Standard U Codes

NOTE: The DTC U1073 can be generated by either the PCM or the EATC module, you must know which module is producing this code for proper testing.


For the DTC's below see A L L Diagnostic Trouble Codes ( DTC ). Testing and Inspection

U1020
U1021
U1039
U1051
U1073
U1135
U1256
U1451


The following DTC's are information codes generated by the Electronic Automatic Temperature Control (EATC) module. There is no testing for these codes, just descriptions.

For electrical diagrams refer to Heating and Air Conditioning. Heating and Air Conditioning

U1073 Engine Coolant Temp Invalid
U1341 Vehicle Speed Missing Message or Invalid Data