99 Chev.2500 5.7 L engine I is blowing 20 amp ecm fuse when you turn ignition switch on

Chris Cassada

Asked by Jan 16, 2015 at 06:01 PM

Question type: Maintenance & Repair

1 Answer


Your 1999 Silverado has two ECM fuses in the underhood fuse block, the ECM 1 fuse which feeds power to the ignition coil, ignition control module, crankshaft position sensor, and fuel injectors and the ECM B fuse which feeds power to the fuel pump via the fuel pump relay before the engine starts and the oil pressure/fuel pump switch after the engine starts. Depending on which ECM fuse is blowing, look for a short in the circuits it powers by unplugging those items, replace the fuse, and then plug each item in until you find the circuit which is blowing the fuse.

Your Answer

Add photo

Related Questions

  • ECM -1 FUSE BLOWING 10 answers

    Hi, I own a 1999 chevy Tahoe with a 5.7 engine. Driving on the highway tuesday morning the truck went dead with no warning. I initialy thought it was the fuel pump but noticed the blown 20 amp ECM - 1...

    1999 Chevrolet Tahoe 4 Dr LT 4WD SUV


    Maintenance & Repair

  • My 99 suburban Ecm-1 fuse keep blowing 15 answers

    1999 Chevrolet C/K 1500


    Maintenance & Repair

  • 10 amp ac fuse blows instantly even when ac is off 2 answers

    I have a 1993 toyota 4 runner automatic with 3.0 engine. The 10 amp fuse behind glove box instantly blows when putting in a new one. The green light on switch is never on, I have reversed heater and...

    1993 Toyota 4Runner 4 Dr SR5 V6 4WD SUV


    Maintenance & Repair

  • ignition c fuse draws 2amps with switch off WHY 1 answer

    When ignition is turned off battery goes dead after a few days draws about 2 amps when switch is off

    2002 Chevrolet Suburban 2500 LT 4WD


    Maintenance & Repair


Search Maintenance & Repair Questions

Maintenance & Repair Experts

#1 Tom Demyan
Tom Demyan
Reputation 146,270
#2 FordNut
Reputation 101,110
#3 dandyoun
Reputation 82,490
View All