For 1990-2009 cars

# ABS Front Wheel Speed Codes Jumper Harness - kw booster brake C1221 C1222 C1223 C1225 C1226 C1232 C1233 C1252 C1253 caliper DTC EBTCM electrical grab ground hydraulic hydroboost

Subject: | ABS Front Wheel Speed Codes - Jumper Harness

Models: | .

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

### Condition/Concern:

91 - 05 JB, NB, or LB vehicles may set any one or a combination of front wheel speed sensor ABS codes as intermittent or hard failures.

### Recommendation/Instructions:

If after inspection and diagnosis, using the applicable trouble tree(s), the cause of the fault is not readily identified, the most probable cause is often the wheel speed sensor jumper harness. Oftentimes, the harness checks good with the J 39200 fluke meter but will not function correctly when subjected to suspension movement, vibration, and flexing. Seldom will the above condition be corrected by the replacement of the EBCM. The listed part numbers are leads that incorporate a highly flexible "angel hair" that reduces down to standard gauge wire so that it may be properly spliced into the existing circuit. Standard gauge wire should not be used in place of these part numbers.

YEAR | Left | Right
--- | --- | ---
PART NUMBERS BY BODY LINE--J BODY |  |
92 | 12140077 | 12140078
93* | 12128505 | 12128504
| or 12140077 (Jumper Harness) | or 12140078
| ***NOTE***93 J-Body had 2 designs available -- a conventional "splice-in" design" or a complete 2-wire jumper harness. Inspect vehicle to determine which design is needed. |
94 | 12128505 jumper harness | 12128504 jumper harness
95-05 | 12187091(same P/N, Left or Right) Note: Visually Inspect the wheel speed sensor harness connectors and yellow wire to see if it is unseated from the connector. This is especially important on the left hand side. If the wiring is faulty, replace the harness with the above part numbers. | 12187091
PART NUMBERS BY BODY LINE - N BODY |  |
91 | 12091371(same P/N, Left or Right) | 12091371
92-98 | 12140077 | 12140078
99-05 | 12167654 | 12167653
P-90 (97-03 MALIBU/ CUTLASS and 04 CHEV CLASSIC): |  |
97-04 | 12167654 | 12167653
PART NUMBERS BY BODY LINE--L BODY |  |
92-96 | 12140077 | 12140078

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

### Models:

(1992-2005 CHEVROLET CAVALIER) and (1992-1994 PONTIAC SUNBIRD) and (1995-2005 PONTIAC SUNFIRE) and (1991-2005 PONTIAC GRAND AM) and (1991 OLDSMOBILE CUTLASS CALAIS) and (1991-1998 BUICK SKYLARK) AND (1992-1998 OLDSMOBILE ACHIEVA) AND (1999-2004 OLDSMOBILE ALERO) AND (1997-2003 CHEVROLET MALIBU) AND (2004 CHEVROLET CLASSIC) AND (1997-1999 OLDSMOBILE CUTLASS) AND (1992-1996 CHEVROLET BERETTA) AND (1992-1996 CHEVROLET CORSICA)

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