Symptoms of a Bad or Failing ECM-Power Relay

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Cost of Replacing a Bad or Failing ECM-Power Relay

If there is no power when the key is inserted, the engine will not start, or the battery is dead, you may need to replace the ECM power relay. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for ECM-Power Relay Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2009 Saab 9-7x $92 $21.58 $70.00 29% $129.08
2005 Ford Ranger $113 $43.18 $70.00 24% $150.68
2006 Mitsubishi Galant $106 $35.98 $70.00 26% $143.48
2011 BMW 550i xDrive $88 $17.98 $70.00 29% $125.48
2015 Mercedes-Benz C400 $86 $15.58 $70.00 30% $123.08
2005 Maserati Quattroporte $118 $47.98 $70.00 24% $155.48
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How to Diagnose a Bad or Failing ECM-Power Relay?

ECM-power relay

The ECM, or electronic control module, is the computer responsible for controlling all of the engine management functions. It is the central control unit of most vehicles and controls a variety of functions, such as electrical system power distribution, emissions, ignition, and fuel systems. It is a very important, if not the most important component of a modern engine management system, and just the same as any other important electrical component it is powered through a relay.

The ECM power relay is the relay responsible for sending power to the ECM. If the relay fails, or has any issues, it can cause the vehicle to have all sorts of problems, and may even render it undriveable. Usually a problem with the ECM power relay will produce a few symptoms that can alert the driver of a problem that should be serviced.

1. No power when the key is inserted

One of the first symptoms of a problem with the ECM power relay is no power when the key is inserted. If the ECM power relay fails it can cut off power to the entire vehicle. A failed relay will disable the dash lights and warning chimes that normally come on when the key is inserted into the ignition, and will probably be unable to start or turn over the vehicle.

2. Engine will not start

Another common symptom of a problem with the ECM power relay is an engine that will not start or turn over. The fuel and ignition systems, as well as several other engine management functions, of many vehicles are controlled by the ECM. If the ECM or it’s relay fail, the entire engine management system will be left without power and will not function as a result. A bad relay may cause the vehicle to crank, but not start, or sometimes not even crank at all.

3. Battery drain or dead battery

A failed ECM power relay can also cause a battery drain or dead battery. If the relay shorts it can leave power on to the computer, even when the vehicle is turned off. This will place a parasitic drain on the battery, which will eventually cause it to go dead.

The ECM power relay is one of the most important relays as it provides power for the vehicle’s computer system. Without it the entire engine management system will be disabled and the vehicle will not run. For this reason, if you suspect that your ECM power relay may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the relay should be replaced.

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Recent ECM-Power Relay Replacement reviews

Excellent Rating


YourMechanic ECM-Power Relay Replacement Service

Average Rating

4.6/5

Number of Reviews

9

Rating Summary
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1
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Joel

18 years of experience
562 reviews
Joel
18 years of experience
Joel arrived on time and ready to get to work. His appearance is very professional and he is polite and knowledgeable. He determined the most likely cause of the issue (it's intermittent, so hard to diagnose for certain) quickly and made a follow-up appointment for the following morning, on a Sunday to replace the part. He is a very nice and personable man. I enjoyed meeting him and speaking with him.
1994 HONDA CIVIC - ECM-POWER RELAY - JACKSONVILLE, FLORIDA

Andrew

8 years of experience
394 reviews
Andrew
8 years of experience
So happy I chose this.. He was nice and very through.. Thank you Andrew 
2000 HONDA ACCORD - ECM-POWER RELAY - KANSAS CITY, MISSOURI

Richard

18 years of experience
451 reviews
Richard
18 years of experience
Phenomenal! He was very polite and courteous not to mention he really knew what he was doing! He explained everything to me in a way I could understand. So glad I called! I'll be referring Richard to all my friends and family. Should I ever run into car trouble again, I'm hunting Richard down! Lol... Keep up the good work and have a blessed day!
1995 FORD EXPLORER - ECM-POWER RELAY - AUSTELL, GEORGIA

Peter

40 years of experience
1059 reviews
Peter
40 years of experience
Excellent service as always!
2003 FORD EXPEDITION - ECM-POWER RELAY - WADDELL, ARIZONA

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