BMW 540i ECM-Power Relay Replacement at your home or office.

Our mobile mechanics offer services 7 days a week. Upfront and transparent pricing.

Estimate price near me

Service Location

Customer Ratings

(60)

Included for free with this service

Online Booking

Mechanic comes to you

12-month / 12k-mile warranty

Free 50 point safety inspection

Our certified mobile mechanics can come to your home or office 7 days a week between 7 AM and 9 PM.

Customer Ratings

(60)

ECM-Power Relay Replacement Service

How much does a ECM-Power Relay Replacement cost?

On average, the cost for a BMW 540i ECM-Power Relay Replacement is $113 with $18 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2003 BMW 540iV8-4.4LService typeECM-Power Relay ReplacementEstimate$177.35Shop/Dealer Price$210.44 - $270.34
2002 BMW 540iV8-4.4LService typeECM-Power Relay ReplacementEstimate$157.35Shop/Dealer Price$190.47 - $250.39
2017 BMW 540iL6-3.0L TurboService typeECM-Power Relay ReplacementEstimate$130.95Shop/Dealer Price$149.96 - $184.44
1999 BMW 540iV8-4.4LService typeECM-Power Relay ReplacementEstimate$157.35Shop/Dealer Price$190.43 - $250.32
2000 BMW 540iV8-4.4LService typeECM-Power Relay ReplacementEstimate$157.35Shop/Dealer Price$190.50 - $250.44
1994 BMW 540iV8-4.0LService typeECM-Power Relay ReplacementEstimate$193.35Shop/Dealer Price$235.47 - $322.39
1995 BMW 540iV8-4.0LService typeECM-Power Relay ReplacementEstimate$198.35Shop/Dealer Price$240.23 - $326.97
1997 BMW 540iV8-4.4LService typeECM-Power Relay ReplacementEstimate$162.35Shop/Dealer Price$195.89 - $256.11
Show example BMW 540i ECM-Power Relay Replacement prices

What is the ECM-Power Relay all about?

Vehicle development has evolved over the past several decades to a point where it seems every vehicle function is controlled by a computer, right down to the engine itself. This is actually the case for the engine and its related functions as it is controlled by the engine control module, or ECM. The ECM monitors and adjusts operation and power distribution to the fuel supply and injection systems, engine timing, exhaust gas recirculation, emissions, ignition system, and several other systems. In order to dispense power to operate these other systems, the engine control module requires power itself.

The power distribution center, or fuse block, located under the hood houses most or all of the vehicle’s fuses and relays. It contains a relay for the ECM that is powered up when the ignition key is turned to the on position. This ECM power relay acts as a switch that supplies power to the ECM. When the ignition is turned off, power switches inside the ECM relay and it no longer receives battery power. If the ECM power relay stops switching as it should, you will experience vehicle problems. When the relay is stuck open, no power will be delivered to the engine control module and the vehicle won’t start. If the relay is stuck closed, constant power will be sent to the ECM even with the engine turned off and the battery will drain.

Keep in mind:

  • The battery should be disconnected any time the electrical system is being serviced.
  • There are several problems which can cause your vehicle not to start, with the ECM power relay being one of them. Have the problem diagnosed by one of our expert technicians.

How it's done:

  • The ECM-power relay is verified that it needs to be replaced. The relay is located in the engine main fuse relay control box.

  • The defective ECM-power relay is removed from the control box by pulling it straight up and out of socket.

  • The new ECM-power relay is installed into the socket and the engine scanned for codes.

  • The engine is started and the ECM-power relay is tested for proper operation.

  • The vehicle is road tested for proper operation of the ECM-power relay and is then checked for codes.

Our recommendation:

The ECM power relay should last the lifetime of your vehicle unless there is a power distribution problem or moisture that causes it to fail. If your vehicle won’t start, have one of our expert technicians diagnose the problem and replace the ECM power relay if necessary.

