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<H1>Allison LCT1000 Repeat TCM Failures with Possible Multiple DTCs - P0561 P0562 P1571 P1760 P0880 U1000 U2105 - adjust automatic DTC engage inoperative NSBU PRNDL shift slip switch transmission WIR #PI00938A - (06/23/2003)</H1>Allison LCT1000 Repeat TCM Failures with Possible Multiple DTCs - P0561 P0562 P1571 P1760 P0880 U1000 U2105 - adjust Allison automatic engage inoperative LB7 L18 NSBU PRNDL PQC shift slip switch TCM transmission


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When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms. <A name=ss1-1349563><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1349563&pubid=271&evc=sm#ss1-1349563" target="_blank">
<H5>Condition/Concern:</A></H5>


The Allison LCT1000 may experience a condition in the which the TCM has repeat failures. Any of the following (but not limited to) DTCs may be set: P0561 P0562 P0880 P1571 P1760 U1000 U1301 U1305 U2105. <A name=ss2-1349563><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1349563&pubid=271&evc=sm#ss2-1349563" target="_blank">
<H5>Recommendation/Instructions:</A></H5>


Using a DVOM check the resistance between male terminals 1 and 5 of the C1 connector (grey) at the TCM, with the wiring harness C1 connector removed from the TCM; if this measures to be an open, the TCM must be replaced. The negative battery cables must be checked for being loose.


The following grounds should be checked:


6.6 LB7 Diesel Engine


G104, G105 - Left Battery Ground


G102 - Right Battery Ground


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8.1 L18 Gas Engine


G100 G105 Left Battery Ground


G106 Right Battery Ground with 8Y9 or TP2


The Master Electrical Component List in SI provides ground location information
 
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