55-50/51SN Common Problems After Remanufactured Valve Body Installation
Solenoid Wire Color Chart
| Solenoid | Connector Color | Wire Color |
|---|---|---|
| SLU | Black | 1 Green, 1 Brown |
| SLT | Blue | 1 Green, 1 Gray |
| SLS | Green | 1 Blue, 1 Red |
| S1 | Black | White |
| S2 | Black or Gray | Black |
| S3 | Gray | Yellow |
| S4 | Blue or Green | Purple or Red |
| S5 | Green, Red or Gray | Blue or Black |
- Shift Quality & Engagement Feel Concerns: This is a computer controlled transaxle that uses adaptive learn to adjust the shift feel and engagement timing. Whenever the transaxle is rebuilt, replaced, or if the valve body is replaced, the shift adapts must be cleared and relearned. The procedure is different for each manufacturer. Numerous engagement and shifting problems can remain after rebuild that the relearn procedure will correct. Most vehicles need computer software reflashes to correct specific shift & engagements problems.
- No 3rd Gear: Do NOT remove the big bolt on top of the transaxle - it is NOT for filling the transaxle; it is the band anchor bolt. Removing the band anchor bolt causes the band to fall out of position, resulting in no 3rd gear.
- Wrong Gear Starts/Delayed Engagements: It's not uncommon for solenoid wires to be installed on the wrong solenoids, especially the S1 switched with the S3. Do NOT go by the connector color, use the wire color chart.
- Assorted Solenoid Codes: Assorted solenoid codes occur when wires are pushed out of the harness side of the transmission connector on Volvos.
- Electrical Codes for the SLU, SLS & SLT Solenoids: These occur when spade connectors bend out of the way and create an open circuit or intermittent connection. Spade connectors are very thin and easily bent. Please use extra care when pushing wire connectors into place.
- Slips, Delays & Low Line Pressure: Please use care when installing the valve body so that the valve body to case gasket does not fold over and allow air into the suction side of the pump, creating low line pressure, slips and delays.
- 2-3 Flare: Most vehicles have a software reflash for this complaint. During transmission overhaul, shorten the servo travel to .1 00"-.125". Volvo also has an upgraded servo - see Volvo Bulletin # 43-37 dated 2-25-03. Air check the servo through the case to verify no leakage at the O-rings on the ends of the tubes.
Related Units
Related Parts
Required
Recommended
55-50SN, 55-51SN
Remanufactured Valve Body AW55GE
GM, Early, “A” or No Letter Casting. Also fits AF23/33 units.
Required
Recommended
55-50SN, 55-51SN
Remanufactured Valve Body AW55GL
GM, Late, “B” or “C” Casting, without B5 Spring. Also fits AF23/33 units.
Required
Recommended
55-50SN, 55-51SN
Remanufactured Valve Body AW55GMLSP
GM, ’05-Later, with B5 Spring. Also fits AF23/33 units.
Required
Recommended
55-50SN, 55-51SN
Remanufactured Valve Body AW55NL
Volvo/Nissan, ’05-Later, with B5 Spring. Also fits RE5F22A units.
Required
Recommended
55-50SN, 55-51SN
Remanufactured Valve Body AW55VE
Volvo, Early, “A” or No Letter Casting, without B5 Spring. Also fits RE5F22A units.
Required
Recommended
55-50SN, 55-51SN
Remanufactured Valve Body AW55VL
Volvo/Nissan, Late, “B” or “C” Casting, without B5 Spring. Also fits RE5F22A units.
While Sonnax makes every effort to ensure the accuracy of technical articles at time of publication, we assume no liability for inaccuracies or for information which may become outdated or obsolete over time.