Code error U1300 scanner
This code pertains to communication from one computer to the next,they all are on a communication circuit (class II) & you have a short to ground somewhere.If a scan tool is able to communicate with the computer(and it is since you got a failure code) this code is intermitten.Get a good volt meter or scan tool & start at the ALDL (where the scanner plugs in).Inspect & check wiring as you keep an eye on the scanner or meter.
DTC U1300 will set if the EBTCM, PCM, or SDM detected the Class II circuit in the low state for too long. (Class II circuit shorted to ground) when:
• Condition exists for longer than 4 seconds for EBTCM, 2 seconds for PCM and SDM.
• Ignition is On.
DTC U1300 diagnostic runs continuously with ignition On.
DTC U1300 is a type C DTC.
If the scan tool can communicate with the EBTCM, PCM or SDM, then the Class II link is not currently shorted to ground.
Inspect the wiring harness for signs of chafing or broken insulation.
Important: The controller name won't be displayed until the scan tool initially received the correct controller ID over the link upon ignition On.
Important: The BCM CANNOT set U1300.
To locate an intermittent problem, use the scan tool to monitor any of the controllers on the Class II link located under DIAGNOSTIC CIRCUIT CHECK - - - CLASS II MESSAGE MONITOR with ignition On, engine Off. INACTIVE will be displayed on all controllers if the link is shorted to ground.
Hope this helps (remember to rate this answer).
Jan 14, 2011 |
Chevrolet Impala Cars & Trucks