P1699 on BMW

To erase the DTC P1699 on a BMW, follow these steps:

1. Connect a diagnostic scanner to the vehicle’s OBD-II port
2. Select the option to clear the stored error codes
3. Confirm the action and wait for the scanner to complete the process
4. Start the vehicle and ensure the Check Engine Light is no longer illuminated

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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