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Check engine and low power lights are on

Tiny
RONBOW64
  • MEMBER
  • 2003 ISUZU RODEO
  • 3.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 220,000 MILES
Check engine lights on and low power lights. I cannot drive it more than 25 miles an hour.
Monday, November 26th, 2018 AT 7:28 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Hi and thanks for using 2CarPros.

The first thing you need to have done is scan the computer for trouble codes. That will guide us to what is causing the problem. Many things can cause it.

First, here is a video that shows how to check for trouble codes:

https://youtu.be/YV3TRZwer8k

Next, here is a link that describes common causes of low power:

https://www.2carpros.com/articles/symptoms-of-low-engine-power

https://www.2carpros.com/articles/engine-has-low-power-output

If you are able to scan the computer, let me know what codes you find. Take a look through the links I added. Something very simple may be the problem. Also, if you have other questions, let me know.

Take care,
Joe
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Monday, November 26th, 2018 AT 1:44 PM
Tiny
RONBOW64
  • MEMBER
  • 4 POSTS
Okay, start with the ground on top of the engine every ground and on top that I could find I tightened up was driving fine made it a day and the check engine light and low power came on again I am baffled. I ran a code check P1125, P1295, P1515, PO602. I am pulling my hair out trying to figure out what is going on. Replaced the fuel filter that looked original I just gave it a tuneup not to long ago I might be 200 miles over my oil change I have not had time to go. I have watched a few YouTube on this problem and I guess my next step is to find the grounds underneath. Then clean them up. Next Is the wiring harness. I just had my timing belt replaced. It all comes in a kit brand new water pump so I am baffled I just had a crossover put on. I have a lot of money in this car and I really do not want to get rid of it. I own my own business and I Kind of do not have the cash to buy new car. One of the YouTube videos I watched said it could possibly be compression, but the day that it ran it ran absolutely the best it has ever ran. So I am at a loss. So if you have any more suggestions I would appreciate it, thanks.
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Saturday, December 1st, 2018 AT 3:47 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Welcome back:

Honestly, the P0602 indicates a programming error in the PCM. The remaining codes point to the reduced power and throttle issues. All of the following errors are most likely the result of the PCM.

P1125 indicates fail safe mode ( no power issues)

P1295 indicates power saver mode ( no power issues)

P1515 throttle position correlation error. (No power issues)

At this point, and I hate to say it, I feel the PCM may either need reprogrammed or replaced.

Joe
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Saturday, December 1st, 2018 AT 6:27 PM
Tiny
RONBOW64
  • MEMBER
  • 4 POSTS
What is a PCM n where is it?
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Monday, December 3rd, 2018 AT 10:37 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
PCM stands for power control module. It is basically a computer. The PCM supplies either 5 or 12 volts to power various sensors or switches throughout the vehicle. When it fails, many different things can happen.

It is located under the hood near the air box. I attached a picture for you to see it.
Image (Click to make bigger)
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Monday, December 3rd, 2018 AT 5:35 PM

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