Fault code P1662 – a step-by-step guide to diagnosing and fixing it

The meaning of error code P1662 – IDM_EN Circuit Failure

P1662: Causes, signs and repairs

Error code P1662 is displayed and the check engine light is on - what does this mean?

The DTC P1662 is a manufacturer-specific fault code that is recognized by the OBD system and typically indicates a problem with the fuel pump driver or the fuel pump control unit. This trouble code can have different meanings for different vehicle brands, but usually relates to the fuel system or the electrical control of the fuel pump.

What causes can this error code have?

Defective fuel pump
Damaged fuel pump relay
Broken cable connections to the fuel pump driver
Defective fuel pump driver in the control unit
Corroded or loose plug connections
Short circuit in the fuel pump wiring
Defective fuel pressure sensor
Problems with the power supply

What symptoms occur in parallel with fault code P1662?

Starting problems: The vehicle is difficult or impossible to start
Loss of power: Reduced engine power while driving
Jerking: Engine runs out of round or stutters
Smell of fuel: Smell of gasoline in or around the vehicle
Stalling of the engine: Engine stalls while driving
Poor acceleration: Delayed response when accelerating

How can the problem with error code P1662 be rectified?

Repairing EOBD fault code P1662 requires a systematic diagnosis of the fuel system.
Check fuel pump relay and replace if necessary - often the most cost-effective solution
Check all electrical connections to the fuel pump for corrosion and tightness and clean them
Test fuel pump for proper function and replace defective pump completely
Measure the wiring of the fuel pump driver with a multimeter and repair damaged cables
Check fuel pressure sensor and replace if malfunctioning
Check the control unit software for updates and have it reprogrammed if necessary

FAQ - Frequently asked questions about DTC P1662

Can I continue driving with error code P1662?

Continuing to drive with code P1662 is not recommended, as problems with the fuel supply can lead to sudden engine failures. This poses a significant safety risk, especially at high speeds or in heavy traffic.

How much does it cost to repair fault code P1662?

The repair costs for fault code P1662 vary depending on the cause: Replacing a relay costs around 20-50 euros, while replacing a fuel pump can cost between 200-800 euros. Labor costs in the workshop are an additional 80-120 euros per hour.

Is fault code P1662 the same for all vehicle brands?

No, P1662 is a manufacturer-specific DTC and can have different meanings for different brands. With BMW, it often refers to the fuel pump control unit, while with other manufacturers it can affect other systems.

How can I delete error code P1662 myself?

The code P1662 can be deleted with an OBD scanner, but will return if the underlying problem has not been resolved. Permanent deletion is only possible by repairing the cause.

Can an empty tank trigger the error code P1662?

A very low fuel level can actually cause trouble code P1662, as the fuel pump then draws in air and overheats. Always refuel in good time and never let the tank run completely empty.

What tools do I need to diagnose P1662?

To diagnose EOBD code P1662, you need an OBD scanner, a multimeter for voltage measurement, a fuel pressure gauge and basic tools. More complex repairs should be carried out by a specialist workshop.

Vehicles in which error code P1662 occurs most frequently

Error code P1662 is a manufacturer-specific DTC and can indicate various fuel system problems, but is most common in the following vehicles:

BMW: 3 Series E46, 5 Series E39, X3 E83, X5 E53 (1999-2006)
Mercedes-Benz: C-Class W203, E-Class W211, S-Class W220 (2000-2007)
Audi: A4 B6/B7, A6 C5/C6, A8 D2/D3 (1998-2008)
Volkswagen: Golf IV/V, Passat B5/B6, Touareg (2000-2009)
Ford: Focus, Mondeo, Galaxy (2001-2008)
Opel: Astra G/H, Vectra B/C, Zafira A/B (1999-2010)
Renault: Megane II, Laguna II, Scenic II (2002-2009)
Peugeot: 307, 407, 607 (2001-2008)

If code P1662 occurs in your vehicle, you should first check the fuel pump relay, as this is often the cheapest solution. However, in the event of more complex problems with the fuel pump or the control unit, a visit to a specialist workshop is essential to prevent further damage to the engine and to ensure road safety.

How to change front wheel bearing on MERCEDES-BENZ M W163 TUTORIAL | AUTODOC

151K views

Published on: 26/07/2018
How to change fuel filter BMW 3 (E90) [TUTORIAL AUTODOC]

241K views

Published on: 17/04/2019
How to change Front wheel bearing on VW GOLF 4 TUTORIAL | AUTODOC

177K views

Published on: 26/07/2018
How to change a rear brake pads FORD FOCUS 3 TUTORIAL | AUTODOC

169K views

Published on: 27/07/2018
How to change pollen filter / cabin filter on AUDI A6 (C6) [TUTORIAL AUTODOC]

150K views

Published on: 25/10/2019
How to change engine thermostat on PEUGEOT 207 [TUTORIAL AUTODOC]

147K views

Published on: 09/12/2020
How to change fuel filter NISSAN X-TRAIL T30 TUTORIAL | AUTODOC

139K views

Published on: 27/07/2018
How to change front wheel bearing TOYOTA YARIS XP10 TUTORIAL | AUTODOC

120K views

Published on: 26/07/2018

How to change serpentine belt on MERCEDES-BENZ A-Class (W169) – replacement guide

Free download PDF
1.38 MB
How to change engine oil and filter on BMW 1 Hatchback (F20) – replacement guide

Free download PDF
1.62 MB
How to change engine thermostat on VW Golf VI Hatchback (5K1) – replacement guide

Free download PDF
4.12 MB
How to change water pump & timing belt kit on Ford Fiesta JA8 – replacement guide

Free download PDF
7.83 MB
How to change front strut mount on AUDI A1 Hatchback (8X1, 8XK) – replacement guide

Free download PDF
3.8 MB
How to change water pump & timing belt kit on Peugeot 307 SW – replacement guide

Free download PDF
7.01 MB

Want to get more useful information?

Ask questions or share your repair experience on the car forum. Subscribe to updates so you don't miss out on new guides.

Ask on the forum

#DIY Guide: How to Fix a Cracked Windscreen Without a Garage Visit

9K views

Published on: 14/12/2023
5 easy car repairs you can do without a garage visit

5K views

Published on: 09/10/2025
Kolbenschmidt plastic gauge overview

3K views

Published on: 23/04/2025
Don’t Replace, Just Polish! Headlight Restoration with AUTODOC

9K views

Published on: 13/01/2021