The engine light and transmission lights are blinking

Tiny
KC4509
  • MEMBER
  • 2006 ISUZU NPR
  • 5.2L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
I was driving on a cold rainy day and the engine light and transmission light started blinking. I pulled over and did not drive it. Do you think its my transmission?
Do you
have the same problem?
Yes
No
Tuesday, February 11th, 2014 AT 8:32 AM

19 Replies

Tiny
CARADIODOC
  • EXPERT
Very doubtful. The Engine Computer detected a problem, set a diagnostic fault code, and turned the Check Engine light on to tell you. The first step is to have the code(s) read. Many auto parts stores will do that for you for free. The codes will indicate the circuit or system that needs further diagnosis.
Was this
answer
helpful?
Yes
No
+1
Tuesday, February 11th, 2014 AT 2:46 PM
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2003 ISUZU NPR
  • 160,000 MILES
Codes retrieved are 11, 17, 19, 21. Transmission is still shifting but with elevated line pressure. Unable to delete codes and we have diagnostic trees to follow-up on except for the code 19. We are trying to isolate a common denominator between these. Any ideas in advance would be appreciated. I will post our tests and findings here. Thanks in advance.
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
KHLOW2008
  • EXPERT
You should start with one and follow up with test. I don't see any common denominator on the codes.
Like you, I am not able to find any reference to code 19.
Was this
answer
helpful?
Yes
No
+5
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
THATGUY420
  • MEMBER
I have a 2001 nqr with trouble codes 17 19 21 and 35 acts like its in limp mode. Any help would be great.
Was this
answer
helpful?
Yes
No
-1
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
MOTOR MASTER
  • EXPERT
Hello my name is Dave.

You didn't mention if your truck is gas or diesel, if it is a diesel it has the Asian transmission and that transmission has 2 speed sensors for that year. I have a lot of experience with the diesel version of this truck and if you could get back to us as to which one it is it would help us narrow the possibilities.

Either version are known for wiring issues, especially to the transmission. If it is the Asian transmission and your speedometer is not working the output speed sensor that give the speedometer it's signal is on the top left of the rear of the transmission just behind the transmission mount, it's a little tricky but it will come out with out removing the mount, however I would first check that the wire and plug appear to be in good condition, there is a pigtail that has a plug at each end and they are common to rub through and also for the plugs to become brittle and the pins back out.

If you could update us with the engine/transmission you have we will be able to assist you more accurately. We look forward to hearing back from you soon and thank you for using 2CarPros!
Was this
answer
helpful?
Yes
No
+1
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
DAYEE4LIFE@YAHOO.COM
  • MEMBER
Good morning Dave. I have a 2001 Isuzu NPR, it's diesel. It has 190,000 miles on it. There is a delay in shifting from 2-3 and 3-4! So when that happens I try to go easy on the accelerator pedal and then it shifts, but if I keep on pushing then it takes a little longer to shift.
No warning lights in the dash. No smell or any other obvious symptoms. I checked the transmission fluid and filled some as it was needed. Thank you for your time.
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
KEN
  • ADMIN
Hello,

Lets run the codes first. Here is a guide to help you do so:

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

Please run down this guide and report back.
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
KOPERNIK11
  • MEMBER
Hello,

I have 2004 NPR diesel.
My speedometer start acting weird go on and off or not working at all. At the same time I notice my transmission stop working correctly, switching gears up and down (sure because of fault speed reading) I was able to read codes
17, 19, 21, 24, 35. Dave you mentioned VSS also that there are 2 of them. Can you tell others location should check something else before replacing them?
Thank you
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
ST48430
  • MEMBER
  • 2003 ISUZU NPR
Transmission problem 4 cyl Two Wheel Drive Automatic 90000 miles

the check transmission light keeps flashing on dash, what do you suggest this means?
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
ADRIAN SLUGHTER
  • MEMBER
Mine did that and had no symptoms and somehow shifter got misalligned with linkage and was not completely in gear. Had to push down harder to get into gear.
Was this
answer
helpful?
Yes
No
-1
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
KEN
  • ADMIN
This is a common problem when the output sensor goes out which is inside the transmission. Here is the instructions to change it out in the diagrams below. Check out the diagrams (below). Please let us know what you find.
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
KEN
  • ADMIN
An error in the transmission control or sensing system has occurred and the transmission control unit is signalling the problem and a code. You need a scan to retrieve the trouble codes to proceed with troubleshooting.

Here is a guide to help you get started.

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

Please run this test and get back to us so we can continue helping you.

Cheers, Ken
Was this
answer
helpful?
Yes
No
+1
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
DYLAN COLE CAUDLE
  • MEMBER
Any updates on this having the exact same issue with one in my shop except I have blink codes 17, 19, 21, 31, 35 but this truck will only go into first gear if you manually put it in 1st other wise if you put it in drive it starts out in 2nd from what I can tell also I have a 2004 Isuzu npr diesel
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2001 ISUZU NPR
  • 150,000 MILES
What are the transmission trouble code definitions for this vehicle? When prompted, the CHECK TRANS light flashes codes, 11, 15, 19, 21, 24 & 35. Thank you in advance.
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Hello,

Is the speedometer working? These codes come on when the VSS goes out, you can tell for sure if the gauge does not work. The location of the sensor is near the drive shaft output from the transmission.

Please let us know what happens.

Cheers, Roy
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
JCGILLY
  • MEMBER
  • 2004 ISUZU NPR
  • 140,000 MILES
My automatic transmission oil temperature light is staying on, but the transmission fluid level is fine. Also, sometimes it goes off. Should I be concerned or is it a faulty sensor?
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
CARADIODOC
  • EXPERT
The temperature has nothing to do with level. If the light is on right after you start a cold engine, you know it is not overheating yet and you can suspect a defective sending unit or a wiring problem. If the light comes on after driving a while, a problem with an external transmission fluid cooler would be the most likely suspect.
Was this
answer
helpful?
Yes
No
+11
Wednesday, June 24th, 2020 AT 10:03 AM (Merged)
Tiny
DYLAN COLE CAUDLE
  • MEMBER
Yes, the speedometer is working.
Was this
answer
helpful?
Yes
No
Wednesday, June 24th, 2020 AT 6:43 PM
Tiny
KEN
  • ADMIN
I have seen the input shaft speed sensor cause this issue. Here is the location to so you can check it out. Check out the diagrams (below). Please let us know what happens.
Was this
answer
helpful?
Yes
No
Sunday, June 28th, 2020 AT 11:11 AM

Please login or register to post a reply.

Sponsored links