Question about 1993 GMC Sonoma Club

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1993 GMC Sonoma speedometer recalibration? What tools and/or equipment is necessary? I installed a Dakota Digital speed sensor on the mechanical speedometer drive. The speedometer works now, but shows about about 10x too slow (e.g. at ~60 mph it shows ~6 mph!) The odometer is working now too, but also shows 1/10 the miles traveled. I'm running 215/75-15 tires. I want to recalibrate the ECM to be closer to actual. (Recently bought the truck - it appears to be a collection of Sonoma/S-10 parts, thought the title & VIN says its a 1993.)

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Posted on Jan 02, 2017

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SOURCE: 1993 GMC 1500 4x4 poor shifting

this may be due to a poor connection at the vehicle speed sensor on the transmission, pull the connector off the sensor and clean it with contact cleaner, if the problem persists replace the speed sensor. there are 2 diff ones here is a picture of the most common one for an auto trans.3deea43.jpg

Posted on Mar 26, 2009

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SOURCE: 2001 GMC Sonoma Ext cab 4.3l, quit while running

Pull plug wire and install a philips screwdriver into the plug wire get it 1/4 inch away from a good ground and crank the engine over, is there spark? if so check that you have fuel pressure buy renting a fuel pressure test kit from schucks or auto zone and turn the Key to run position with the gage hooked up, it should read 50 PSI turn key off and wait 20 seconds should still have 20 PSI of fuel pressure, if no fuel pressure check fuel pump relay, then check fuse to pump. if you have a bad relay and are not getting fuel then check the oil pressure switch to see if you have oil pressure at the switch if no pressure then the oil pressure safety switch has died and needs to be replaced and should stark after replacing. If you have fuel then check the timing to see if you slipped timing belt.

Posted on Jun 12, 2009

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SOURCE: ecm on 2000 sonoma s10

napa has them on the shelf re manufactured already for 150 to 200 dollars. best quality i have used in after market parts. always have problem with auto zone stuff so i don't even bother no more. good luck

Posted on Oct 08, 2009

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SOURCE: the speedometer on my 04 gmc sierra is stuck

Sadly, no. What has happened is that the tiny servo motor that moves the speedometer needle is failing. When I run into these we remove the dash assembly and send it out to be repaired, usually by a dealer although there are other companies that can do this too. Usually they replace all the servo motors and backlight bulbs during the repairs but make sure you ask if they do so just to be sure.

Posted on Jul 05, 2010

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SOURCE: I have a 2005 GMC yukon and the speedometer is way off

This is really common on the 03-06 Yukon instrument clusters. It's caused by failing stepper motors on the circuit board and can be repaired. Check out this page for more about it and how to get it fixed - Yukon instrument cluster repair

Posted on Sep 29, 2010

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2000 GMC Jimmy 4×4 The ABS light is on, the speed odometer does not work, and it does shift out of 1st gear, if I manually put it into second gear then it will shift fine, it has a changed VSS

Did you have it check for DTC'S - diagnostic trouble codes ?
The speedometer is an analog gauge that is located in the instrument cluster. The PCM/VCM receives an analog input from the vehicle speed sensor and converts it to a digital signal containing 4,000 pulses per mile (PPM) for the instrument cluster.
The PCM/VCM sends this digital output (4,000 PPM) to the instrument cluster on a designated circuit. These pulses can be measured in Hertz (Hz) using a digital multimeter (DMM) on the AC scale. The PCM/VCM calibration is matched to the final drive and tire size of each vehicle. If the final drive or tire size is changed for any reason, the PCM/VCM must be updated in order to match the new final drive or tire size. If not, the signal will not be accurate for proper speedometer/odometer operation. An incorrect signal can affect the antilock brakes and the cruise control systems.
The speedometer system consists of the instrument cluster, vehicle speed sensor (VSS), PCM/VCM and related wiring. The VSS is a permanent magnet signal generator that sends an analog signal proportional to the propeller shaft speed to the PCM/VCM. The VSS mounts to the transmission tailshaft extension housing on 2-wheel drive (2WD) models and the transfer case output shaft housing on 4-wheel drive (4WD) models.
Repairs to the instrument cluster can only be performed by an authorized instrument cluster service center. DTC P0502 Vehicle Speed Sensor (VSS) Circuit Low Input and DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent in Automatic Transmission - 4L60-E
- DTC P0500 Vehicle Speed Sensor (VSS) Circuit in Engine Controls - 4.3L Important: If the instrument cluster is completely inoperative, refer to Instrument Cluster Inoperative .
Install a scan tool.
Raise the vehicles drive wheels. Refer to Lifting and Jacking the Vehicle in General Information.
Start the engine.
Place the transmission into drive for automatic transmission and third gear for manual transmission.
Compare the displayed vehicle speed on the Instrument Cluster with the monitored speed on the scan tool.
Does the vehicles speedometer and the scan tool both display 0 km/h (0 mph)? You really need a Factory scan tool or equivalent to check this . The VSS is an input to the PCM/VCM . engine computer . You can test with a DVOM - digital volt ohm meter , for signal to engine computer .
I know most people don't like hearing this , but I suggest you take it to a ASE certified repair facility .

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Are you going to attempt this yourself? 1. Purchase a Chilton or Motors manual for the '93 Sonoma and see if this repair is something you feel equipped and prepared to perform. If so, you'll be taking components off the front of the engine (possibly removing the radiator, too), and you will need some special tools as well. Then follow the procedure outlined in the manual TO THE LETTER.

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1993 GMC 1500 4x4 poor shifting

this may be due to a poor connection at the vehicle speed sensor on the transmission, pull the connector off the sensor and clean it with contact cleaner, if the problem persists replace the speed sensor. there are 2 diff ones here is a picture of the most common one for an auto trans.3deea43.jpg

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