1999 GMC Jimmy Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 1999 GMC Jimmy

1999 GMC Jimmy Problems

ABS Light Due to Brake System Control Unit Failure

The Anti-lock brake system (ABS) control unit may fail internally causing the ABS warning light to illuminate.

Check Engine Light With Code P1870

Vehicles equipped whit a 4 speed automatic transmission may develop a harsh 1-2 shift and/or illumination of the Check Engine Light with code P1870 stored. This can be caused by wear of the bore for the TCC isolator and regulator valves in the valve body. This condition does not commonly occur until the transmission reaches normal operating temperature. If the valve body is worn, replacement will be necessary to correct this concern.

Fuel Level Sensor Failure

It is common for the fuel level sensor in the fuel tank read the fuel level incorrectly. The sensor must be replaced to correct the condition. Our technicians recommend having the complete fuel pump module replaced on high mileage vehicles.

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1999 GMC Jimmy Questions

Replaced radiator now runs and sounds like it is out of oil and it is full (2 answers)

I also hear a thumping noise when driving like a broken belt in one of the tires, but was told that it might be the wheel bearings.

Why my trans slips (1 answer)

My trans is fairly new rebuild .It is slipping and the speedometer bounces up and down and some times dont work .I can manual shift in 1st and 2nd but no 3rd or overxrive .I was told it may be a vss .Vehicle speed sensor .If u can please give me ur opinion which will greatly appreaciated.Thanks Ken

99' JIMMY 4.3 My 4wd was serviced and HAD FRONT DIFF. AND TRANSFER CASE REPLACED. now the service4x4, light is lot up full-time and 4 button selector , has no lights at all, EVER! (1 answer)

Just put speed sensors in transfer case, already . it went in for probs. W/ Jimmy not selecting w/ 4wd or2wd ID like
Then it would self cancel and after a while of clicking , would shut down and service 4wd would light up on dashboard

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1999 GMC Jimmy Reviews

My friend bought a 1999 Gmc Jimmy on a good buy ..She bought it in March 2014 since then we had to replace spiders for the fuel injectors,converter,ball joints, tires seem to leak was told cause they are aluminum .Not only that gas milage 13 to 16 when we were told it should get 17 to 22.body is in nice shape.but the truck is starting to be a nightmare,..
got my jimmy in march had some problems with 4 x4 replaced the 4x4 computer moduel located inside by passange door had no problems mine also tends to rock had to replace front end n shocks other than that ita a good buy
I have a 99 GMC Jimmy and it has been great. I carry a ton of sports gear in the back at all times. It tends to rock rather bad when I am driving on the interstate, but that is probably just the suspension from all the gear. The only big problem I have had is the 4x4 electrical buttons are all on and my 4x4 no longer works which is a bummer and my Jimmy acts like it wants to switch into 4x4 som...

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