Saab P1870: Transmission Component Slipping

Is your scanner showing Saab P1870?
No worries. We'll show you what it means and how to deal with it.

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Saab P1870: Transmission Component Slipping

DIY Difficulty Level
Repair Cost
Can I Still Drive?
Yes (Short-term only)

What Does The Saab P1870 Code Mean?

Vehicle driven at a speed of 30-70 MPH at an engine speed of 1500-3000 RPM, Fuel Cutoff inactive, TP angle from 9-35%, engine vacuum 0-150 kPa, speed ratio is 0.69-0.88, Transmission not 1st gear, gear range is D4, TFT sensor from 68°F-266°F, shift solenoid diagnostic counter at zero, then with the TCC solenoid commanded “on” at a 95% duty cycle for 5 seconds, the ECM detected the TCC slip speed was 130-180 RPM for 7 seconds. The fault must be detected three times with the TCC commanded “off” each time between cycles.

What Are The Potential Causes Of The Saab P1870 Code?

  • 1-2 shift solenoid valve has sediment, damage or leaking seals
  • 2-3 shift solenoid valve has sediment, damage or leaking seals
  • 3-2 shift solenoid valve has sediment, damage or leaking seals
  • Valve body regulator apply valve stuck or regulator is scored
  • Torque converter front stator shaft bushing is worn, the stator roller clutch is not holding or it has external damage/leaks
  • Converter clutch valve is stuck or it is installed backwards
  • Converter clutch valve retaining ring is not positioned properly
  • Converter clutch outer valve spring is cocked
  • Pump to case gasket is not positioned properly
  • Orifice cup plugs are restricted or damaged
  • Over-tightened, or unevenly tightened pump body to cover bolts
  • TSB 02-07-30-001 contains a repair procedure for this code

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> Saab ATP Shift Solenoid
>>> Automatic Transmission Torque Converter Clutch Valve, Auto Transmission Shift Control Solenoid Valve

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

Technical Service Bulletin PIP5094 for P1870

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