Fault code P1690 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1690 – Wastegate Solenoid Circuit Malfunction

P1690: Causes, signs and repairs

Error code P1690 is displayed and the check engine light is on - what does this mean?

The DTC P1690 is recognized by the OBD/EOBD system if there is a problem with the immobilizer or the communication between the engine control unit and the immobilizer module. This manufacturer-specific trouble code mainly affects the vehicle's safety system and can have different meanings for different brands.

What causes can this error code have?

Defective immobilizer module
Faulty communication between ECU and immobilizer
Damaged cable connections to the safety system
Defective transponder in the vehicle key
Loose or corroded plug connections
Software error in the engine control unit
Defective antenna of the immobilizer system
Voltage problems in the vehicle electrics

What symptoms occur in parallel with error code P1690?

Starting problems: The vehicle cannot be started or only starts sporadically
Engine shutdown: The engine switches off while driving
Immobilizer activated: The safety system prevents starting
Warning lights: Check engine light and possibly immobilizer warning light illuminated
Key recognition: The vehicle key is not recognized
Communication error: Error messages in the display regarding the security system

How can the problem with fault code P1690 be rectified?

Repairing fault code P1690 requires a systematic diagnosis of the immobilizer system.
Inspection and replacement of the defective immobilizer module by qualified personnel
Reprogramming or updating the software in the engine control unit
Repair or replacement of damaged cable connections between ECU and immobilizer
Replacement of the defective transponder key and teach-in of the system
Cleaning and securing all plug connections of the safety system
Replacement of the defective immobilizer antenna in the ignition lock area
Checking and repairing the power supply to the safety system
Complete system diagnostics and reset of the immobilizer by a specialist workshop

FAQ - Frequently asked questions about DTC P1690

Can I continue driving with error code P1690?

No, error code P1690 can result in the vehicle not starting or switching off while driving. An immediate repair is required.

How much does it cost to repair error code P1690?

The repair costs for P1690 are between 150-800 euros, depending on the cause. A software update costs around 150-250 euros, while replacing the immobilizer module can cost 400-800 euros.

How can I delete the P1690 error code myself?

The P1690 code should only be deleted by an OBD scanner after a successful repair. Simply deleting the code without rectifying the cause will cause it to reoccur.

Is the P1690 error code the same for all manufacturers?

No, P1690 is a manufacturer-specific code and can have different meanings for different brands. The exact definition depends on the vehicle manufacturer.

Can a weak battery cause the P1690 code?

Yes, a weak or defective battery can cause communication problems in the immobilizer system and thus trigger the DTC P1690.

How long does it take to diagnose the P1690 fault code?

The diagnosis of EOBD code P1690 usually takes 1-2 hours, as a comprehensive check of the safety system is required.

Vehicles in which fault code P1690 occurs most frequently

Error code P1690 is a manufacturer-specific trouble code that refers to problems with the immobilizer system and can cause various safety and starting problems, but is most common in the following vehicles:

Chrysler: 300C, Sebring, PT Cruiser, Town & Country (2004-2010)
Dodge: Caravan, Grand Caravan, Caliber, Avenger (2005-2012)
Jeep: Grand Cherokee, Liberty, Commander, Compass (2004-2010)
Plymouth: Voyager, Neon (1999-2001)
Ram: 1500, 2500, 3500 (2009-2012)
Fiat: 500, Punto, Bravo (2007-2014)
Lancia: Ypsilon, Delta, Musa (2006-2013)

If the code P1690 occurs in your vehicle, you should visit a specialist workshop immediately, as this error code affects the safety system and can lead to starting problems or unintentional engine standstill. A professional diagnosis is essential, as the immobilizer system is complex and special diagnostic equipment and manufacturer software are required for the repair.

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