2nd Gen Non-Engine/Transmission 98.5 2500 ABS/Berake IP light

[PaulLO]

With 54K miles, the ABS & Brake light came on dthe IP. Codes P1693 & P0622 set. Fuses F3 in the cab and the 40 amp fuse in power distribution under the hood OK. Any ideas on the best place to start trouble shooting other than replacing sensors on diff amd front wheels? Thanks, PaulLO

 

[B.G. Smith]

The sensor in the diff. also sends signal to speedo, if speedo isn't jumping around the problem is most likely elsewhere. bg

 

[PaulLO]

Problem solved. Was putting on new exhaust, 4" turbo back from Geno's, (spare tire down); decided to replace the diff sensor (also from Geno's). Job complete: new diff sensor solved the ABS/Brake IP error light. Thanks for the reply B. G. Smith. PaulLO

 

[GSP7]

For future ref , you should only have rear wheel ABS , no sensors on front. Least thats how my '99 is