Going into limp mode

MATT QUINN

MEMBER
2004 ISUZU TRUCK
6 CYL
TURBO
RWD
MANUAL
250,000 MILES

When driving along, the trucks service light on dash comes on and drops in speed. When turned off and back on it will run fine for about a km then does it again. Have tried disconnecting battery's to reset computer, but yet again it still continues.

3 Replies

STEVE W.

MECHANIC
13,442 POSTS

You need to get it scanned for the codes that are causing the light to come on. Without those it is all a shot in the dark.

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Friday, January 13th, 2017 AT 3:04 AM

LOU P

MECHANIC
118 POSTS

Steve is correct, without a code it is hard to tell what can be happening. At first guess it sounds like you may have a speed sensor issue, but without a code we would not know where to begin. We have videos on how to retrieve codes you should take a look. Lou.

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Friday, January 13th, 2017 AT 8:53 AM

RENEE L

ADMIN
1,260 POSTS

Hi MATT QUINN,

Here is a link to the code scanning information from this site Lou P mentioned in his post. It features written step by step instructions and pictures explaining how to do the scan yourself. also, I have included a link to our YouTube channel with a how to video on code scanning.

This is applicable even if your check engine light is not on.

Most scanners are inexpensive to purchase, you can purchase one online from sites like Amazon.com

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://youtu.be/YV3TRZwer8k

Once you have the codes please get back to us so that we can further assist you. We are always happy to help.

Thank you for visiting 2CarPros.com.

Kindest regards,

Renee
Admin

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Friday, January 13th, 2017 AT 12:08 PM