What common symptoms indicate you may need to replace the ECM-Power Relay?

  • Engine will not start when the key is turned.
  • Engine doesn’t turn over when ignition is on.
  • Check Engine light is on.
  • Battery drain which may leave it weak or dead.

How important is this service?

Although it is extremely unlikely the ECM relay will cause your vehicle to stall or create a safety concern, your vehicle may not start or the battery may die while the ignition is off. In either case, you will need to replace the ECM relay.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert BMW mechanics

Real customer reviews from BMW owners like you.

Excellent Rating

(60)

Rating Summary
56
3
0
0
1
56
3
0
0
1

Pardeep

21 years of experience
1085 reviews
Pardeep
21 years of experience
BMW 540i V8-4.4L - Radiator - San Jose, California
I had a positive experience, he was very familiar with my car. Repair was completed satisfactorily and many thanks that I can once again get my 2001 BMW back on the road. For regular maintenance , I won't hesitate to repeat another service. Thanks again!

Joshua

27 years of experience
709 reviews
Joshua
27 years of experience
BMW 540i V8-4.4L - Fires right up, and then it is like I turn off the key. Good gas pressure, new gas pump/ filter. UBDII code p0120 throttle position sensor. Replaced throttle body with potentiometer attached to it, replaced gas pedal potentiometer with no change. Car stalling inspection. - Fairfield, California
Joshua was a very pleasant and hard working person. He was very instructive and his diagnostic approach was very thorough. I would recommend him to Anyone as his demeanor and conduct were both professional and enjoyable.

Lucas

21 years of experience
887 reviews
Lucas
21 years of experience
BMW 540i V8-4.4L - Water Pump - Simi Valley, California
Lucas was very friendly and courteous. He arrived on time and replaced the water pump and the thermostat on my car with great care and attention to detail. He did an outstanding job and took the time to explain everything I needed to know. I'm very pleased with his performance and will definitely be using his services in the future as well as recommending "yourmechanic.com" to my family and friends.

Gary

27 years of experience
226 reviews
Gary
27 years of experience
BMW 540i V8-4.4L - Battery - Richmond, California

Excellent Rating

(60)

Rating Summary
56
3
0
0
1
56
3
0
0
1
Number of BMW 540i services completed
660+
services done by our mechanics
TOTAL NUMBER OF EXPERT BMW MECHANICS
1100+
experts on our platform

Recent articles & questions

How to Know When It's Time to Buy a New Car
Deciding whether to repair or replace your car can be tough. Find out the value of your car and get an estimate for repairs before you get a new car.
Veteran and Military Driver Laws and Benefits in Illinois
The The state of Illinois offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch in the past, or are current active military members. Reduced fee license plate While Illinois does...
P0767 OBD-II Trouble Code: Shift Solenoid D Stuck On
P0767 code means there is an abnormality detected in shift solenoid "D" often due too transmission blockages or low/dirty fluids.

My engine will start, but it idles rough and then stalls out.

Hi there. Getting into an accident, may have created a poor electrical connection (https://www.yourmechanic.com/services/electric-problems-inspection) in the engine management system. Starting the engine, having a rough idle (https://www.yourmechanic.com/services/car-idle-is-rough-inspection) and stalls (https://www.yourmechanic.com/services/car-is-stalling-inspection) could be any number of component failures. Identifying whether there...

I have engine light on my hhr chev 2009 they said at autozone that it gave a code of p0010. what does this mean and how much does 2009 Chevrolet HHR

Hello. Most of the time this is caused by a bad camshaft actuator. It can also be caused by low oil or an internal engine problem but most of the time it is the solenoid itself. If you need to...

Coolant leaking outside on front passenger side

It sounds like your coolant overflow tank may be leaking as this is where it is usually located underneath the hood of the vehicle. If the leaking only occurs after driving the vehicle, it is likely that the radiator is...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (844) 997-3624 · hi@yourmechanic.com