Question about 2003 Chevrolet TrailBlazer
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Posted on Jan 02, 2017
#PIT3138A: 02-05 Chevrolet, Buick, Oldsmobile and GMC Mid-Sized Utilities Reduced Power Light On and DTC P1680 P1221 and/or P1271 Stored in the PCM - kw fan clutch SES light power MIL 4.2 LL8 - (Nov 1, 2004)
The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.
Reduced power light on and DTC P1680 P1221 and/or P1271 stored in the PCM
Monitor the 5V reference to the Accelerator Pedal Position ( APP ) sensor, circuit 1274, using Peak Min/Max on a Fluke 87. Refer to Si document 1454678 for the 5V reference schematics. Command the fan clutch control "on" with the Tech 2 at 50%. If when commanding the fan clutch on, the 5V reverence spikes to battery voltage, the concern is the 5V reference shorted to battery voltage intermittently inside cooling fan clutch. Replace the fan clutch to repair this concern.
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.
(02 - 05 Chevrolet Trailblazer and Trailblazer EXT) and (02 - 05 GMC Envoy, Envoy XL and Envoy XUV ) and (02 - 05 Buick Rainier) and (02 - 04 Oldsmobile Bravada)
Posted on Jul 16, 2009
You will have to have a code reader,to purchase one now is cheap,at napa,I think it is 39 dollars right now ,or you can get auto zone to read them for free.
Posted on Jul 05, 2010
Don't see these too often, must of been a dealer or a good mechanic with some expensive equipment....
U1000 is loss of communication with an unknown module...could be any module like TCCM.
B1850 is Drivers Lumbar Horizontal sensor Circuit Malfunction...in your seat.
Y1160, I have no clue what this is.
I would take it to a mechanic that has a Tech II (or equivalant) diagnostic machine, this will pinpoint your problem with at least the U1000...will show which module is not communicating. Would be able to tell you what the Y1160 is also. Good luck!
Posted on Feb 15, 2011
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