Question about 1999 GMC Sonoma

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I have a 2000 gmc sonoma with a 2.2l. truck shifts through all gears fine but in overdrive running at 55 or 60 the rpm will jump between 1800 and 2500 but runs most of the time at 2500. If i work the gas just wright it will drop to 1800 but will only stay there for a few seconds and then jump back to 2500. no engine light is on and the light does work. I can run the truck in 3rd and get the truck up to 50mph and push it in overdrive and i feel the truck shift and the rpm drop

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Sounds like TPS (Throttle Positioning Switch) They develop "hot spots" or wear spots usually at throttle positions that are commonly used alot IE: cruising speed. When they get hot spots they fluctuate looking for solid connection. Replace TPS.

Posted on Apr 04, 2011

  • jasabine Apr 06, 2011

    already done that. what rpm should it be at 55mph

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Posted on Jan 02, 2017

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you jave a biggie here.
here is some info
CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) monitors the difference between engine speed and transmission output speed. In D3 drive range with the TCC engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be -20 to +60 RPM .

When the PCM detects excessive TCC slip when the TCC should be engaged, then DTC P1870 sets. DTC P1870 is a type B DTC.

CONDITIONS FOR RUNNING THE DTC
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  • No 3-2 SS valve assembly DTC P0785.
  • No TCC PWM solenoid valve DTC P1860.
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  • The TP angle is 12-50% .
  • The vehicle speed is 56-112 km/h (35-70 mph ).
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  • The gear range is D4.
  • The commanded gear is not 1st gear
  • The TFT is between 20-130°C (68-266°F) .
  • The shift solenoid performance diagnostic counters are zero.

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