Question about 2003 Chevrolet Suburban 1500

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Low engine power displays and in fact the vehicle barely moves

2003 Suburban barely moves under its own power. Low engine power is displayed.

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  • carlyle95 May 06, 2009

    mine did the same thing. i found a sensor on the front right side of the engine that had worked lose after resecuring it the problem went away, but not sure if they were connected but may be worth looking into.

  • Anonymous Mar 20, 2014

    low engine power and stalls



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I had the same problem with my 2003 suburban and it was the battery ,bought a new one and it fixed it right up. hopefully it will be the same with yours

Posted on May 17, 2009

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Could be the fuel pump in the Gas tank. Mine crapped out and caused the car to have reduced power for awhile before it quit all together.

Posted on Apr 30, 2009


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Parking brake pedal still goes to the floor and parking brake barely holds the vehicle 2003 suburban

There are things you need to check:
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Jul 23, 2016 | 2003 Chevrolet Chevrolet Suburban 1500 LS

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2003 4500. Why have gauges stopped working?

You could have anyone of a number of different problems . I know your year vehicle falls in the range of GM instrument culster problems . There are little stepper motors ( electric motors ) that make the gauges move . There could be DTC'S - diagnostic trouble codes stored in the instrument cluster . An you have to know how the instrument cluster knows how much to move the needles on the gauges . All the input sensors to the PCM/ECM - engine computer vehicle speed sensor , fuel pressure , oil pressure , etc... All the modules on the truck are hooked together on a serial data communication network .The PCM/ECM sends this information out on the data bus for the other moduels that need the info .
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The powertrain control module (PCM) creates the vehicle speed signal by pulsing the signal circuit to ground at a rate of 4K PPM. The instrument panel cluster (IPC) converts the 4K PPM signal to a speedometer position. The IPC also receives a class 2 message from the PCM indicating the vehicle speed. The IPC uses this class 2 message for diagnostic purposes.
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The instrument panel cluster (IPC) uses the ignition 0 voltage circuit in order to supply voltage to various indicators and gages. The IPC also receives a class 2 message from the serial data gateway module (SDGM) indicating the current power mode. Your best bet would be to take your vehicle to the Dealer or an ASE certified independant repair shop .

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Reduce power light on has no throttle and keeps giving throttle accuator cdes

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Transmission over temp display. what does this mean?

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Jan 18, 2013 | 2005 Jeep Grand Cherokee

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1999 gmc suburban O2 sensor fuse Keeps displaying the P0157 bank 2 sensor 2 code even after having replaced it with new.

Bank two, sensor one, is on the back of the engine, closest to the firewall. People report that it isn't easy to change unless you have access to a vehicle hoist. It's easier to get at it from under the car. ------------------------------------------------------------------------------------
renault can clip

Jan 05, 2013 | Cars & Trucks

1 Answer

On a 2003 Suburban, the dash display reads 25% remaining, but the oil stick is not showing any oil. I was told the dipstick actually will only show 2 quarts low. Is this accurate?

i belive that it means the oil life is 25% remaining if you cant see oil on the end of the dip stick you are two or more corts low check every month to see if you are loosing alot or just a little

Apr 11, 2011 | 2003 Chevrolet Suburban 1500

1 Answer

We have a 2003 chevy suburban 5.3 vortec it dies when warmed up

Sounds like either Air mass sensor, Air mass meter or finally the EGR valve this is the exhaust gas recycler I would say that is the fault when they start to go this is what they do until finally the car will barely move.

Also I would check all your air pipes for leaks make sure there is no rips or tears in the pipes, The car will drive fine like you say until you ease of the gas to a stop position it **** in to much air and kills the engine. Air faults are cheaper so look there first.

Hope this helps


Jan 31, 2010 | 2003 Chevrolet Suburban 1500

1 Answer

2005 suburban stabilatrac disabled

The Reduce Engine Power problem on my 03 Suburban went away when I had to replace the fuel mixing sensor. I damaged the sensor by topping off with E85 (ethanol) by mistake late at night. The vehicle just would not turn on in the morning. The vehicle had to be towed to the dealer. I was in Carlsbad NM about 800 miles from home. I had no choice but to pay $1,100 to get it fixed. At the same time the Reduce Engine Power problem went away. And thanks to God it has not come back for nine 9 months now.

Aug 12, 2009 | 2003 Chevrolet Suburban 1500

2 Answers

Trying to locate MAF sensor on 2003 suburban 1500 to check/clean as solution to engine performance and PO171/174 code displayed on personal diagnostic scanner.

Look near your A/C system and under the overflow hose for the coolant. It is a round can looking thing with a small wiring harness attached on top. There rae 3 hex screws holding it on to the bracket. Remove these and slip it off of the air intake tube. Use a small screwdriver to depress the small latch on the inside of the harness and gently pull it off. Disassemble the MAF sensor from the mounting plate, remove it from the vehicle and spray the wires with carburetor cleaner several times. That should clean it up for you. Good luck and let me know if you need more info.

Jan 18, 2009 | 2003 Chevrolet Suburban 1500

1 Answer


Display reads "Engine Power Reduced" and sometimes won't accelerate beyond idle. Other times it accelerates normally. We have not yet noticed a pattern.

Jul 01, 2008 | 2003 Chevrolet Suburban 1500

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