Saab P1870: Transmission Component Slipping

Is your scanner showing Saab P1870?
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Saab P1870: Transmission Component Slipping

OVERVIEW

Severity

High

DIY Difficulty Level

Intermediate

Repair Cost

$200-$500

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