Question about 2000 GMC Sonoma Extended Cab

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1870 code transmission . rpm jump up and down when warm, but not all the time . 2000 gmc sonoma two wheel drive 2.2 4cyl. can you help

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You're dealing with one of the problems listed below:

A cracked or leaking TCC (torque converter clutch control) solenoid.

A cut, damaged or missing turbine shaft O-ring seal.

A converter clutch valve which does not have full travel of 1/2" or is stuck in the off position.

A slipping clutch or band.

Posted on Jul 24, 2009

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You might have a small vacuum leak. Check you PCV valve

Posted on Jul 24, 2009

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I don't know what that code is specifically, but the first thing I'd check for is a vacuum leak. So check all the little hoses running from the intake for leaks. Including the PCV and brake booster.

Posted on Jul 24, 2009

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RPM hunting is common symptom of vacuum leak. Look for cracked or disconnected vacuum hose.

Posted on Jul 24, 2009

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Oct 24, 2009 | 2000 GMC Sonoma Extended Cab

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Gmc sonoma voltage fluxuation & headlights dim at night


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Mar 04, 2009 | 2000 GMC Sonoma Extended Cab

3 Answers

GM service engine code P1870/2000 GMC Sonoma 2.2 cylinder


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
  • No TP sensor DTCs P0122 or P0123.
  • No VSS assembly DTCs P0502 or P0503.
  • No TCC solenoid valve DTC P0740.
  • No 1-2 SS valve DTC P0753.
  • No 2-3 SS valve DTC P0758.
  • No 3-2 SS valve assembly DTC P0785.
  • No TCC PWM solenoid valve DTC P1860.
  • The engine is not in fuel cutoff.
  • The engine torque is 40-400 lb ft .
  • The TP angle is 12-50% .
  • The vehicle speed is 56-112 km/h (35-70 mph ).
  • The speed ratio is 0.64-0.95 (the speed ratio is the engine speed divided by the transmission output speed).
  • The engine speed is 1500-3500 RPM .
  • 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.

May 16, 2008 | 2000 GMC Sonoma Extended Cab

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